Choose MP4 for broad everyday compatibility, WebM for web-focused delivery, or MOV when an editing workflow specifically requires it. A format conversion creates a new file, so start from your best source and convert only once whenever possible.
Convert a video in your browser
Choose MP4, WebM or MOV and download a fresh converted copy.
MP4 vs WebM vs MOV: what changes?
A video container holds encoded video, audio and timing information. MP4, WebM and MOV are containers; the codec inside the file determines how the pictures and sound are compressed. This is why two MP4 files can have very different sizes and compatibility.
MP4 is widely supported and is a practical delivery format. WebM was designed for efficient web media and works well in modern browsers. MOV is closely associated with Apple and professional editing workflows, although support depends on the codec used inside it.
Conversion is useful when an app rejects a file, a website needs a different format or a client requests a specific container. It cannot restore detail already missing from a low-quality source.
How to convert a video with Mediaivo
- Open Convert Video
Choose the best available source rather than a copy that has already passed through several exports.
- Select the output format
Pick MP4 for general delivery, WebM for web use or MOV when your destination explicitly asks for it.
- Process the file
Mediaivo creates a separate output, leaving the original on your device unchanged.
- Test the converted copy
Play the beginning, a motion-heavy section and the ending, then confirm that sound stays synchronized.
Which output format should you choose?
Match the format to the destination instead of converting simply because another extension looks more familiar.
| Situation | Recommended choice | Check before publishing |
|---|---|---|
| General sharing or uploading | MP4 | Confirm playback, audio and captions on the destination device. |
| Video embedded on a modern website | WebM | Keep an MP4 fallback if older-device compatibility matters. |
| Editing handoff or Apple-oriented workflow | MOV | Verify the receiving editor supports the actual codec inside the file. |
How to protect quality during conversion
Every lossy re-encode can remove information. Avoid converting the same delivery copy repeatedly; return to the original master when you need another format. If the source already looks blocky, a new container will not repair it.
Judge the result at its normal viewing size. Look at faces, text, fine textures, gradients and fast movement. Also listen through a complete spoken sentence to catch audio drift or channel problems.
Common mistakes to avoid
1. Changing only the filename extension
Renaming .mov to .mp4 does not convert the container or codec and can leave the file unreadable.
2. Converting several times
Repeated lossy exports can accumulate softness, banding and block artifacts.
3. Choosing a format without checking the destination
The best format is the one the receiving app, browser or editor accepts reliably.
4. Deleting the source immediately
Keep the original until the output has passed a full playback and upload test.
Final check before downloading or publishing
- The file opens on the target device.
- Video and audio remain synchronized.
- Orientation and aspect ratio are unchanged.
- Text and motion remain acceptably clean.
- The original master is stored safely.
Frequently asked questions
Is MP4 always smaller than MOV?
No. Size depends mainly on codec, bitrate, resolution, frame rate, duration and audio settings rather than the extension alone.
Can I convert MOV to MP4 without losing quality?
A lossy re-encode changes the data, but a good source and sensible settings can keep the visible difference small for normal viewing.
Why does a converted video have no sound?
The source audio codec may be unsupported or the source may not contain an audio stream. Test the original and inspect its metadata before converting again.
Does conversion change the original file?
No. Mediaivo produces a new downloadable copy and does not overwrite the source stored on your device.
Convert to the format your workflow needs
Choose one destination format, test the result and keep the original master.