Convert video & audio without the upload.

Drop a file in and it's converted right here in your browser tab — using WebAssembly, not a server. Nothing you convert ever leaves your device.

Drop a video or audio file here
or click to browse — nothing uploads anywhere

Loading engine… 0%

Your file is ready —

Download

Best for files under ~300MB — larger files take longer since your device does the work, not a server.

01 · Upload

Drag one in or browse — it's read directly into your browser's memory, nothing is sent out.

02 · Process

A WebAssembly build of FFmpeg does the encoding locally, using your device's own processor.

03 · Download

The converted file downloads straight from your browser. No queue, no email, no watermark.

↺ the file's path starts and ends on your device — it never goes anywhere in between

Files are processed in your browser and never uploaded.

No sign-up, no email, no login wall.

Converted files are yours, unmarked and unlimited.

Once the engine loads, conversion keeps running without a live connection.

Supported formats

MP4WebMMKVGIF MP3WAVOGGFLACAAC

Is ConvertLocal really free? +

Yes — no sign-up, no plan, and no watermark on what you convert.

Do you store or see my files? +

No. Conversion runs inside your browser using WebAssembly. Your file is never uploaded to a server — ours or anyone else's.

What formats are supported? +

Video: MP4, WebM, MKV, and GIF. Audio: MP3, WAV, OGG, FLAC, and AAC — including extracting audio from a video file.

Is there a file size limit? +

No hard limit, but since your device does the work, very large files will simply take longer depending on its processor.

Do I need to install anything? +

No. It runs in any modern desktop or mobile browser tab.