Developer Tools
Fast, private developer utilities that run entirely in your browser — nothing you paste ever leaves your device.
Developer Tools
JSON Formatter
Paste JSON to format it with clean indentation, minify it, or validate syntax. Free online JSON formatter that runs 100% in your browser — nothing is uploaded.
Developer Tools
JSON Validator
Check whether your JSON is valid in seconds. Paste any JSON to validate its syntax and see the exact error and character position when something is wrong.
Developer Tools
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text with correct Unicode support. Free online Base64 encoder-decoder that runs entirely in your browser.
Developer Tools
JWT Decoder
Decode any JWT to read its header and payload claims instantly, with expiry warnings. Free online JWT decoder — runs in your browser, never verifies signatures.
Developer Tools
UUID Generator
Generate random RFC 4122 version-4 UUIDs in bulk with secure randomness. Create 1 to 50 unique identifiers at once and copy them individually or all together.
Developer Tools
Password Generator
Create strong random passwords with custom length and character sets. Free generator using secure randomness — built in your browser, never sent anywhere.
Developer Tools
URL Encoder & Decoder
Encode or decode URLs and query parameters, with encodeURI vs encodeURIComponent explained. Free URL encoder-decoder that works instantly in your browser.