How do I convert a file online for free?

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.

Do I need to upload my files to convert them?

No. FileFettle runs entirely in your browser using WebAssembly and the Canvas API. Your files never leave your device and are never sent to any server.

What file formats can I convert?

FileFettle supports over 80 formats: 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).

Is there a file size limit?

No. Since conversion runs locally in your browser, there is no server-side file size limit. The only constraint is your device's available memory.

Is FileFettle free to use?

Yes — completely free, forever. No subscriptions, no paywalls, no ads, no tracking.

Can I convert video files in my browser?

Yes. FileFettle uses FFmpeg compiled to WebAssembly to convert audio and video files directly in your browser, with no server upload required.

How do I convert an image to WebP, PNG or JPG?

Drop your image file onto FileFettle (supports JPG, PNG, HEIC, GIF, TIFF, BMP, SVG, AVIF and more), choose WebP, PNG, or JPG as the output format, optionally resize or adjust quality, then click Convert to download instantly.

Free File Tools

Browser-based tools for PDF editing, image processing, checksums and encoding. No upload, no account.

No uploadNo account required100% freeRuns in browser

PDF Tools

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PDF Merge

Combine multiple PDF files into a single document in seconds.

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PDF Split

Extract individual pages or custom page ranges from any PDF.

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Image Tools

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Image Resizer

Resize images to exact pixel dimensions while preserving quality.

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Image Compressor

Reduce image file sizes with adjustable quality and format options.

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Utilities

File Hash Checker

Generate SHA-256, SHA-1, SHA-512 and MD5 checksums to verify integrity.

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Base64 Encoder / Decoder

Encode text or files to Base64, or decode Base64 strings instantly.

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Need to convert a file?

The main converter supports 80+ formats — images, audio, video, documents and data.

File Converter →