File Converter
Drop your files below. All processing happens locally in your browser.
Drag & drop files
Images, Videos, Audio, Documents, Spreadsheets & Archives
Max file size: 400MB · No uploads. Runs entirely in your browser.
Output Format
Images
Videos
Audio
Documents
Text & Data
Spreadsheets
Archives
Settings
All processing happens in your browser
Powered by WebAssembly & Canvas API
Convert Files In Your Browser
Real file conversion — not just renaming. Video transcoding, image encoding, audio processing, document transforms. 100% private, nothing leaves your device.
Why CookFile?
100% Private
Your files never leave your device. Zero uploads, zero tracking, zero data collection.
Real Conversion
Powered by FFmpeg WebAssembly. Actual video transcoding, audio encoding, and format transforms.
Completely Free
No sign-up, no watermarks, no limits on conversion count. Use as much as you need.
Formats We Support
Real conversion between these formats — not just renaming file extensions.