A collection of single-file HTML tools. Each tool is an independent HTML file that runs entirely in the browser with no backend required.
Inspired by Simon Willison's Tools.
| Tool | Description |
|---|---|
| base64 | Base64 encoding/decoding with Unicode support |
| countdown | Countdown timer with shareable links |
| converter | JSON/YAML/TOML format converter |
| diff | Side-by-side text comparison |
| duration | Calculate duration between two timestamps |
| json | JSON formatter/minifier with folding |
| password | Configurable password generator |
| rsa | RSA private key parser |
| certificates | X.509 certificate parser |
| brewfile | Homebrew Brewfile analyzer with dependency graph |
| image | Docker/OCI container image analyzer |
| kubernetes | Kubernetes resource analyzer (Pod, Deployment, etc.) |
| calendar | Printable yearly calendar with event support |
- HTML5 + CSS3 + Vanilla JavaScript
- CodeMirror 5 - Code editor (converter, json, brewfile)
- Flatpickr - Date/time picker (countdown, duration)
- Cytoscape.js - Graph visualization (brewfile)
- Dark theme (deep blue/purple gradient background)
- Frosted glass effect cards
- Responsive layout
- All processing done client-side for privacy