Convert video formats free — MOV to MP4, MKV to MP4, ProRes to H.264 and MP4 to MOV, with a lossless remux when the codec already matches.
AI-powered audio review & delivery for voice production teams
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MP4, MOV, M4V, WebM, MKV or AVI
Container conversion — not compression.
This changes the format, not the file size or shape. Need a smaller file? Try the Video Compressor. Changing the aspect ratio for social? Use the Social Video Resizer. Just need the audio? Try Extract Audio from Video.
Upload a video, pick MP4 or MOV, and download the converted file
Every video file has two separate layers, and confusing them is what makes format conversion seem harder than it is:
.mp4 or .mov part. It decides how the streams are packaged and which players recognise the file.The crucial point: H.264 lives happily inside both MP4 and MOV. So a MOV is very often just an MP4 in a different box — same video stream, different wrapper. That is exactly why converting MOV to MP4 (or back) is usually instant.
Remuxing means re-wrapping the existing video and audio streams into a new container without touching the pixels. Because nothing is re-compressed, a remux is lossless — the output is bit-for-bit the same video — and it finishes in seconds rather than minutes. When you hand this tool a MOV that already contains H.264 and ask for MP4, it remuxes: no re-encode, no quality loss, near-instant.
Some sources do not use H.264, and MP4/MOV cannot stream-copy those codecs cleanly. In that case the converter re-encodes the video to H.264 (at a high-quality CRF 20, keeping the original resolution). You will see a re-encode for sources such as:
A re-encode takes longer and is technically lossy, but at CRF 20 the difference is visually negligible for almost all footage.
| Conversion | What happens |
|---|---|
| MOV (H.264) → MP4 | Lossless remux — instant |
| MKV (H.264) → MP4 | Lossless remux — instant |
| MP4 (H.264) → MOV | Lossless remux — instant |
| ProRes → MP4 | Re-encode to H.264 |
Converting the format changes the container and, when needed, the codec — it does not change the file size or the shape of the video. If you need a smaller file, use the Video Compressor. If you need to change the aspect ratio for Instagram, TikTok or YouTube, use the Social Video Resizer.
Limits: without an account you can convert one file up to 100 MB and 5 minutes. A free account raises that to 200 MB and 10 minutes per file. The length cap keeps a re-encode fast, because it runs while you wait — a remux is near-instant regardless.
MP4 and MOV are both containers, and both typically hold H.264 video, so the picture inside is often identical. The difference is compatibility: MP4 is the universal format that plays on virtually every phone, browser and social platform, while MOV is Apple's container, best suited to Final Cut Pro, QuickTime and macOS editing workflows. Choose MP4 for sharing and uploading, MOV for Apple-based editing.
Upload your MOV, choose MP4 as the target, and click Convert. If the MOV already contains H.264 video (most do), the file is remuxed losslessly into an MP4 in seconds — no quality loss. If it uses a different codec such as ProRes, it is re-encoded to H.264 automatically. Either way you download a ready-to-use MP4.
When the source is already H.264, no — the conversion is a lossless remux that copies the existing video stream untouched. When a re-encode is required (for ProRes, VP9, MPEG-4 and similar codecs), the tool encodes to H.264 at a high-quality CRF 20, so any quality change is minimal and usually invisible on real footage.
Yes. ProRes cannot be stream-copied into an MP4, so the converter re-encodes it to H.264 at the original resolution and wraps it in an MP4 (or MOV). The result is a small, widely compatible file — ideal when a ProRes master is too large or too specialised to share or upload directly.
Not on purpose. This tool changes the format, not the file size. A lossless remux keeps the size essentially the same, and a re-encode targets quality rather than a size limit. To shrink a video, use the Video Compressor — and to hit an exact target like 10 MB for email, a dedicated compress-to-size tool is coming.
Without an account you can convert one file up to 100 MB and 5 minutes. A free account raises that to 200 MB and 10 minutes per file. The length cap keeps each re-encode fast because it runs while you wait; a lossless remux is near-instant whatever the length.
Need it smaller, not just reformatted? Shrink the file size with a quality level you pick.
Change the aspect ratio for Instagram, TikTok, YouTube or Stories with platform presets.
Just need the sound? Pull the audio out of any video as an MP3 or WAV.
VoiceDeck adds AI-powered audio & video review and delivery for your whole team — so every file ships in spec, automatically.