All Tools (419)
Browse the complete EasyFileKit index — every tool, A to Z.
Add Page Numbers
Stamp page numbers onto every page of a PDF — pick position & start.
Add PDF Watermark
Stamp diagonal text watermarks across every PDF page — private.
Audio Trimmer
Slice audio precisely with start/end sliders — export WAV.
Arabic Tashkeel Remover
Strip Arabic diacritics (harakat) & optional tatweel — bilingual UI.
Arabic Transliteration
Convert Arabic script to Latin letters — Buckwalter-style mapping.
Age Calculator
Your exact age in years, months & days — plus a birthday countdown.
Aspect Ratio Calculator
Find the missing dimension for any aspect ratio.
Angle Converter
Convert between degrees, radians, gradians, arcminutes, and more.
Area Converter
Convert between m², ft², acres, hectares, and more.
Alarm Clock
Set an alarm that beeps, flashes and toasts — snooze included.
ARPU Calculator
Average Revenue Per User with annualized projection.
Alcohol Calories Calculator
Calories and units across 10 common drink types.
Age in Days Calculator
Your exact age in days, weeks, months and hours.
Age Difference Calculator
Exact gap in years, months, days and total days.
A Body Shape Index (ABSI)
Mortality risk from waist, BMI and height — independent of BMI.
Average Calculator
Mean, median, mode, sum, range — instant statistics for any list of numbers.
A/B Test Calculator
Compute conversion rates, lift, z-score, and p-value for A/B test results.
ATS Resume Scorer
Paste your resume and a job description — get a keyword alignment score.
APY ↔ APR Converter
Convert Annual Percentage Rate to Annual Percentage Yield and back — DeFi-grade precision.
Aim Trainer
Click targets as fast as you can — measures avg reaction, accuracy, and misses.
Bulk Image Resizer
Resize a batch of images to a max box and download them all as a ZIP.
Base64 to Image
Decode a base64 string or data URL back into a real image file.
Background Remover
Remove solid backgrounds from images with flood-fill — local.
Black & White Converter
Convert images to grayscale or 1-bit black & white.
Base64 Encode / Decode
Convert text to and from Base64 — Unicode-safe, no uploads.
bcrypt Hash Generator
Generate a bcrypt-format password hash — local, no uploads.
Box Shadow Generator
Tune x/y/blur/spread/opacity + color and copy clean CSS instantly.
Border Radius Generator
Drag sliders for each corner and copy clean border-radius CSS.
Barcode Generator
Create CODE128, EAN-13, UPC & CODE39 barcodes — instant PNG download.
BMI Calculator
Body Mass Index with metric or imperial units & category color coding.
BMR & TDEE Calculator
Daily calorie needs for maintenance, loss and gain — Mifflin-St Jeor.
Binary ↔ Text Converter
Decode binary to text or encode text to binary (UTF-8).
Budget Planner
Plan your monthly budget across 8 categories — see what's left.
Break-Even Calculator
Find the sales volume where revenue equals costs.
Burn Rate Calculator
Calculate monthly burn and runway from cash spent over time.
Bill Split Calculator
Split a bill between any number of people, with tip and tax.
Body Fat Calculator
U.S. Navy body fat formula from circumference measurements.
Blood Pressure Checker
Classify your BP reading using American Heart Association categories.
Business Name Generator
Combine prefixes, suffixes, and industry words into 24 name ideas.
Business Slogan Generator
Generate 12 slogan ideas in 4 tones — modern, classic, bold, playful.
Bitcoin Address Validator
Validate BTC addresses — Legacy (P2PKH), SegWit (P2SH), and Bech32 (Native SegWit + Taproot).
BIP39 Seed Phrase Validator
Check recovery phrases word-by-word against the BIP39 wordlist and verify the checksum.
Compress PDF
Re-pack a PDF to shrink its file size — local, private, instant.
Crop PDF
Set the visible crop box on every page with margin controls.
Compare PDF
Side-by-side text diff between two PDFs — local.
Circle Image Cropper
Crop any image into a circle with transparent corners — perfect for avatars and profile pictures.
Color Palette from Image
Extract dominant colors from any image — copy HEX or export CSS.
Color Blindness Simulator
Preview how your image looks to users with 8 color-vision deficiencies.
Change Video Speed
Speed up or slow down a video in your browser (0.5×–2×).
