9 essential developer tools in your browser. No install. No signup. Just tools that work.
Everything a developer needs for everyday data wrangling, all running client-side in your browser.
Beautify, minify, and validate JSON instantly. Tree view, syntax highlighting, and error reporting.
Encode text or files to Base64 and decode Base64 strings back to their original form.
Paste a JSON Web Token and instantly see its decoded header, payload, and signature details.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input in real time.
Generate RFC 4122 compliant v4 UUIDs. Bulk generate, copy to clipboard with one click.
Write and test regular expressions with real-time match highlighting, group capture, and flag support.
Encode special characters for safe URLs or decode percent-encoded strings back to readable text.
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Compare two blocks of text side by side with highlighted additions, deletions, and changes.
DevTools Online is free and open source. If these tools save you time, consider buying me a coffee to keep development going.
Buy Me a Coffee