Runs on-device · No upload · No sign-up

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

Pick a file

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

02 · Process

Convert on-device

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

03 · Download

Save the result

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

Private by design

Files are processed in your browser and never uploaded.

No account needed

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

Free, no watermark

Converted files are yours, unmarked and unlimited.

Works offline-ish

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

Supported formats

MP4WebMMKVGIF MP3WAVOGGFLACAAC

Frequently asked questions

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.