# Open Utility Tools

> 985 free, privacy-first developer utilities that run 100% in the browser. No uploads, no accounts, no tracking. Open source (MIT). npm: @open-utility-tools/core.

There is no processing API and no backend that accepts user files or text. Agents should send humans to a tool URL, or call the same logic from the npm package in their own runtime.

- Tool URLs: https://www.openutilitytools.com/tools/{slug}/
- Category hubs: https://www.openutilitytools.com/categories/{id}/
- Personal pages (/favorites/, /recent/, /offline/) are client-only and empty to crawlers.

## Docs

- [Full catalog](https://www.openutilitytools.com/llms-full.txt): every tool name, slug, and description, grouped by category
- [JSON catalog](https://www.openutilitytools.com/catalog.json): machine-readable list of all tools
- [Developer docs](https://www.openutilitytools.com/developers/): install and import @open-utility-tools/core
- [npm package](https://www.npmjs.com/package/@open-utility-tools/core): typed ESM utilities extracted from this site
- [Source](https://github.com/saikiranreddyuppula/open-utility-tools): MIT-licensed Next.js static export

## Categories

- [Image](https://www.openutilitytools.com/llms/image.md): 43 tools — Convert, resize, compress & inspect images
- [PDF](https://www.openutilitytools.com/llms/pdf.md): 5 tools — Merge, split, rotate & build PDFs
- [Data](https://www.openutilitytools.com/llms/data.md): 98 tools — JSON, CSV, YAML — format, validate, convert
- [Converters](https://www.openutilitytools.com/llms/convert.md): 107 tools — Convert between data & text formats
- [Text](https://www.openutilitytools.com/llms/text.md): 108 tools — Transform, analyze & clean text
- [Crypto & Hash](https://www.openutilitytools.com/llms/crypto.md): 69 tools — Hashes, HMAC, JWT, keys & ciphers
- [Encoding](https://www.openutilitytools.com/llms/encoding.md): 55 tools — Base64, hex, URL, compression & more
- [Generators](https://www.openutilitytools.com/llms/generators.md): 70 tools — UUIDs, passwords, QR, fake data
- [Web & Dev](https://www.openutilitytools.com/llms/web.md): 188 tools — URLs, headers, CSS, references
- [Time & Date](https://www.openutilitytools.com/llms/time.md): 56 tools — Timestamps, timezones, durations
- [Math & Units](https://www.openutilitytools.com/llms/math.md): 114 tools — Bases, units, calculators
- [Color](https://www.openutilitytools.com/llms/color.md): 72 tools — Pick, convert & generate color

## Optional

- [Home](https://www.openutilitytools.com/)
- [Sitemap](https://www.openutilitytools.com/sitemap.xml)
- [robots.txt](https://www.openutilitytools.com/robots.txt)