Developer tools that run in your browser

50 fast, focused utilities for JSON, encoding, hashing, dates and text. No accounts, no uploads, nothing to install.

Most used

JSON Formatter JSON Pretty-print, validate and minify JSON with syntax highlighting and precise error locations. JSON Validator JSON Check whether JSON is valid and get the exact line, column and cause of any syntax error. JSON Viewer JSON Explore large JSON as a collapsible tree, with search, type badges and copyable paths. Base64 Encoder Encoding Encode text or files to Base64, with URL-safe output and data URI generation. Base64 Decoder Encoding Decode Base64 back to text or download it as the original file. JWT Decoder Encoding Decode JWT header and payload, read claim timestamps in plain English, and optionally verify the signature. UUID Generator Generators Generate v4 and v7 UUIDs in bulk, with formatting options and one-click copy. Password Generator Generators Create strong random passwords or passphrases, with a real entropy estimate in bits.

Browse by category

JSON & Data 10 Format, validate and convert structured data Encoding & Decoding 10 Base64, URL, HTML entities, hex and JWT Generators 6 IDs, passwords, random data and placeholder text Hashing & Security 4 SHA-256, SHA-1, MD5 and HMAC signatures Date & Time 7 Timestamps, timezones, durations and cron Text Tools 8 Count, convert, clean, sort and compare text Web & Dev 5 Regex, HTTP status codes, colors, CSS and user agents

Nothing is uploaded

Every tool here runs as JavaScript in your own tab. The API response you paste, the token you decode and the password you generate never reach a FindTool server, because there is no server to reach.

No account, no limits

There is nothing to sign up for and no usage quota. Bookmark a tool, use it fifty times a day, and you will never see a login wall or a "upgrade to continue" prompt.

Built to stay fast

Pages are static HTML served from a CDN, with only the small amount of JavaScript a given tool actually needs. Most pages are interactive before a spinner would have had time to appear.