krauq
Universal File Opener

360+ file types.
Everywhere you work.

Open, edit and check files on your own device.
Android, Windows, the web and your AI agents.

Explore the product
WindowsAndroidWebCLI
Windows
Android
  • PDF
  • DOCX
  • XLSX
  • PPTX
  • EPUB
  • HEIC
  • ZIP
  • EML
  • MKV
View all formats

One engine, four ways to use it.

Android

Version 2.9 · Google Play

Open, read and edit documents, PDFs, spreadsheets, slides, images, archives and media. The app has no internet permission.

Get it on Google Play

Windows

Version 1.6 · Microsoft Store

A desktop viewer and editor for Word, Excel, PowerPoint, PDF and media, with subtitles and a mini player for video.

Get it from Microsoft

Web

Free · In your browser

Open 300+ file types in a browser tab with nothing uploaded. See what is hidden in a file before you trust it.

Open UFO Web

CLI for AI agents

Version 1.6 · Linux

One local tool for every file your AI agent touches: a command line and MCP server for Claude Code, Codex and Cursor.

Install the CLI

See it work.

Android app Open 360+ file types on a phone, fill and sign PDFs, edit documents and see what each file hides. Watch on YouTube
Windows app Edit Word, Excel and PowerPoint with a real ribbon, watch video with subtitles and see what each file hides. Watch on YouTube
UFO Web Open PDF, Word, Excel and PowerPoint in a browser tab, then see what each file hides. Watch on YouTube
UFO CLI A real Claude Code session checks a client folder before trusting a single file. Watch on YouTube

The files and people in these films are fictional. Narration is AI-generated. Each film loads from YouTube only when you press play.

Private by design.

Your files stay on your device. No accounts, ads or tracking.

Works offline.

The apps and CLI open and edit files with no connection.

Free to start.

Free to open. Pro and organization licenses add more.