Case Converter
UPPER, lower, Title, Sentence, camelCase, snake_case & more.
CSS Minifier & Beautifier
Compress or re-indent CSS — instantly, locally.
Cron Expression Parser
Explain a 5-field cron expression and compute its next 5 runs.
CSV ↔ JSON Converter
Convert CSV to JSON and back — RFC 4180 compliant, no uploads.
Code Formatter
Beautify or minify JSON, CSS, HTML, SQL and XML in one tool.
CSP Builder
Build a Content-Security-Policy header with a clean UI.
Credit Card Validator
Luhn checksum + card type detection — 100% private.
chmod Calculator
Convert between octal (755) and symbolic (rwxr-xr-x) permissions.
curl Command Builder
Build a curl command from a friendly UI — shell-safe quoting.
Color Palette Generator
Pick a base color and instantly generate a 5-stop harmonious palette.
Color Converter
Convert HEX ↔ RGB ↔ HSL live with one click. No uploads.
Contrast Checker
Test foreground/background pairs against WCAG AA & AAA — live.
CSS Animation Generator
Build fade, slide, bounce, rotate & pulse animations — copy @keyframes live.
Clamp Calculator
Build fluid font sizes with clamp() and preview them across viewport widths.
CSS Grid Generator
Paint named grid areas visually and copy clean grid-template CSS.
Currency Formatter
Format any number as a currency — 18 currencies & compact notation.
Cooking Converter
Convert cups, tbsp, tsp, ml, fl oz, liters and grams (water-based).
Clothing Size Converter
Approximate clothing sizes across US, UK, EU, and letter systems.
Countdown Timer
Count down to any future date — days, hours, minutes, seconds.
Calendar Generator
Print or download a clean month calendar — Sunday or Monday start.
Compound Interest Calculator
See your money grow with compounding — daily, monthly, yearly.
Carbon Footprint Calculator
Estimate your annual CO₂ emissions from energy, transport, and flights.
Car Payment Calculator
Estimate monthly payment, total interest, and loan cost.
Commission Calculator
Compute commission earned on sales with base salary.
Cost of Living Index
Compare salaries needed across major world cities.
CAC Calculator
Customer Acquisition Cost — spend per new customer.
CPC Calculator
Cost per click, CPM, and CTR from ad spend and clicks.
CPM Calculator
Cost per 1,000 impressions for any ad campaign.
CTR Calculator
Click-through rate from impressions and clicks.
Conversion Rate Calculator
Visitor-to-customer conversion rate with revenue impact.
Churn Rate Calculator
Customer churn rate with annualized projection.
CLV Calculator (Customer Lifetime Value)
Estimate lifetime value per customer with LTV:CAC ratio.
Coin Flip
Flip a fair virtual coin with a 3D animation — heads or tails.
Calorie Calculator
Daily calorie needs using Mifflin-St Jeor — for loss, maintenance and gain.
Calorie Deficit Calculator
Plan a safe daily deficit to hit your weight loss goal on time.
Circle Calculator
Area, circumference, diameter — and 90° arc & sector — from radius.
Cover Letter Generator
Fill the form, get a polished 4-paragraph cover letter in 3 tones.
Crypto Tax Calculator
Compute capital gains P&L on crypto trades — FIFO, LIFO and HIFO methods.
Crypto Payment QR Generator
Generate a payment QR for BTC, ETH, SOL, LTC — copy-paste into any wallet.
Crypto Denomination Reference
Lookup table for BTC, ETH, SOL units — sats, gwei, lamports and more.
Cap Table Calculator
Build a capitalization table with founders, investors and an option pool.
Company Valuation Calculator
Estimate business value with revenue multiples, DCF and earnings multiples.
CPS Test
Click as fast as you can for 5–30 seconds — measures clicks per second.
Color Vision Test
Ishihara-style plates drawn on canvas — see if your color vision is normal.
Crossword Solver
Pattern-match against a built-in word list — fill in the blanks instantly.
Delete PDF Pages
Remove unwanted pages from a PDF using ranges like 1-3, 5.
Dominant Color Extractor
Find the top colours in an image and copy them as hex, CSS gradient or JSON array.
Dockerfile Generator
Generate multi-stage Dockerfiles for Node, Python, Go, Rust.
