Every developer tool you need. One beautiful place.
17 fast, free tools that run entirely in your browser. No sign-ups, no uploads, no limits.
JSON Formatter
Format, validate and minify JSON with configurable indentation.
JWT Decoder
Decode JWT tokens and inspect header, payload and expiry claims safely in your browser.
Regex Tester
Test regular expressions live with match highlighting, capture groups and flags.
Base64 Encoder / Decoder
Encode and decode Base64 text with full Unicode support.
SQL Formatter
Pretty-print SQL for PostgreSQL, MySQL, SQLite, T-SQL and more.
Timestamp Converter
Convert Unix timestamps to human dates and back, with a live epoch clock.
UUID Generator
Generate cryptographically secure UUID v4 identifiers in bulk.
Markdown Previewer
Write Markdown and see a sanitized live preview side by side.
Diff Checker
Compare two texts line by line and highlight additions and deletions.
Cron Parser
Explain cron expressions in plain English and preview the next scheduled runs.
Hash Generator
Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes instantly.
Color Converter
Convert colors between HEX, RGB and HSL with instant shade palette.
URL Encoder / Decoder
Encode and decode URLs and URI components, with percent-encoding control.
HTML Entities
Escape and unescape HTML entities, including numeric character references.
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences or words for mockups.
Image Compressor
Compress and resize images locally in your browser — nothing is uploaded.
Privacy first
Every tool runs 100% client-side. Your tokens, data and images never touch a server.
Blazingly fast
Statically generated pages with zero backend. Tools open instantly and work offline.
Built by everyone
Adding a tool is one component plus one registry entry. First PR friendly by design.
Have an idea for a tool?
DevKit grows through community contributions. Ship your favorite utility in under an hour — no framework expertise required.