Convert ASF Files to MP4 on Your Device

Convert ASF to MP4 in your browser for general playback and sharing. The source remains on your device throughout local processing.

Drop files here or browse (MAX 500 MB)

Max 500 MB per file

Preview (optional)

When your browser supports it, your video appears here. If preview does not load, you can still convert your file normally.

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File name

Adapt Windows-oriented distribution to a workflow built for general playback and sharing
Supply MP4 when an editor, player, or delivery form will not accept ASF
Create a MP4 copy from ASF for phones, browsers, players, and upload forms

Encoding speed depends on the processor available to this tab during this ASF-to-MP4 job.
A short ASF sample is quicker to process than a full-length recording.
Review the beginning and end of MP4 after the download finishes.

MP4 serves phones, browsers, players, and upload forms, whereas ASF commonly serves older Windows streaming and enterprise players.
For ASF-to-MP4 delivery, plan for destination-specific internal codec rules.
After leaving ASF, the receiving app must support the streams encoded inside MP4, not only its extension.

ASF to MP4 taking too long? Reduce other processor activity and leave the page open until completion.
MP4 converted from ASF not opening? Test a compatible player and inspect the output streams.
Check whether the receiver supports this MP4 variant: destination-specific internal codec rules.

When does ASF to MP4 conversion make sense?

It is useful when ASF media created for Windows-oriented distribution must enter a MP4 system designed for general playback and sharing.

Where is the ASF source processed?

The browser prepares MP4 from ASF on this device instead of sending the source to a remote conversion server.

How can I approve MP4 converted from ASF?

Test the MP4 file in the receiving app and compare duration, picture, sound and timing with the ASF source.

Quick use cases