Date Difference Calculator
Days, weeks, months & years between two dates — instant.
DPI / PPI Calculator
Compute pixel density from resolution & diagonal — and reverse it.
Data Storage Converter
Convert between bit, byte, KB/KiB, MB/MiB, GB/GiB, TB/TiB.
Download Time Calculator
Estimate download time for any file size and connection speed.
Decimal to Fraction Converter
Find the closest simple fraction for any decimal.
Distance Converter
Convert length across mm, cm, m, km, in, ft, yd, mi, nmi, light-years.
Density Converter
Convert density across kg/m³, g/cm³, lb/ft³, lb/in³, and more.
Discount Calculator
Find the sale price — or reverse it back to the original. Any %.
Debt Payoff Calculator
Compare avalanche vs snowball methods and project debt-free date.
Down Payment Calculator
How long until you save enough to put down on a home?
Dice Roller
Roll 1–6 dice with d4, d6, d8, d10, d12, d20 or d100 sides.
Daily Protein Calculator
Protein target in g/kg/day by activity, age and goal.
Density Calculator
Solve density, mass or volume — ρ = m / V — for any two knowns.
Domain Name Generator
Suggest 100+ domain ideas from a keyword across 16 TLDs.
DCA Calculator
Simulate dollar-cost averaging into any asset — see total invested, units held, and average cost.
Dividend Yield Calculator
Compute dividend yield, annual income and DRIP projections for any holding.
Extract PDF Pages
Pull specific pages into a new PDF — keep only what you need.
Extract Text from PDF
Pull selectable text out of a PDF — copy or download .txt.
Edit PDF
Add text boxes to any page at chosen positions — local.
EXIF Viewer
Inspect the camera, lens, exposure, GPS and date tags embedded in a JPEG.
EXIF Remover
Strip EXIF, GPS, IPTC and XMP metadata from any image before sharing it.
Extract Audio
Pull the audio track out of any video as a WAV file — local only.
Email Validator
RFC 5322 format check — no DNS lookup, fully client-side.
Email / SMS / Phone QR
Turn an email, SMS or phone number into a one-tap QR code.
Energy Converter
Convert between joules, calories, kWh, BTU, and eV.
Expense Tracker
Track expenses with descriptions, amounts, and categories.
Emergency Fund Calculator
How much should you save for emergencies — and how long to get there?
Extra Mortgage Payment Calculator
See how extra payments slash interest and years off your mortgage.
Electricity Cost Calculator
Estimate running cost of any appliance by wattage and hours.
Encrypt & Decrypt Text
AES-GCM 256 encryption with a passphrase — round-trip in your browser.
Exercise Calorie Burn
Calories burned for 15+ activities using METs.
Exponential Growth Calculator
A = P · e^(rt) — population, bacteria, compound growth.
Email Signature Generator
Fill in your details, get a polished HTML signature with live preview.
Elevator Pitch Generator
Fill the form, get a structured 30-60 second pitch in 3 styles.
Ethereum Address Validator
Validate ETH addresses with full EIP-55 checksum verification — 100% in your browser.
ETH Unit Converter
Convert between Wei, Gwei, Finney and Ether — gas, balances and DeFi in one place.
Fill PDF Forms
Fill AcroForm text fields or overlay text at custom positions.
Favicon Generator
Turn one image into a complete favicon pack (16–512px) as a .zip.
Find & Replace
Replace text with optional regex & case-sensitive matching.
Fancy Text
Generate 𝓢𝓬𝓻𝓲𝓹𝓽, ⒮⒬⒰⒜⒭⒠, S̶T̶R̶I̶K̶E̶, 𝕓𝕝𝕒𝕔𝕜𝕓𝕠𝕒𝕣𝕕, ｆｕｌｌｗｉｄｔｈ & more.
Fake Data Generator
Generate fake JSON, CSV or SQL records for testing — 18 fields.
Font Pairing
Browse curated heading + body font pairings and copy the font-family stack.
Flexbox Playground
Tune flex-direction, justify, align, wrap & gap — copy container CSS live.
FAQ Schema Generator
Build FAQPage JSON-LD and earn expandable rich results in Google.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency and price.
File Size Converter
Convert between B, KB, MB, GB, TB & PB — 1024-based.
Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM, and angular units.
Fuel Economy Converter
Convert between MPG (US/UK), L/100km, and km/L.
