Developer Tools That Just Work
Free, fast, and private developer utilities. All tools run entirely in your browser — no data ever leaves your device.
Instant Results
No loading, no servers. Get results as you type.
100% Private
All processing happens locally in your browser.
Works Offline
Use these tools anytime, even without internet.
All Tools
JSON Formatter
Format, validate, and minify JSON
FormattersJWT Decoder
Decode and inspect JWT tokens
SecurityUUID Generator
Generate random UUIDs (v4)
GeneratorsBase64 Encoder/Decoder
Encode or decode Base64 strings
EncodersURL Encoder/Decoder
Encode or decode URL components
EncodersUnix Timestamp Converter
Convert between Unix timestamps and dates
Time ToolsToken Counter
Count tokens for AI models (GPT, Claude)
AI ToolsHash Generator
Generate MD5, SHA-1, SHA-256, and other hashes
SecurityBrowse by Category
Why DevToolkit?
Privacy First
Unlike many online tools, DevToolkit processes everything locally in your browser. Your data never leaves your device, making it safe to use with sensitive information like JWT tokens or API keys.
No Account Required
Just open any tool and start using it immediately. No sign-ups, no subscriptions, no tracking. Free forever.
Fast & Lightweight
Built with performance in mind. All tools provide instant feedback as you type, with no unnecessary bloat or slow server round-trips.
Open & Transparent
DevToolkit is built with well-known, audited libraries. You can inspect exactly how your data is being processed.