ProRes is the format video work gets made in, not the format it gets watched in. Final Cut Pro exports it by default, Atomos and Blackmagic recorders capture straight to it, and editors pass ProRes masters around because every frame survives cutting and grading untouched. Then the edit is approved, someone asks for a copy they can actually play — on a phone, in a browser, in a chat message — and the problem appears: a ProRes file is enormous, and almost nothing outside an edit suite will open it.
This converter reads ProRes directly in your browser — a dedicated decoder is built into the page, covering ProRes 422 in all its flavors (Proxy, LT, 422, HQ) as well as 4444 and 4444 XQ — and re-encodes the video into an MP4 that plays everywhere. Unlike a typical iPhone MOV, which often just needs repackaging, ProRes always requires a genuine re-encode: MP4 players expect delivery codecs like H.264, so there is no lossless shortcut here. That is not a flaw of the converter — it is the same trade every “export for web” button in an editing app makes.
The privacy angle matters more than usual for this conversion. ProRes files tend to be unreleased work: client projects, film festival cuts, footage under NDA. Nothing here is uploaded — decoding and encoding both happen on your own machine, so a multi-gigabyte master is never sitting on someone else’s server, and you skip the hour-long upload before the conversion even starts.
Treat the resulting MP4 as a delivery copy, not a new master. Keep the ProRes original for future edits, and expect transparency from 4444 files to be flattened — MP4 delivery video has no alpha channel. One boundary worth knowing: ProRes RAW (from camera sensor capture) is a different beast and is not supported — this converter handles the standard ProRes family.
Why convert ProRes to MP4?
- ProRes barely plays outside editing software — MP4 plays on phones, TVs, browsers, and every upload form
- A built-in decoder reads ProRes 422 (Proxy, LT, 422, HQ), 4444, and 4444 XQ in any modern browser
- Multi-gigabyte masters convert on your own machine instead of uploading to a server first
- Client work and NDA footage stays on your device — nothing is transmitted anywhere
- Quality, resolution, and frame-rate controls let you size the delivery copy to its destination
How it works
- Step 1
Drop your files
Drag your ProRes files into the converter above, or click “Choose files”. Batches are welcome.
- Step 2
Pick your settings
MP4 is preselected. Adjust quality or size if you want, or keep the defaults.
- Step 3
Convert and download
Conversion runs locally in your browser. Download files individually or grab everything as a zip.
Frequently asked questions
- Why does ProRes to MP4 always re-encode?
- ProRes is an editing codec — its job is to keep every frame independently editable, which is also why the files are so large. MP4 players expect delivery codecs like H.264 or HEVC, so the video genuinely has to be re-compressed; simply moving ProRes into an MP4 shell would produce a file most players reject. This is why ProRes conversions never show the “lossless” tag that simple MOV repackaging jobs get, and why they take time proportional to the footage.
- Which ProRes variants are supported?
- The whole standard family: ProRes 422 Proxy, 422 LT, 422, 422 HQ, plus ProRes 4444 and 4444 XQ. The one exception is ProRes RAW — that is sensor data from camera capture rather than encoded video, and it is not supported here.
- Will the MP4 lose quality compared to my ProRes master?
- Some, by design — that is the entire point of a delivery format. ProRes stores near-mastering-grade 10-bit video at hundreds of megabits per second; a web-ready MP4 compresses far harder so it can stream and share. At the default settings the difference is hard to see on normal playback, but always keep the ProRes original as your master and re-export from it when you need another cut.
- What happens to the alpha channel in ProRes 4444 files?
- It gets flattened. ProRes 4444 can carry transparency for motion graphics work, but delivery MP4 video (H.264, HEVC) has no alpha channel, so the transparent regions are composited away during conversion. If you need transparency preserved, you need a format designed for it — keep the 4444 master for that work.
- How large a ProRes file can this handle?
- There is no artificial limit and nothing is uploaded, so the usual bottleneck — transferring gigabytes to a server — does not exist. Large files stream to your browser’s private storage during conversion rather than being held in memory, so multi-gigabyte masters work fine on a desktop machine. The conversion itself takes time: ProRes decoding is heavy, and your machine is doing the real work an export render would do.