FIRE Calculator
Find your FIRE number and how long until you can retire early.
File Checksum
Compute SHA-1, SHA-256 and SHA-512 for any file — locally, never uploaded.
Fibonacci Generator
Generate the first N Fibonacci numbers — arbitrary precision.
Flashcard Maker
Create, study, and flip flashcards — saved in your browser, no account needed.
GIF Maker
Build animated GIFs from a sequence of images — fully local.
Gradient Generator
Design CSS linear & radial gradients with up to 5 stops — copy-ready.
Glassmorphism Generator
Design frosted-glass cards with blur, tint and saturation — copy CSS.
GPA Calculator
Compute your grade point average on a 4.0 scale, weighted by credits.
GCF & LCM Calculator
Greatest common factor and least common multiple of any integers.
Grade Calculator
Weighted class grade from assignments, exams and categories.
HTML to PDF
Render simple HTML into a PDF via SVG foreignObject.
HEIC to JPG
Convert HEIC / HEIF photos from your iPhone to JPG — locally.
Hash Generator
Compute SHA-1, SHA-256 and SHA-512 hashes — locally.
HTML Entities Encode / Decode
Escape & unescape HTML entities — live, no uploads.
HMAC Generator
Compute HMAC-SHA-256/384/512 signatures — locally.
HTTP Status Codes Reference
Searchable reference of 60+ HTTP status codes — click to copy.
HTML to Markdown Converter
Convert HTML to clean Markdown via DOMParser — no regex hacks.
HTTP Headers Decoder
Parse and annotate raw HTTP headers — 60+ known headers.
HTML Heading Validator
Check h1–h6 structure for SEO — skips, multiple h1s, empty headings.
HowTo Schema Generator
Generate HowTo JSON-LD for step-by-step guides — copy-ready.
Hreflang Tag Generator
Build rel=alternate hreflang tags for international SEO — copy-ready.
Height Converter
Convert height between cm, m, ft, in — with feet-and-inches notation.
Hourly to Salary Calculator
Convert an hourly wage to annual, monthly, weekly, daily.
Hourly Rate Calculator
Find the rate to charge clients for your target income.
Heart Rate Zones
Five training zones via Karvonen or % of max HR.
Hydration Status Checker
Match urine color to a 6-shade hydration chart.
HRV Calculator
RMSSD, SDNN and pNN50 from RR intervals.
Hashtag Generator
Generate 15 niche-specific hashtags from a single keyword — no AI.
Images to PDF
Turn JPG, PNG, WebP & GIF images into a single PDF — locally.
Image Compressor
Shrink JPG, PNG & WebP files with a quality slider — private & instant.
Image Converter
Convert images between PNG, JPEG and WebP — no upload, no watermark.
Image Resizer
Resize images to exact pixel dimensions with optional aspect-ratio lock.
Image Filters
Apply grayscale, sepia, blur, brightness & more with live preview.
Image to Base64
Convert an image to a data URL for inline HTML, CSS or JSON.
Image Color Picker
Click any pixel to grab its hex and RGB color — with history.
Image Cropper
Drag a crop rectangle to crop your image to the perfect frame — free or locked to an aspect ratio.
Image Splitter
Slice an image into a 2×2, 3×3 or 4×4 grid and download the tiles as a .zip.
Image Watermark
Stamp a text or image watermark onto any picture — pick position, opacity, size.
Image Upscaler
Enlarge images 2×, 3× or 4× with high-quality smoothing.
Image to Text
Detect text regions inside an image — structural OCR preview.
Image Blur
Apply a true box blur to any image — adjustable radius.
Image Comparison Slider
Build before/after comparison images with an adjustable slider.
IP Subnet Calculator
Compute network, broadcast, mask and host range for IPv4 / IPv6.
ISBN Validator
Validate ISBN-10 and ISBN-13 checksums — mod 11 / mod 10.
IBAN Validator
Mod-97 checksum for International Bank Account Numbers.
Inflation Calculator
How much will today's money be worth in N years? Free, private.
Invoice Generator
Create clean invoices with line items, tax, and totals — export as text.
IRR Calculator
Internal Rate of Return — the discount rate that makes NPV = 0.
Ideal Weight Calculator
Four classic formulas — Devine, Hamwi, Robinson, Miller — plus frame adjustment.
