10 free tools
Developer tools
Everyday utilities for developers: format and validate JSON, test regular expressions with highlighted matches, encode and decode Base64 and URLs, generate hashes and UUIDs, decode JWTs, explain cron schedules and design CSS gradients.
Everything runs locally in your browser, so API responses, tokens and config files are never sent to a server.
- Regex TesterTest regular expressions live, with highlighted matches, capture groups and replace.Popular
- JSON Formatter & ValidatorPretty-print, validate and minify JSON, with clear error locations.
- UUID GeneratorGenerate random UUID v4 or time-ordered v7 IDs, one or a thousand at a time.
- Base64 Encoder & DecoderEncode and decode Base64 text (UTF-8 safe), or turn files into data URIs.
- Hash GeneratorMD5, SHA-1, SHA-256 and SHA-512 hashes of text or files, and checksum checks.
- URL Encoder & DecoderPercent-encode or decode text for URLs, and break a URL into its parts.
- CSS Gradient GeneratorDesign linear, radial and conic gradients and copy the CSS, or save a PNG.
- JWT DecoderDecode a JSON Web Token’s header and payload, check expiry and verify HS256 signatures.
- Cron Expression GeneratorBuild or explain cron schedules in plain English, with the next run times.
- Bcrypt GeneratorHash a password with bcrypt, or check a password against a hash.Popular
Frequently asked questions
Is it safe to paste tokens and data here?
The tools run entirely in your browser and send nothing to a server. Still, avoid pasting live production secrets into any website.