Convert MP4 Files to ASF on Your Device

Convert MP4 to ASF in your browser for Windows-oriented distribution. 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.

Ready

File name

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

The device processor performs decoding and encoding during the job during this MP4-to-ASF job.
Large MP4 inputs may take several minutes on older hardware.
Inspect the ASF file in the exact player or editor that will receive it.

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

MP4 to ASF taking too long? Try a small source first to separate a performance issue from a format issue.
ASF converted from MP4 not opening? Test a compatible player and inspect the output streams.
Match ASF resolution, rate, channels, and codec to the published delivery rules.

When does MP4 to ASF conversion make sense?

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

Where is the MP4 source processed?

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

How can I approve ASF converted from MP4?

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

Quick use cases