Free Online Developer Tools

16 essential tools for your daily workflow. Everything runs in your browser — no data ever leaves your machine. No signup, no tracking, no server.

{} Format
JSON Formatter
Format, validate and minify JSON data instantly
🔑 Security
JWT Decoder
Decode and inspect JWT token header and payload
B64 Encode
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings
🔗 Encode
URL Encoder/Decoder
Encode and decode URL components and query strings
.* Test
Regex Tester
Test regular expressions with live match highlighting
⚙ Build
Visual Regex Builder
Build regex patterns visually with token-based interface
⏱ Convert
Unix Timestamp Converter
Convert between Unix epoch timestamps and human dates
⬤ Convert
Color Converter
Convert between HEX, RGB, and HSL color formats
MD Preview
Markdown Preview
Write Markdown and see rendered HTML output live
404 Reference
HTTP Status Codes
Searchable reference for all HTTP response codes
± Compare
Diff Checker
Compare two text blocks and highlight differences
🆔 Generate
UUID Generator
Generate UUID v4, v5, or bulk UUIDs instantly
⏰ Generate
Cron Expression Builder
Build cron schedules visually with next-run preview
📦 Analyze
package.json Analyzer
Analyze dependencies, scripts, versions, and project health
TS Generate
JSON to TypeScript + Zod
Generate TypeScript interfaces and Zod schemas from JSON
01 Convert
Number Base Converter
Convert between binary, octal, decimal, and hex

Developer Tools That Respect Your Privacy

Every tool on this site runs entirely in your web browser using JavaScript. No data is transmitted to any server. No accounts, no cookies, no analytics tracking. Built for developers who value speed and privacy.

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Built by PunamIDE

These tools are part of the PunamIDE developer ecosystem. PunamIDE is an AI-powered desktop IDE for Windows with built-in code intelligence, native snapshots, and technical debt analysis.