Interview Question Generator
Curated question bank for 5 roles — behavioral, technical, and cultural fit.
Investment Growth Calculator
Project future value with regular contributions, growth rate, and compounding.
JSON Formatter
Beautify, minify and validate JSON — 100% in your browser.
JWT Decoder
Inspect JWT header and payload — no signature verification.
JSON to CSV
Convert an array of JSON objects into clean CSV — locally.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML back to JSON — no libraries.
JS Minifier & Beautifier
A conservative JS formatter — strip // comments, dedent, beautify.
JSON to TypeScript
Infer a TypeScript interface from any JSON sample.
JSON Schema Generator
Infer a draft-07 JSON Schema from a sample JSON object.
JSONL Formatter
Beautify, minify and convert JSON Lines — log-friendly.
JSONPath Tester
Evaluate JSONPath expressions against JSON — pure JS.
JSON-LD Builder
Build Schema.org JSON-LD snippets for rich results.
Job Description Generator
Pre-loaded templates for 5 common roles — fill in company details and post.
Lorem Ipsum Generator
Generate placeholder paragraphs — copy or download .txt.
Line Break Tool
Join lines or insert breaks every N chars / after each sentence.
llms.txt Generator
Generate an llms.txt file to guide LLMs to your docs.
Loan EMI Calculator
Calculate monthly EMI, total interest and payment — instant, private.
Lean Body Mass Calculator
LBM from Boer, James or Hume formulas.
Linear Regression Calculator
Fit y = mx + b to (x, y) data points — with R² correlation.
LinkedIn Headline Generator
Generate 15 recruiter-friendly headlines from your professional details.
Merge PDF
Combine multiple PDF files into one — free, private, instant.
Meme Generator
Add classic top-and-bottom Impact captions to any image — live preview, free download.
Mute Video
Strip the audio from a video and keep just the picture.
Markdown Preview
Write Markdown and see the rendered HTML live — side by side.
My IP Address
See your public IPv4, IPv6 and WebRTC-discovered IP.
Media Query Generator
Scaffold @media blocks for mobile, tablet & desktop with one click.
Meta Tag Generator
Generate title, description, OG and Twitter meta tags — copy-ready HTML.
Multi-Calendar Converter
Convert any Gregorian date to Hijri & Persian (Jalali) — instant, private.
Mortgage Calculator
Home price → monthly payment, total interest & full breakdown.
Markup Calculator
Find the selling price from cost and markup percentage.
MRR Calculator
Compute net new MRR and growth from monthly movements.
Meeting Cost Calculator
How much does this meeting actually cost?
Macro Calculator
Protein, carbs and fat targets from your daily calories.
Menstrual Cycle Calculator
Next 6 periods, ovulation dates and fertile windows.
Molar Mass Calculator
Compute the molar mass of any chemical formula — H₂O, NaCl, C₆H₁₂O₆…
Matrix Calculator
Add, subtract, multiply and find determinants of 2×2 and 3×3 matrices.
Multiplication Table Generator
Generate an N×N multiplication table — with hover highlight & CSV.
Memory Test (Simon)
Watch the lit-up sequence, then repeat it back — each round adds one more.
Number to Words
Convert any number to English words — supports negatives & decimals.
Number Base Converter
Convert between binary, octal, decimal & hex — BigInt-powered.
nginx Config Generator
Generate nginx server blocks — static, SPA, proxy, PHP-FPM, HTTPS.
Neumorphism Generator
Design soft dual-shadow neumorphic elements — copy CSS instantly.
Net Worth Calculator
Assets minus liabilities — your true financial position.
NPV Calculator
Net Present Value of an investment with cash flows and discount rate.
NPS Calculator
Net Promoter Score from promoter, passive, detractor counts.
Number Memory Test
Memorize a number, type it back — each level adds one more digit.
PDF Metadata Editor
View and edit PDF title, author, subject & keywords — locally.
PDF to Images
Render every PDF page to a PNG — pick scale, download a ZIP.
Protect PDF (ZIP)
Bundle your PDF into a password-protected ZIP — local.
PDF Reader
Open any PDF and read it page-by-page — right in your browser, no upload.
PDF to JPG
Convert each PDF page to a JPG image — zipped for easy download.
PDF to Text
Extract all text from a PDF into a single .txt file — local.
