Is this video converter free to use?

Yes, completely free — no account, no subscription, no hidden fees. Open the page and start converting immediately.

Is my video uploaded to a server? Is it safe?

No upload ever happens. ffmpeg.wasm runs the entire conversion inside your browser tab. Your video never touches any server and is never shared with anyone — it is completely private.

Which video formats are supported?

You can convert to MP4 (H.264), WebM (VP8/VP9), MOV, MKV and animated GIF. Most common input formats — including MP4, WebM, MOV, MKV, AVI and 3GP — are accepted, since ffmpeg.wasm supports a wide range of codecs.

Why is conversion slow on large files?

Because everything runs in your browser, processing speed depends on your device's CPU — there are no cloud servers doing the heavy lifting. Larger files and higher resolutions naturally take more time. For best speed, close unused browser tabs to free up memory while converting.

Does the video converter work on mobile devices?

Yes, it works on modern mobile browsers that support WebAssembly (Chrome for Android, Safari on iOS 16+). However, mobile CPUs are slower and RAM is more limited, so conversion of large or high-resolution videos may be significantly slower or may require splitting into shorter clips.

🔄 Video Converter — MP4, WebM, MOV, MKV & GIF, Free & Private

Convert any video to MP4, WebM, MOV, MKV or GIF instantly — your file never leaves your device. Powered by ffmpeg.wasm, all processing runs client-side inside your browser with no upload required and no account needed. Looking for a free CloudConvert alternative? Toolio’s version is completely free and needs no sign-up.

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Private by design. This tool runs entirely in your browser — nothing you enter is uploaded or stored, and it works offline.

About

This video converter runs entirely in your browser using ffmpeg.wasm, a WebAssembly port of the industry-standard FFmpeg library. Supported output formats include MP4 (H.264), WebM (VP8/VP9), MOV, MKV and animated GIF. Because conversion is 100% client-side, your video files are never uploaded to any server, never stored remotely, and never shared — your content stays completely private. The tool works offline after the initial page load, making it ideal for sensitive footage or air-gapped environments. Note that large files take longer to process since all computation happens on your CPU inside the browser tab.

How to use

Click 'Choose File' and select the video you want to convert from your device.
Select the output format — MP4, WebM, MOV, MKV or GIF — from the format dropdown.
Click 'Convert' and wait while ffmpeg.wasm processes the video entirely in your browser.
Once conversion is complete, click 'Download' to save the converted file to your device.

FAQ

Is this video converter free to use?: Yes, completely free — no account, no subscription, no hidden fees. Open the page and start converting immediately.
Is my video uploaded to a server? Is it safe?: No upload ever happens. ffmpeg.wasm runs the entire conversion inside your browser tab. Your video never touches any server and is never shared with anyone — it is completely private.
Which video formats are supported?: You can convert to MP4 (H.264), WebM (VP8/VP9), MOV, MKV and animated GIF. Most common input formats — including MP4, WebM, MOV, MKV, AVI and 3GP — are accepted, since ffmpeg.wasm supports a wide range of codecs.
Why is conversion slow on large files?: Because everything runs in your browser, processing speed depends on your device's CPU — there are no cloud servers doing the heavy lifting. Larger files and higher resolutions naturally take more time. For best speed, close unused browser tabs to free up memory while converting.
Does the video converter work on mobile devices?: Yes, it works on modern mobile browsers that support WebAssembly (Chrome for Android, Safari on iOS 16+). However, mobile CPUs are slower and RAM is more limited, so conversion of large or high-resolution videos may be significantly slower or may require splitting into shorter clips.