Developer Tools

Free developer tools
that run in your browser.

A growing suite of fast, no-signup developer utilities. Format JSON, encode and decode Base64, work with URLs — all processed locally in your browser. No uploads, no accounts, no limits.

$ open devtools --free --no-signup --private
Skip the reading — browse all 17 free tools now, no signup.
Open the tools →
Available now

The toolkit

{ }
JSON Formatter & Validator
Beautify, minify, and validate JSON with syntax highlighting and precise error location. Reports key counts and size. Ideal for debugging API responses and editing config files.
Base64 Encoder & Decoder
Encode and decode Base64 live, with full UTF-8 support for emoji and every language. URL-safe variant for JWTs and tokens, with automatic padding repair.
%
URL Encoder & Decoder
Percent-encode text for safe use in URLs, or decode encoded URLs back to readable text. Handles query parameters, special characters, and full UTF-8.
#
Coming soon
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes of any text using the Web Crypto API — for verifying file integrity and data fingerprinting.
🔒 Why browser-based matters for developers. Developer data is sensitive — JWTs, API keys, Basic Auth headers, config secrets. Most online tools upload what you paste to their servers. Every tool here processes data entirely in your browser using native web APIs, so your tokens and credentials never leave your device. Open your network tab and watch: zero outgoing requests.

Free developer tools, without the trade-offs

Developers reach for small utilities constantly: format a JSON blob to read it, decode a Base64 token to see what is inside, encode a string for a URL. The problem with most online options is the trade-off they force — either create an account, tolerate ads and upsells, or upload your data to someone else's server to have it processed.

Virtual Text Tools removes that trade-off. Every tool runs as JavaScript in your own browser using native web APIs like JSON.parse, TextEncoder, and the Web Crypto API. There is no backend, no account, and nothing is transmitted. That makes these tools both instant — no server round trip — and private by default.

What's in the toolkit

JSON Formatter & Validator

The JSON formatter beautifies unreadable single-line JSON into clean, indented structure, or minifies it back down for production. It validates as you go, pointing to the exact position of any syntax error — trailing commas, missing quotes, unclosed brackets. Full walkthrough in the JSON formatter guide.

Base64 Encoder & Decoder

The Base64 tool encodes text to Base64 and decodes it back, with proper UTF-8 handling so emoji and non-Latin scripts round-trip correctly — something many tools built on raw btoa() get wrong. It includes a URL-safe variant for decoding JWTs and URL parameters. See the Base64 guide for the full explanation, including why Base64 is encoding and not encryption.

URL Encoder & Decoder

The URL encoder percent-encodes text so it is safe to drop into a URL, and decodes encoded URLs back to readable text. Useful whenever you are building query strings or inspecting links. More in the URL encoder guide.

More tools on the way

The developer toolkit is growing. A hash generator (MD5, SHA-1, SHA-256), a Unix timestamp converter, and a diff checker for comparing two blocks of text or code are planned next — all built the same way: free, no signup, processed entirely in your browser.

Open the developer toolkit

Free, no account, nothing uploaded. Jump straight into any tool.

Open all tools →

Frequently asked questions

Are these developer tools really free?

Yes — completely free, no account, no signup, no usage limits. Because everything runs in your browser there is no server cost, so there is nothing to charge for.

Is it safe to use online developer tools with sensitive data?

With most tools, no — they upload your data to be processed. These tools process everything locally in your browser, so your data never leaves your device. That makes them safe for sensitive material like auth tokens and credentials.

Do these tools work offline?

Once the page has loaded, yes. All processing is local JavaScript, so you can disconnect from the internet and the tools keep working.

What other tools does Virtual Text Tools offer?

Beyond developer tools, there is a full suite of text and image utilities — word and character counters, case converters, a QR generator, image conversion and compression, and more. See the full comparison of all the tools or browse every tool.