Free Developer Tools
Most development work involves small chores that are too minor for a dedicated app but too fiddly to do by hand: pretty-printing a minified API response, checking why a regex refuses to match, or comparing two config files to spot the line that changed. These tools cover those moments in a single browser tab, with no sign-up and no extensions to install.
Paste a payload into the JSON formatter to validate and indent it, test patterns against sample text with live highlighting, or diff two snippets side by side. Decode a Base64 token or a percent-encoded query string, generate SHA hashes to verify a download, and create UUIDs for test fixtures. Convert Unix timestamps from logs into readable dates, turn a CSV export into JSON for a quick script, render Markdown to HTML, and translate design colors from HEX to RGB. Placeholder text and strong passwords are one click away when you are wiring up a prototype or seeding a staging database.
Format & validate
Encode & decode
Convert
- Timestamp ConverterTurns Unix timestamps from logs and databases into readable dates, and dates back into timestamps.
- CSV to JSON ConverterConverts a spreadsheet export into JSON for a seed file, fixture or quick script.
- Markdown to HTMLPreviews README or docs Markdown and gives you the HTML output.
- HEX to RGB ConverterTranslates design hex colors into RGB values for CSS or canvas code.
Generate
Frequently asked questions
- Is the data I paste sent to a server?
- The formatters, encoders, hashers and converters run in your browser, so pasted text stays on your device.
- Which hash algorithms are supported?
- The hash generator produces common SHA digests using the browser's built-in cryptography, which is handy for checking file or string integrity.
- Can I generate many UUIDs or passwords at once?
- Yes. Pro members can use bulk mode to create up to 100 at a time; single values are always free.