Video converter — MP4, WebM, GIF, MP3, WAV, M4A

Convert MOV, MKV, AVI, WebM, and MP4 files to MP4, WebM, GIF, or audio, on your device.

Runs on your deviceFreeNo account

How to use Video converter

Drop a video, choose the output format, and tap Convert. For GIF, set the start, length, width, and frame rate. For MP3 or M4A, choose a bitrate. Keep the tab open until it finishes, then download.

Add your file

Drag & drop, browse files, or press Ctrl+V to paste from the clipboard where supported.

Process in the browser

Work stays in this tab with WebAssembly, Canvas, or other on-device APIs — your file is not uploaded to Omnipus.

Download or share

Save the result to your device, or share it with the OS share sheet when available.

Direct share: Install Omnipus as an app on Android to share files and links into this tool from other apps.

About this tool

A browser video converter built on FFmpeg compiled to WebAssembly. Open MOV, MKV, AVI, WebM, or MP4 and convert to MP4 (H.264 + AAC), WebM, an animated GIF, or extract the audio as MP3, WAV, or M4A. When the source video is already H.264 it is copied without re-encoding, which is fast and lossless; other codecs such as HEVC (iPhone), VP9, or ProRes are re-encoded on your device, which can be slow on phones. The FFmpeg core (~31 MB) downloads once and is cached. Files up to about 100 MB.

#video converter#convert video#convert video to mp4#mkv to mp4#online video converter

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Frequently Asked Questions

Is there a file size limit?

About 100 MB and roughly 45 minutes, because everything runs in browser memory. Larger files are refused rather than crashing the tab.

Why is converting some videos slow?

If the video is not H.264 (for example HEVC from an iPhone), it has to be re-encoded with a single-threaded WebAssembly encoder. Desktop computers are much faster than phones.

Will quality drop?

Copying H.264 into MP4 keeps quality exactly. Re-encoding uses a good-quality setting (CRF 23) but is still lossy.

Are my videos uploaded?

No. FFmpeg runs in this tab; only the encoder files are downloaded.

Is Video converter completely free to use?

Yes. Video converter on Omnipus is free to use with no subscription paywall for the tool itself.

Are my files or data uploaded to any servers?

No. Video converter processes your input locally in this browser tab. Your files and text are not sent to Omnipus. Some tools download an engine or model file the first time you use them; that is a download, not an upload.

Does Omnipus add watermarks to exported files?

No. Omnipus does not stamp a site watermark onto files you export from Video converter.

Can I use Video converter on my mobile phone?

Yes. Omnipus has touch-friendly controls and can be installed as an app. On Android you can also share files or links into tools from other apps.

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MOV to MP4Convert iPhone and QuickTime MOV videos to MP4 in your browser.MP4 to MP3Extract MP3 audio from MP4, MOV, and WebM videos in your browser.Video to GIFTurn a short video clip into an animated GIF.MP4 to WebMConvert an MP4 to WebM for the web.Video resizerScale a clip to 480p, 720p, or a custom width.Audio converterConvert FLAC, OGG, Opus, AAC, M4A, WAV, and MP3 between formats on your device.