Encoders, formatters, hashes & network tools for devs
Base64/URL/HTML codecs, JSON formatter & validator, SHA/MD5 via SubtleCrypto, JWT decoder, UUID, regex tester, CIDR/subnet and formatters. Dev data never leaves the tab.
In-content · after first value section
Why DevUtility?
Base64Decode pages show one box; DevUtility gives encode+decode+validate+download, error locations, batch, and keyboard-first flows — all offline-capable.
FAQ
Is it free?
Yes — every tool is free with no signup and no credits.
Is my data uploaded?
No. Tools run locally in your browser; files never leave your device. Check DevTools → Network.
Does it work offline?
After the first visit the app shell is cached, so calculators and generators keep working offline.
Does it work on mobile?
Yes — touch-friendly, one-tap download, adaptive workers for weak devices.
How do you make money?
Clearly-labeled ads, spaced away from buttons. No paywall, no fake download buttons.
Guides
Base64 without tears (Unicode!) · JWTs: what decode proves and what it doesn't · CIDR notation in one page — practical, original explainers with examples.