PDF to Word
Extract text from a PDF and package it as a .docx file.
PDF Page Resizer
Change PDF page size to A4, Letter, A3 or A5 — local.
PDF Repair
Re-save a broken PDF with a fresh xref table — local.
PDF Header & Footer
Add custom headers and footers with {page}/{total} placeholders.
PDF Image Stamp
Stamp a PNG/JPG image onto every PDF page — local.
PDF Bates Numbering
Apply Bates labels (CASE-000001) for legal document production.
PDF Page Border
Add a rectangular border to every page — color, width, margin.
PDF QR Stamp
Embed a QR code on every page of a PDF — local.
PDF Form Flattener
Bake form field values into the page content — no longer editable.
PDF to Markdown
Convert PDF text to Markdown with inferred headings & lists.
PDF Booklet Maker
Re-order PDF pages for booklet printing (fold + staple).
PDF Table to CSV
Reconstruct tables from a text-based PDF into CSV — local.
PDF N-Up
Place 2/4/6/9/16 source pages onto each output page.
Placeholder Image Generator
Generate dev-ready placeholder PNGs with custom size, colours and label.
PNG to ICO
Generate multi-resolution .ico files from PNG — for favicons & Windows.
Photo Editor
All-in-one photo editor: brightness, contrast, saturation & 7 presets.
Photo Collage Maker
Combine up to 9 photos into a grid, strip or stack — local.
Percentage Calculator
Three common percentage calculations — instant & private.
Pressure Converter
Convert between Pa, bar, atm, psi, torr, and more.
Pomodoro Timer
Focus 25 / break 5 / long break 15 — configurable productivity timer.
Paycheck Calculator
Estimate take-home pay after federal, state, and FICA taxes.
Payroll Calculator
Calculate gross, tax, and net payroll for multiple employees.
Profit Margin Calculator
Calculate profit margin and markup from revenue and cost.
Payback Period Calculator
How long until an investment pays for itself.
Password Generator
Strong random passwords generated locally with crypto.getRandomValues.
Passphrase Generator
Memorable multi-word passphrases — easier to type, harder to crack.
Password Strength Checker
Estimate entropy and crack time for any password — fully offline.
Pregnancy Due Date Calculator
Estimated due date via Naegele's rule or IVF/ultrasound.
Pregnancy Weight Gain Calculator
IOM-recommended weight gain by BMI category and gestational age.
Projectile Motion Calculator
Range, max height, time of flight — for any launch angle and velocity.
Percentage Change Calculator
Percent increase or decrease between two values — with multiplier.
Pythagorean Theorem Calculator
a² + b² = c² — solve for any side of a right triangle.
Permutation & Combination Calculator
Compute nPr and nCr — order matters, or it doesn't.
Probability Calculator
P(A), P(A∪B), P(A∩B) — single and joint event probability.
Prime Number Checker
Is a number prime? Instant yes/no with factor if composite.
Prime Number Generator
List the first N primes — or primes up to a limit.
Prime Factorization Calculator
Break any integer into its prime factors — 2² × 3 × 5, etc.
pH Calculator
pH from [H⁺] and reverse — with pOH, [OH⁻] and temperature.
Performance Review Generator
Three rating templates with strengths, improvements, and goals — fill in details.
Portfolio Rebalancer
Compute exact buys and sells to reach your target asset allocation.
QR Code Generator
Turn any text or URL into a downloadable QR code — free & private.
QR Code with Logo
Brand your QR code by embedding a logo in the center — still scannable.
QR Code Reader
Scan a QR code with your camera or upload an image — 100% private.
Quadratic Equation Solver
Solve ax² + bx + c = 0 — real and complex roots, with discriminant.
Rotate PDF
Rotate every page in a PDF by 90°, 180° or 270° — no upload.
Reorder PDF Pages
Drag-and-drop to rearrange PDF pages — no upload.
Redact PDF
Black out sensitive areas by placing rectangles on pages.
Rotate & Flip Image
Rotate by 90/180/270° and flip horizontally or vertically — live preview.
Remove Duplicate Lines
Dedupe a list of lines — case-sensitive or trimmed options.
Reverse Text
Reverse characters, words or lines — instantly.
Remove Extra Spaces
Collapse runs of spaces, trim line ends, drop blank lines — live.
