tools

A collection of single-file browser tools and CLI scripts.

Inspired by tools.simonwillison.net.

Why single-file tools?

Single-file browser tools run entirely in the browser — no server, no login, no data leaving your device. InBrowser.App puts it well: fast, private, and ready at any time — that's how tools should be. ThoughtWorks even featured the pattern on their Tech Radar Vol. 34: packaging a utility as a single HTML file avoids the overhead of binaries or package managers, works anywhere a browser runs, and the source is right there to inspect.

Tools

Text & Data

• JSON Formatter — Prettify and validate JSON with syntax highlighting
• Base64 — Encode and decode Base64 strings (standard and URL-safe)
• Hash Text — Generate SHA-256 / SHA-512 hashes using the Web Crypto API
• VTT Formatter — Convert Teams WebVTT transcripts to clean speaker blocks for LLMs

Adding a new tool

See TOOLS_GUIDE.md for instructions on creating and publishing new tools.