ASF to MPEG Converter

Convert ASF to MPEG Online

ASF is Microsoft's Advanced Systems Format — the Windows Media container that usually wraps WMV video and WMA audio, and that stubbornly refuses to play on anything outside the Windows ecosystem. This converter re-encodes those .asf files into a standard MPEG program stream (.mpeg) with MPEG-2 video and MP2 audio by default, so the result opens in VLC, QuickTime, hardware disc players, and almost every legacy editor without hunting for a codec pack.

How to Convert ASF to MPEG

1. Upload Your ASF File: Drag and drop or click "+ Add Files" to add .asf clips — Windows Media exports, old screen recordings, or streamed captures. Batch is supported.
2. Pick a Quality Preset: The default Quality Preset is "Very High (Recommended)", which targets near-DVD MPEG-2. Switch to Specific file size to cap the output in MB, or Constant Bitrate / Variable Bitrate for finer control.
3. Resize or Trim (Optional): Under Video resolution keep the original, pick a Preset Resolution (e.g. 720×480 for NTSC DVD), or set a custom Width × Height. Use Trim with a Time Range to cut intros before encoding.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

ASF vs MPEG at a Glance

The default MPEG-2 output is the right pick for almost every use; choose MPEG-1 only when you specifically need VCD-era compatibility. If you want a smaller, modern file instead, ASF to MP4 produces H.264 at a fraction of the size.

Frequently Asked Questions

Does converting ASF to MPEG lose quality?

Yes — it is a lossy-to-lossy re-encode. ASF holds WMV/VC-1 video and WMA audio, while this MPEG output holds MPEG-2 video and MP2 audio; the codecs differ, so the video is fully decoded and re-encoded with no lossless remux path between them. You cannot recover detail the original WMV encode already discarded. Keep the Quality Preset on "Very High (Recommended)" and avoid repeated round trips to minimize visible loss.

Why is my MPEG file larger than the original ASF?

MPEG-2 is a 1995-era codec, while WMV 9 / VC-1 compresses noticeably more efficiently at the same visual quality. Re-encoding Windows Media into MPEG-2 usually grows the file because the older codec needs more bits to match perceived quality. That is the expected trade-off for universal hardware playback. If size matters more than legacy compatibility, use ASF to MP4 for a much smaller H.264 file, or shrink the result afterward with Compress MPEG.

What's the difference between .mpeg and .mpg?

.mpeg and .mpg are interchangeable extensions for the same multiplexed MPEG program stream — they carry identical content; the only difference is the filename. This page outputs the .mpeg extension specifically; some older DVD-authoring and disc-burning tools expect .mpg, in which case you can simply rename the file or use the ASF to MPG endpoint for the same program stream under that name.

Does the audio get converted too?

Yes. The WMA audio inside the .asf is decoded and re-encoded into MP2 (MPEG-1 Audio Layer II) by default, which every MPEG-aware player and DVD-authoring tool accepts, and video and audio stay in sync. Multichannel WMA Pro audio is downmixed to stereo for a standard .mpeg. In our testing, a short standard-definition .asf clip at the default Very High preset produced an MPEG-2 .mpeg slightly larger than the source — normal for the older codec.

What's the practical file size limit?

There is no fixed file-count cap, and conversion runs on our servers rather than your machine, so the real constraint is upload size and connection speed — a large .asf simply takes longer to upload before encoding starts. You can queue multiple files in one batch and download them individually or as a ZIP. Files are removed from our servers automatically after a few hours.