video / file

WEBM to MP4 Converter

Turn WEBM video into MP4 with codec-aware remux or fallback transcode.

This route starts with codec detection. If the streams are already MP4-safe, the job can stay fast with remux; otherwise it falls back to H.264 and AAC for compatibility.

Input

webm

Output

mp4

Speed

Can take a little longer

Best for

uploading to portals • sharing browser-captured clips

Convert your file

Upload WEBM

Supported input: webm. Max file size: 100 MB.

File availability

Downloads stay available for 1 day on your current access level.

Ready files get a temporary download link that you can open or share.

Media credits

Audio and video conversions use credits because they need more processing time.

Credit cost for this converter

Current account balance

Checking your account and credit balance.

WEBMDrop a file here or choose one from your deviceSelect a file to see supported formats, size limits, and the next steps before conversion starts.

Max file size: 100 MB

Convert multiple files

If you repeat the same format change often, you can prepare a batch and process several files together.

Batch conversion is available on the Pro plan. Sign in to upload up to 25 files at once for this converter.

After upload, SwapMyFile checks the file, runs the conversion, and prepares a temporary download link.

Before you start

You should know the result and the limits before the upload begins.

Automatic file cleanup

Clear format and size limits

Temporary download links

No signup for basic use

What stays

- duration
- track structure when streams can be remuxed

What may change

- quality if the source needs re-encoding
- some WEBM-specific metadata

Known limitations

- codec detection chooses between fast remux and slower transcode
- WEBM to MP4 remux jobs are capped at 20 minutes per file
- WEBM to MP4 fallback transcode is capped at 3 minutes per file
- the current live slice targets broad compatibility instead of every niche codec path