| If you want to… | Use this tool |
|---|---|
| Beautify, validate, minify and explore JSON with a tree view | Json formatter |
| Encode or decode Base64 text and files | Base64 encode |
| Percent-encode or decode URLs and parse query strings | Url encode |
| Minify JavaScript, CSS and HTML and see how much you saved | Minify js |
| Format messy HTML, CSS, JavaScript and SQL code | Code beautifier |
| Test regular expressions live with match highlighting and groups | Regex tester |
| Decode JWT tokens, check expiry and verify the signature | Jwt decoder |
| MD5, SHA-1, SHA-256, SHA-512 and HMAC for text and files | Hash generator |
| Generate UUID v4 / v7, GUIDs and NanoIDs in bulk | Uuid generator |
| Build and explain cron schedules and see the next run times | Cron expression generator |
| Convert images to Base64 data URIs | Image to base64 |
| HEX, RGB, HSL, CMYK converter with WCAG contrast checker | Color converter |
| Generate placeholder text: paragraphs, sentences, words or lists | Lorem ipsum generator |
| Convert Unix epoch time to date and date to timestamp | Unix timestamp converter |
14 free tools
Free Developer Tools
These free developer tools handle the small jobs you do every day. Format JSON, encode Base64, test regular expressions, decode JWTs, and generate hashes and UUIDs. Everything runs in your browser, so your data stays private.
Guide
Which developer tools should you use?
Pick the tool that matches the job. Each one is free and works in your browser.
FAQ
Free Developer Tools: common questions
Quick answers about our developer tools.
Is my code or data sent to a server?
No. These developer tools run in your browser with JavaScript, so the text you paste stays on your device.
Can I use these tools for work projects?
Yes. They are free for personal and commercial use. Because data stays in your browser, they are safe for most everyday work tasks.
Do the tools work offline?
Many of them keep working after the page has loaded, because the processing happens in your browser. A connection is only needed to open the page.
Which formats are supported?
Each tool lists what it supports. Common jobs include formatting JSON, Base64 and URL encoding, decoding JWTs, testing regular expressions and creating hashes and UUIDs.
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