15 browser-based dev tools I use daily — no login, nothing uploaded

aassad — Tue, 07 Jul 2026 09:59:00 +0000

Like most developers, I have a handful of small utilities I reach for every
day — formatting JSON, decoding a JWT, generating a UUID, testing a regex.

For years I just googled "json formatter" and pasted my data into whatever
site came up first. Then one day I caught myself pasting a production JWT
into a random online parser that POSTs everything to its server. That felt
bad. So I built my own toolbox that never sends data anywhere.

It's called WeTool — free, no login, and every tool
runs 100% in your browser. You can open DevTools → Network and confirm
there are zero requests while you use it.

Here are the 15 I use most:

Everyday

JSON formatter / validator
URL encode / decode
Base64 encode / decode
Timestamp ↔ date converter

Security & encoding

Hash calculator (MD5 / SHA)
JWT parser
UUID generator
QR code generator

Text & format

Regex tester
Text diff
Markdown preview
SQL formatter

Debugging

Cron expression parser
Color converter
User-agent parser

Two things that matter to me and might to you:

Nothing is uploaded. No backend, no login, no tracking of what you type. Local-only.
15 languages. Most tool boxes are English-only; this one isn't.

It's free and I'm actively adding tools — if something you use daily is
missing, tell me in the comments and I'll add it.

👉 wetool.site

DEV Community: aassad

15 browser-based dev tools I use daily — no login, nothing uploaded