What is ETH Unit Converter?
ETH Unit Converter is a free, browser-based tool in the Crypto & Finance Tools suite. Live two-way converter for Ethereum's unit hierarchy: Wei (10⁻¹⁸), Kilowei, Milliwei, Microether (Gwei), Milliether (Finney), and Ether. Essential for gas-price math and reading raw chain data.
The headline benefit: convert between wei, gwei, finney and ether — gas, balances and defi in one place.
Unlike most online tools that upload your file to a server, process it, and send it back, ETH Unit Converter runs entirely in your browser. Open DevTools → Network while using it and you'll see zero file-upload requests — only static assets (JavaScript, CSS, fonts) load. Your data never leaves your device.
Why use this eth unit converter?
Three reasons EasyFileKit's ETH Unit Converter stands out from the crowd:
- **Private by design** — all processing happens locally via JavaScript and WebAssembly. No server ever sees your input.
- **Instant** — no upload wait, no queue, no server round-trip. Results appear the moment you act.
- **Free & unlimited** — no accounts, no watermarks, no daily caps. Use it as many times as you like.
How to use ETH Unit Converter — step by step
Here's the complete walkthrough. Everything happens instantly in your browser:
- **Step 1.** Type a value into any of the unit fields (Wei, Gwei, Finney, Ether).
- **Step 2.** All other fields update instantly as you type.
- **Step 3.** Use the presets (1 Gwei, 21,000 gas, etc.) for common reference values.
- **Step 4.** Copy any value with the copy button next to its label.
That's it. No sign-up, no upload bar, no waiting. If something doesn't work as expected, check the FAQ below.
Common use cases for ETH Unit Converter
People reach for ETH Unit Converter in a few recurring situations:
- When you need the result **now** and can't wait for a server-based tool to upload, queue, and process your file.
- When your file is **private or sensitive** — financial documents, personal photos, medical PDFs — and you don't want it travelling across the internet.
- When you're on a **slow or metered connection** — uploading a 50 MB file just to compress it makes no sense when the same work can happen locally.
- When you've hit the **daily limit or paywall** on another "free" tool site.
Privacy: what actually happens to your data
This is the single most important point about ETH Unit Converter, so it deserves its own section.
When you use this tool, your input is processed by JavaScript running in your browser tab. The code is downloaded once (cached afterwards) and executes locally on your CPU. At no point is your file, your text, or your input data transmitted to any server.
You can verify this yourself in under 30 seconds:
- Open ETH Unit Converter in your browser.
- Press F12 to open DevTools.
- Switch to the Network tab and tick "Disable cache".
- Use the tool — drop a file, type text, whatever the tool needs.
- Watch the Network log. You'll see only static assets (JS, CSS, fonts, icons). No request contains your data.
This isn't a setting you toggle or a promise in a privacy policy — it's how the tool is architecturally built. There is no upload endpoint to call.
Frequently asked questions about ETH Unit Converter
Q: What is Wei?
A: Wei is the smallest unit of ether: 1 ETH = 10¹⁸ wei. It's named after Wei Dai, a cryptography pioneer. Smart contracts and the EVM always operate in wei under the hood.
Q: What is Gwei and why is it used for gas?
A: Gwei (giga-wei) = 10⁻⁹ ETH = 10⁹ wei. Gas prices are quoted in Gwei because typical transaction fees are in the tens-of-Gwei range, which reads more naturally than trillions of wei.
Q: What is Finney?
A: 1 Finney = 10⁻³ ETH = 1 milliether. Named after Hal Finney, the first person to receive a bitcoin transaction. It's rarely used today but still defined in the EVM.
Q: How do I compute a gas cost?
A: Gas cost (in ETH) = gas limit × gas price (in Gwei) ÷ 10⁹. For a standard 21,000-gas transfer at 20 Gwei: 21,000 × 20 ÷ 10⁹ = 0.00042 ETH.
Q: Does the converter support Ethers.js-style BigNumber?
A: Not directly — it converts decimal numbers. For very large or very small values, we use BigInt under the hood to avoid precision loss up to 2^53 wei.
Q: Are my conversions uploaded?
A: No. All math is local. There is zero network activity.
ETH Unit Converter: EasyFileKit vs server-based tools
Most "free" online tools that do what ETH Unit Converter does follow the same model: you upload your file to their server, they process it with a backend script, then they send the result back. Here's the honest comparison:
| | EasyFileKit | Server-based tools |
|---|---|---|
| **Your file leaves your device?** | Never | Yes, uploaded to a server |
| **Speed** | Instant (no upload) | Slower (upload + queue + download) |
| **Privacy** | Complete | Your file is on someone else's computer |
| **Cost** | Free, unlimited | Often capped or "premium" gated |
| **Works offline** | Yes (PWA) | No |
Server-based tools aren't evil — they exist because some tasks genuinely need heavy backend compute. But for everything ETH Unit Converter does, client-side processing is strictly better for you.
Under the hood: how ETH Unit Converter works
ETH Unit Converter is built with modern browser APIs. Depending on what it does, it may use:
- **Canvas API** — for image manipulation (pixel-level access, filters, resizing).
- **Web Crypto API** — native, hardware-accelerated cryptography (AES-GCM, SHA-256, PBKDF2) for any encryption or hashing.
- **pdf-lib / pdf.js** — fully client-side PDF creation and rendering.
- **MediaRecorder API** — for capturing screen, audio, and video.
- **WebAssembly** — for heavy codecs (image compression, media processing).
All of these run inside your browser's sandbox. They cannot access your filesystem (beyond files you explicitly choose), cannot make network requests with your data, and cannot run persistently in the background.
Pro tips for getting the most out of ETH Unit Converter
- **Bookmark the tool** — it works offline once cached, so you can use it even without a connection.
- **Install EasyFileKit as a PWA** — open the browser menu and choose "Install app" for a standalone window and offline access.
- **Use it on mobile** — every tool is fully responsive and works on phones and tablets, not just desktops.
- **No file size anxiety** — because nothing uploads, you can process large files that server-based tools would reject or charge for.
Try ETH Unit Converter now
The tool is right above this article — scroll up and start using it. No sign-up, no upload, no limits.
If you found ETH Unit Converter useful, explore the rest of the Crypto & Finance Tools suite — there are more tools that work the same private, instant, free way. And if you have a question that isn't covered in the FAQ above, the About page has our contact email.