Web & Dev
UUID Generator
Generate v4 UUIDs in bulk with copy-to-clipboard and format options.
Browser-based Open Tool
100% Client-Side & Private — No Data Sent to Servers
Utility Tools — Free Online Developer & Designer Tools
Fast, free, privacy-friendly online developer tools that run directly in your web browser. 41 tools for formatting JSON, converting data, manipulating images, and editing text.
Web & Dev Tools(9 total)
Web & Dev
Timestamp Converter
Convert Unix timestamps to human-readable dates and back, with timezone support.
Browser-based Open Tool
Web & Dev
JWT Decoder
Decode JWT header, payload, and expiry information.
Browser-based Open Tool
Web & Dev
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes from text.
Browser-based Open Tool
Web & Dev
CSS Unit Converter
Convert between px, rem, em, and % units.
Browser-based Open Tool
Web & Dev
Cron Expression Parser
Parse cron expressions into human-readable descriptions.
Browser-based Open Tool
Web & Dev
Meta Tag / OG Previewer
Preview how your site looks in social cards and search results.
Browser-based Open Tool
Web & Dev
HTTP Status Code Reference
A searchable reference of all HTTP status codes with meanings.
Browser-based Open Tool
Web & Dev
Number Base Converter
Convert numbers between binary, hex, decimal, and octal.
Browser-based Open Tool
Why Choose Our Free Online Developer Utility Tools?
At utilitiestools.net, we provide a complete suite of fast, reliable, and privacy-first online developer tools engineered specifically for modern software engineers, web developers, content creators, and UI/UX designers. Every single utility tool in our collection operates 100% locally inside your web browser using WebAssembly and client-side JavaScript APIs. Your data, source code, API keys, JSON payloads, and uploaded media files are never transmitted to external remote servers, ensuring maximum privacy and data security.
JSON & Data Tools
Format, minify, validate, and convert JSON payloads instantly with interactive collapsible tree views, color syntax highlighting, and fast error diagnostics.
Text & Formatting Tools
Clean, transform, diff, encode, and decode text instantly. Includes Base64 converters, URL encoders, word counters, line sorting tools, and case converters.
Image & PDF Tools
Compress, resize, merge, and split PDF documents and images locally without quality degradation or server upload wait times.