Free, beautiful tools for everyone
A free collection of polished, browser-based utilities for everyday tasks. Format JSON, fix syntax errors, compare diffs, convert data, and more — instantly, with no sign-up or installs.
JSON Tools
4JSON Formatter
Format and beautify your JSON data with proper indentation. Supports syntax highlighting, folding, and search.
JSON Fixer
Automatically fix common JSON errors like trailing commas, missing quotes, and invalid syntax.
JSON to Table
Convert JSON data (including nested objects) into a beautiful tabular format. Supports sorting, drag-and-drop reordering, and column hiding.
JSON Diff
Compare two JSON strings side-by-side with inline diff highlighting. Optionally format before comparing to ignore whitespace differences.
Encode / Decode
4Base64 Encoder
Encode text, files and images to Base64 instantly. Supports UTF-8, GBK, URL-safe format, and image preview.
Base64 Decoder
Decode Base64 strings back to text, files and images instantly. Supports multiple charsets and image preview.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload and claims. Optionally verify the signature with your secret or public key.
JWT Encoder
Create and sign JSON Web Tokens (JWT). Supports HS256, RS256, ES256, EdDSA and more. All signing runs in your browser via the Web Crypto API.
URL Encoder / Decoder
SQL Tools
2SQL Formatter
Format and beautify SQL queries with proper indentation and keyword casing. Supports MySQL, PostgreSQL, SQLite, T-SQL, BigQuery. Includes one-click minify and copy.
MyBatis Log Formatter
Convert MyBatis debug logs into executable SQL by merging Preparing and Parameters lines. Supports all common Java types and formats the resulting SQL.