Repeat Text
Repeat any text N times with a custom separator — copy & download.
Regex Tester
Test JavaScript regex with live match highlighting & groups.
README Generator
Generate a polished README.md from a few inputs — copy or download.
Random Number Generator
Cryptographically-secure random integers — unbiased, local.
Robots.txt Generator
Build a robots.txt with allow/disallow rules, sitemap & crawl-delay.
Ratio Calculator
Solve the missing side of a ratio, or simplify it with GCD.
Roman Numerals Converter
Convert decimal ↔ Roman (1–3999) — two-way, validated.
Ring Size Converter
Diameter or circumference → US, UK, EU and ISO ring sizes.
Retirement Calculator
Project your retirement nest egg with monthly contributions.
Refinance Calculator
Compare old vs new mortgage — see monthly savings and break-even.
ROI Calculator
Total and annualized return on any investment.
ROAS Calculator
Return on Ad Spend — revenue earned per dollar of ads.
Random PIN Generator
Generate numeric PINs of any length with optional unique digits.
Random Name Picker
Draw a random name from your list — optionally remove winners.
Random Number Generator
Generate cryptographically random integers — unique or repeating.
Random Color Generator
Generate random colors with hex, RGB & HSL — plus 5-color palettes.
Random Team Generator
Shuffle a list of names into balanced teams — fair & instant.
Rock Paper Scissors
Play rock-paper-scissors against the computer — track your win rate.
Random Emoji
Pick a random emoji from ~80 common characters — copy instantly.
Running Pace Calculator
Pace per km/mile and speed from distance and finish time.
Resting Heart Rate Checker
RHR fitness rating with reference ranges by age.
Resistor Color Code Calculator
Decode 4-band resistors from colors — and reverse value → colors.
Resume Generator
Fill the form, get a formatted plain-text resume with sections and bullets.
Resume Gap Analyzer
List your roles with dates — instantly detect employment gaps to explain.
Reaction Time Test
Wait for green, click as fast as you can — measures reflexes in milliseconds.
Split PDF
Split a PDF into individual pages or chunks — downloads a ZIP.
Scan to PDF
Capture pages from your camera and build a PDF — local.
SVG to PNG
Rasterize an SVG file to a crisp PNG, JPEG or WebP at any scale.
Screen Recorder
Record your screen (and mic) entirely in your browser — no installs.
Sort Lines
Alphabetize, sort by length, shuffle or reverse any list.
SQL Formatter
Beautify SQL with uppercase keywords & sensible line breaks.
String Escape / Unescape
Escape strings for JS, HTML, CSS, JSON, regex, URL and shell.
SSH Key Generator
Generate an RSA keypair via Web Crypto — SPKI / PKCS#8 PEM.
Script Generator
Pre-built bash, PowerShell, Python, Node and git scripts.
SERP Preview
See exactly how your page title & description render in Google.
Scientific Calculator
A real working calculator: functions, constants, memory & percent.
Statistics Calculator
Mean, median, mode, std deviation & more from a list of numbers.
Speed Calculator
Solve speed, distance or time from the other two — km/h, m/s, mph.
Shoe Size Converter
Convert adult shoe sizes between US, EU, UK and centimeters.
Screen Size Calculator
Compute PPI, physical dimensions, and area from resolution + diagonal.
Scientific Notation Converter
Convert between decimal, scientific, and E-notation.
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s, and Mach.
Stopwatch
Accurate stopwatch with laps — centisecond precision, no uploads.
Simple Interest Calculator
Compute simple interest: SI = P × R × T / 100 — fast, free, private.
Savings Goal Calculator
How long until you reach your savings goal — with interest.
Salary Calculator
Convert between annual, monthly, bi-weekly, weekly, daily, hourly.
SaaS Metrics Calculator
Quick SaaS snapshot: ARR, LTV, and 12-month MRR projection.
Startup Runway Calculator
Months of cash remaining at current burn — with growth option.
Secure Notes
A local-only encrypted notepad — passphrase-locked with AES-GCM 256.
SSL Certificate Decoder
Decode a PEM certificate into subject, issuer, validity and serial — locally.
Steps to Calories Calculator
Estimate calories burned from your daily step count.
Sleep Calculator
Bedtimes or wake-up times aligned with 90-minute sleep cycles.
Sleep Cycle Calculator
Live wake-up windows from your current bedtime.
