Online Dev Tool – Free Online Developer Utilities
Format, Convert, Encode, Decode & Debug Easily. All tools run entirely in your browser — no data leaves your machine.
Popular Tools
View allJSON Formatter
Format, validate, and minify JSON data instantly.
Base64 Encode / Decode
Encode or decode Base64 strings online.
URL Encode / Decode
Encode or decode URL components.
Timestamp Converter
Convert Unix timestamps to human-readable dates.
UUID Generator
Generate UUID v1 (time-based), v4 (random), or v7 (sortable) — up to 100 at once.
JWT Toolkit
Decode, sign, and verify JSON Web Tokens. Inspect header and payload, generate signed tokens with HS256/HS384/HS512, and verify signatures. 100% client-side.
QR Code Generator
Generate QR codes for URLs, text, WiFi, and contacts. Customize colors and download as PNG.
SQL Formatter
Format and beautify SQL queries with configurable keyword casing, indentation, and dialect support for MySQL, PostgreSQL, T-SQL, BigQuery, Snowflake, and 15+ more.
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