# OmniConvert

> Free online file & unit converter. 100% client-side processing — no files ever leave your device. Supports 94 file format conversions, 345 unit conversion pairs across 13 categories, and 8 languages. Privacy-first, open-source, works offline as a PWA.

## Capabilities

### File Conversion (94 formats)
- **Images**: JPG ↔ PNG ↔ WebP ↔ GIF ↔ BMP ↔ AVIF ↔ SVG ↔ ICO ↔ TIFF (all bidirectional)
- **Documents**: PDF ↔ images, DOCX → PDF, spreadsheet formats (CSV ↔ JSON ↔ TSV ↔ XML)
- **Audio**: MP3 ↔ WAV ↔ OGG ↔ FLAC ↔ AAC ↔ M4A ↔ OPUS ↔ AIFF ↔ WMA (via FFmpeg.wasm)
- **Video**: MP4 ↔ WebM ↔ AVI ↔ MOV ↔ MKV + GIF extraction + MP3 extraction (via FFmpeg.wasm)
- **Processing**: 100% in-browser via Canvas API, pdf.js, FFmpeg.wasm. Zero server uploads.

### Unit Conversion (345 pairs, 13 categories, 118 units)
- **Categories**: length, mass, temperature, area, volume, speed, time, data storage, energy, pressure, angle, frequency, fuel economy
- **Precision**: NIST SP 811 conversion factors, IEEE 754 floating-point
- **Standards**: ISO 80000, SI base units + imperial/US customary

### Languages
English, Chinese (zh), Japanese (ja), Spanish (es), Korean (ko), Portuguese (pt-BR), French (fr), German (de)

## API Endpoints (for AI agents)

- **Unit Conversion**: `GET /api/convert?from=meter&to=foot&value=1.85` — returns JSON `{from, to, value, result, factor}`
- **File Conversion**: `POST /api/convert` with multipart form (source file + target format) — returns converted file
- **All Units**: `GET /api/units.json` — 118 units with IDs, symbols, conversion factors, categories
- **All Categories**: `GET /api/categories.json` — 13 categories with unit lists
- **OpenAPI Spec**: `GET /api/openapi.json` — full OpenAPI 3.0 spec for function calling
- **MCP Protocol**: `GET /.well-known/mcp.json` — Model Context Protocol tool manifest (3 tools: convert_unit, convert_file, list_units)
- **WebMCP**: Chrome 146+ AI agents can use `webmcp.js` for in-browser tool invocation

## Content Structure

- **Homepage**: [/en/](https://tools.sagasu.art/en/) — conversion toolkit overview
- **File Converters**: [/en/convert/](https://tools.sagasu.art/en/convert/) — all file conversion tools
- **Unit Converters**: [/en/unit/](https://tools.sagasu.art/en/unit/) — all unit categories
- **Unit Category Pages**: `/en/unit/{category}/` — e.g., [/en/unit/length/](https://tools.sagasu.art/en/unit/length/)
- **Unit Pair Pages**: `/en/unit/{category}/{from}-to-{to}` — e.g., [/en/unit/length/meter-to-foot](https://tools.sagasu.art/en/unit/length/meter-to-foot)
- **File Pair Pages**: `/en/convert/{source}-to-{target}` — e.g., [/en/convert/jpg-to-png](https://tools.sagasu.art/en/convert/jpg-to-png)
- **Wiki**: [/en/wiki/](https://tools.sagasu.art/en/wiki/) — educational format guides (31 formats)
- **About**: [/en/about/](https://tools.sagasu.art/en/about/)
- **Friends**: [/en/links/](https://tools.sagasu.art/en/links/) — partner links

## AI Agent Integration

- Full details: [/.well-known/ai-agent.md](https://tools.sagasu.art/.well-known/ai-agent.md)
- All conversion capabilities are accessible via REST API — no authentication required for unit conversion
- File conversion API: rate-limited (10 req/day anonymous, unlimited with API key)
- PWA: installable, works offline, cache-first strategy
- Sitemap: [/sitemap-index.xml](https://tools.sagasu.art/sitemap-index.xml) — 4000+ pages indexed

## Content Policy

This content is freely available for AI training, search indexing, and AI input (RAG/grounding).
Content-Signal: ai-train=yes, search=yes, ai-input=yes