Sample Size Calculator
Find out how many respondents you need using Cochran's formula.
Startup Name Generator
Coin modern startup names — vowel swaps, suffix mashups, compounds.
Satoshi ↔ BTC Converter
Convert satoshis to bitcoin and back with millisecond precision — the sats standard.
Staking Rewards Calculator
Project staking yield over time — daily, weekly, monthly compounding with restake modeling.
Stock Profit Calculator
Compute profit, ROI and break-even on any stock trade — including commissions.
Startup Equity Calculator
Estimate the value of your employee stock options after dilution and exit.
Sudoku Solver
Enter a 9×9 puzzle and watch backtracking solve it instantly — with conflict detection.
Scrabble Word Finder
Enter your letter rack — see every playable word sorted by Scrabble score.
Text Diff
Compare two texts line-by-line — added/removed highlighted.
Text to Slug
URL-friendly slugs from any title — accent-stripping included.
Text Statistics
Flesch Reading Ease, Flesch-Kincaid Grade & readability metrics.
Text ↔ Binary Converter
Convert text to binary and back — UTF-8 safe.
Truth Table Generator
Generate a truth table for any boolean expression.
TOML ↔ JSON Converter
Convert TOML to JSON and back — pure JS, no deps.
Twitter Card Preview
Preview your Twitter card and generate twitter:* meta tags.
Title/Description Pixel-Width Checker
Measure the real pixel width of your title & meta description — beat Google truncation.
Timezone Converter
See one instant across the world's major timezones.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
Tip Calculator
Split the bill and tip fairly — quick percentages, per-person total.
Tax Calculator
Add or remove sales tax from any amount — any rate.
Triangle Calculator
Area (Heron's), perimeter and angles from three sides.
Typing Speed Test
Measure your words-per-minute with a live paragraph and accuracy tracking.
Unlock PDF
Remove owner-password permission restrictions from a PDF — local.
URL Encode / Decode
Percent-encode or decode URLs and query strings — locally.
UUID Generator
Generate cryptographically-secure UUID v4s — bulk & instant.
Username Generator
Generate memorable usernames — adjective+noun, leetspeak, full names.
UTM Link Builder
Tag URLs with utm_source/medium/campaign and track every click.
Unit Converter
Length, weight, temperature, area, volume & speed — all in one.
Unix Timestamp Converter
Convert Unix timestamps to dates and back — live, two-way, private.
Unit Economics Calculator
Per-unit LTV, CAC payback, and LTV:CAC ratio.
Video to GIF
Turn a short clip into an animated GIF — fully in-browser.
Viewport Inspector
Live viewport size, DPR, orientation and Tailwind breakpoints.
vCard QR Code
Hand out your contact info as a scannable QR — instant address book.
Volume Converter
Convert volume across metric, US, and UK liquid units.
VAT / Tax Calculator
Add VAT to a net amount or strip it from a gross — any rate.
Vitamin D Calculator
Estimate vitamin D production from sun exposure.
VO₂max Calculator
Aerobic capacity from Cooper 12-min run or resting HR.
Word to PDF
Convert .docx / .txt / .md files to a basic PDF — locally.
WebP to JPG
Convert WebP images to JPG with an adjustable quality slider.
WebP to PNG
Convert WebP images to PNG with full transparency preserved.
Word Counter
Live word, character, sentence & reading-time stats — private.
WiFi QR Code
Share your WiFi instantly — guests scan to connect, no typing.
Weight Converter
Convert mass across mg, g, kg, t, oz, lb, stone, US and UK tons.
World Clock
Live time in New York, London, Dubai, Tokyo, Sydney & your city.
Week Number Calculator
Get the ISO 8601 week number for any date — live, accurate, private.
Workday Calculator
Count working days between two dates — exclude weekends & holidays.
Wedding Budget Calculator
Allocate your wedding budget across 8 categories.
Wheel Spinner
Spin a colorful wheel to pick a random winner — fair & instant.
Water Intake Calculator
Daily water needs from weight, activity, climate and special states.
Workout Plan Generator
Personalized plan by goal, level and weekly frequency.
Waist-to-Hip Ratio Calculator
Abdominal fat distribution and cardiovascular risk.
Word Search Game
Generate a fresh word search puzzle — drag to find 10 hidden words.