Free Developer Tools
That Work Offline
AltUtils is a collection of 25+ essential utilities for developers, designers, and SEOs. Everything runs 100% locally in your browser. No servers, no tracking, instant results.ags — all running entirely in your browser. Nothing is ever uploaded to a server.
Offline First
Works without internet
100% Private
Data stays on your device
Instant
No server round-trips
No Tracking
Zero cookies or telemetry
Why AltUtils?
Most online tools upload your data to remote servers. AltUtils is different. Every tool runs 100% in your browser using modern Web APIs — your text, images, tokens, and passwords never leave your machine. It works offline, loads instantly, and is completely free.
All Tools
Browse by category or press / to search.
Text Mastery
Transform, clean, count, and encode text with precision.
Dev Core
Format, validate, decode, and hash — all client-side.
Visuals
Optimize images, generate favicons, and convert colors.
Web & SEO
Build meta tags, robots.txt, sitemaps, and redirect chains.
Daily Life
Everyday utilities — passwords, QR codes, units, and more.