Free · No signup · 100% client-side
Tiny tools that never leave your browser
Format, encode, convert, generate — six fast utilities for developers and the terminally curious. Everything runs locally; your data is never uploaded.
All tools
// 09JSON Formatter
Beautify, validate and minify JSON with instant error detection.
→ 02Base64 Encode / Decode
Convert text to Base64 and back — full UTF-8 support.
→ 03URL Encoder / Decoder
Percent-encode URLs or decode them, whole URI or one component.
→ 04Timestamp Converter
Unix time ↔ human dates, live clock, seconds & milliseconds.
→ 05QR Code Generator
QR codes for links, text, email, WiFi — download as PNG.
→ 06Hash Generator
SHA-1 / 256 / 384 / 512 digests via the Web Crypto API.
→ 07Regex Tester
Live regex matching with highlights, indexes and capture groups.
→ 08JWT Decoder
Unpack header, payload and claims of any JSON Web Token.
→ 09UUID Generator
Bulk v4 UUIDs from your browser’s cryptographic RNG.
→Why TmpIO?
TmpIO is a growing shelf of small, sharp utilities for developers, designers and everyone who moves data around. Every tool runs entirely in your browser — no accounts, no uploads, no waiting. Open a tool, paste, get your answer, move on.