Convert any file,
instantly & privately.
100% in your browser — your files never touch a server.
No file size limit
Files never leave your device
No daily limits
No account required
Choose file type
How it works
1
Drop your file
Drag & drop onto the zone, click to browse, or paste from clipboard. Any size, any device.
2
Choose a format
Pick a category, then select the output format — 80+ options across images, audio, video, documents and data.
3
Download instantly
Your file is converted locally in seconds and downloaded. Zero data ever leaves your device.
Frequently asked questions
Drop your file onto FileFettle, select your output format, and click Convert. Your file is processed instantly inside your browser — no upload, no registration, completely free.
Never. FileFettle uses WebAssembly and the Canvas API to process files entirely in your browser. Zero bytes of your data are ever sent to any server.
Over 80 formats across 5 categories — images (JPG, PNG, WebP, AVIF, HEIC, GIF, SVG, TIFF, BMP), audio (MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, AIFF, WMA), video (MP4, WebM, MOV, AVI, MKV, WMV, MPEG), documents (PDF, DOCX, TXT, HTML, Markdown), and data (CSV, JSON, XML, YAML, XLSX, XLS, ODS, TOML, INI).
No. Since conversion runs in your browser, there's no server-side size limit. The only constraint is your device's available RAM — which handles most files without issue.
Yes — completely free, forever. No subscriptions, no paywalls, no ads, no tracking. Optional voluntary contributions help keep the project running.
Video and audio conversion uses FFmpeg compiled to WebAssembly. The first time you convert, your browser downloads a ~30 MB package — this only happens once and is then cached, so subsequent conversions start instantly.
Drop your image (supports JPG, PNG, HEIC, GIF, TIFF, BMP, SVG, AVIF and more), choose your output format — JPG, PNG, WebP, etc. — optionally resize or adjust quality, then click Convert.