Free Online Developer Tools

Fast, private, no signup. All tools run in your browser — your data never leaves your device.

Data

Format, validate, and beautify JSON data instantly

Generate random UUIDs (v4) instantly

Encode and decode Base64 strings instantly

Encode and decode URL strings

Count words, characters, sentences, and paragraphs

Convert text between UPPER, lower, Title, and more

Generate placeholder text for your designs

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Test and debug regular expressions with live matching

Convert colors between HEX, RGB, HSL formats

🔒 Privacy First — All processing happens in your browser. We never upload, store, or log your data.
⚡ Instant — No server round-trips. Tools respond instantly, even offline.
🆓 Free Forever — No signup, no limits, no paywalls. Just tools that work.
📱 Mobile Ready — Responsive design works on any device.