Developer Tools
Formatters, generators, converters, and other developer utilities.
Available Utilities
8JSON Formatter
Format and validate JSON instantly.
UUID Generator
Generate UUIDs instantly.
JWT Decoder
Decode, inspect, and verify JSON Web Tokens (JWT) instantly.
JWT Generator
Generate and sign JSON Web Tokens (JWT) client-side instantly.
Base64 Image Converter
Convert images and videos to Base64 strings, or decode Base64 data URLs back to viewable media and files instantly.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa instantly.
Time Zone Converter
Convert dates and times across multiple world time zones, calculate timezone offsets, and visualize cross-timezone meeting planners instantly.
URL Encoder / Decoder
Encode or decode strings to make them URL-safe. Instantly translates special characters into percent-encoding and back.
All Developer Tools on Jumpytools
Browse 8 free developer tools — all run 100% in your browser with no data sent to any server.
- JSON FormatterFormat and validate JSON instantly.
- UUID GeneratorGenerate UUIDs instantly.
- JWT DecoderDecode, inspect, and verify JSON Web Tokens (JWT) instantly.
- JWT GeneratorGenerate and sign JSON Web Tokens (JWT) client-side instantly.
- Base64 Image ConverterConvert images and videos to Base64 strings, or decode Base64 data URLs back to viewable media and files instantly.
- Timestamp ConverterConvert Unix timestamps to human-readable dates and vice versa instantly.
- Time Zone ConverterConvert dates and times across multiple world time zones, calculate timezone offsets, and visualize cross-timezone meeting planners instantly.
- URL Encoder / DecoderEncode or decode strings to make them URL-safe. Instantly translates special characters into percent-encoding and back.
About Developer Tools Utilities
Our developer tools suite provides essential client-side utilities for web developers, software engineers, and API designers. From JSON formatting and JWT decoding to UUID generation and Base64 conversion, every tool runs completely in your browser sandbox without sending any code or sensitive payload to remote servers.
Designed for speed and reliability, these utilities eliminate cold starts, server latency, and security concerns associated with backend formatters. Whether you are debugging REST APIs, encoding URL parameters, or inspecting timestamps, our utilities deliver instant results with zero network overhead.
Frequently Asked Questions
Are my API keys or tokens safe when using these developer tools?
Yes, 100%. All processing happens locally in your browser JavaScript engine. No data, headers, or tokens are transmitted to any external server.
Do these developer tools work offline?
Once loaded, most of our web utilities run entirely in browser memory and can function without an active internet connection.
Which formats and standards are supported?
Our developer tools adhere strictly to modern web standards including RFC 4122 (UUID), RFC 7519 (JWT), and standard ISO/POSIX timestamp formats.