OGV to MP4 Online Free — Converts in Your Browser

OGV is an old Ogg container format built around Theora video and Vorbis audio — it was common on early open-source video projects and Linux desktops years ago, but almost nothing plays it natively anymore. This tool decodes your OGV file and re-encodes it into a standard MP4 (H.264 + AAC) that opens everywhere: phones, editors, players, social media.

The whole conversion happens locally on your device. Your file is read into the browser, decoded and re-encoded there, and the resulting MP4 is handed straight back to you — it never gets uploaded anywhere, so there is nothing for us or anyone else to see.

Also useful: Convert OGV to WebM · Convert OGV to MP3

How it works

Upload the OGV video file you want to convert to MP4.
Wait while your browser decodes and re-encodes it locally — nothing is uploaded.
Download your converted MP4, ready to play anywhere.

Frequently asked questions

Is my video file uploaded to a server?

No. Everything runs inside your browser using WebCodecs and a small WebAssembly bridge. The file never leaves your device — that also means it works without an internet connection once the page has loaded.

What file size and length can I convert?

Up to 300MB on desktop (100MB on mobile). Because this tool re-encodes the video track, there is also a duration cap: 30 minutes on desktop, 10 minutes on mobile.

Which browsers does this work in?

You need an up-to-date Chrome, Edge, Firefox, or Safari — this tool relies on the WebCodecs API for the MP4 encode step. The first time you convert anything, the browser downloads a small conversion engine (~10MB) that then stays cached, so later conversions start instantly.

Convert OGV to MP4