All the developer tools
you reach for daily.
40 utilities for JSON, encoding, auth, and more. Runs 100% in your browser. No accounts, no data collection, no rate limits.
Why Developer Toolkit
Built differently.
Privacy by architecture
No server ever processes your input. No database stores your payloads. Your API keys, tokens, and production data stay on your machine. The privacy guarantee is structural, not a policy.
Zero friction, always
No sign-up. No paywall. No rate limits. Open the tool, paste your input, get output. That is the entire experience. Nothing in the way when you need a quick decode at 2am.
Built for developers
Keyboard shortcuts on every tool. CodeMirror editor for input quality. Warnings for BigInt precision loss, duplicate JSON keys, and the edge cases that generic tools miss entirely.
Most used
Start with the essentials.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON. Detects BigInt precision issues, duplicate keys, and JSONC comments.
Base64 Encoder / Decoder
Encode or decode Base64 strings instantly. Supports standard and URL-safe variants.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and signature without a secret.
UUID / ULID Generator
Generate RFC-4122 UUIDs (v1, v4, v5) and ULIDs instantly.
SQL Formatter
Format and beautify SQL queries for MySQL, PostgreSQL, SQLite, T-SQL, and Standard SQL. Keyword casing control.
Regex Tester
Test and debug regular expressions with real-time match highlighting.
Browse by category
Find the right tool fast.
JSON
Format, validate, and diff your JSON data.
Encoding
Base64, URL encoding, and image conversion.
Auth
Decode and generate JWT tokens.
Generators
UUIDs, passwords, hashes, QR codes, Lorem Ipsum.
Converters
Timestamps, colors, number bases, and YAML.
Text and Diff
Regex, diffs, Markdown, word counting, and more.
Formatters
SQL formatter, cron builder, and Notepad.
Get started
40 tools. All free. No sign-up.
Everything you need for JSON, encoding, auth, text, and more. Open a tool and start immediately.