How do I convert ASF to MP4?

Drop your ASF file onto the converter above, make sure MP4 is selected, and click Convert. When it's done, download the MP4 file — it usually takes a few seconds.

Is it safe to convert ASF to MP4 here?

Yes. ASF to MP4 conversion happens entirely inside your browser using WebAssembly, so your file is never uploaded to any server.

Is the ASF to MP4 converter free?

Yes — free with no watermark. Signed-out visitors can convert 25 files a day, and a free account raises that to 250.

Will converting ASF to MP4 reduce quality?

MP4 is a lossy format, but our defaults are tuned to be visually indistinguishable for most files. You can raise the quality under Options.

Can I convert multiple ASF files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

Can I convert MP4 back to ASF?

Yes — use our MP4 to ASF converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.

MP4→ASF MOV→MP4 ASF→MP3 GIF→MP4 ASF→WebP WebM→MP4 ASF→MOV MKV→MP4 ASF→GIF AVI→MP4 ASF→WAV WMV→MP4 ASF→WebM ASF→MKV ASF→M4A ASF→AVI ASF→FLAC ASF→AAC ASF→OGG ASF→WMV ASF→Opus ASF→FLV ASF→M4V ASF→MPEG ASF→3GP ASF→WMA ASF→MPG ASF→TS ASF→AIFF ASF→AMR ASF→VOB M4V→MP4 3GP→MP4 FLV→MP4 MPEG→MP4 TS→MP4 MPG→MP4 MTS→MP4 VOB→MP4 M2TS→MP4 APNG→MP4 OGV→MP4 MXF→MP4 DivX→MP4 3G2→MP4 RM→MP4 RMVB→MP4 F4V→MP4 PNG→JPG JPG→PNG PNG→WebP JPG→WebP WebP→PNG WebP→JPG HEIC→PNG HEIC→JPG MP4→MP3 PNG→JPEG JPG→JPEG JPEG→PNG JPEG→JPG PNG→PDF JPG→PDF PDF→PNG PDF→JPG HEIC→WebP MP4→WebP PDF→DOCX DOCX→PDF JPEG→WebP WebP→JPEG PNG→GIF JPG→GIF GIF→PNG GIF→JPG MP4→MOV WebP→PDF HEIC→JPEG WebP→GIF GIF→WebP HEIC→PDF MP3→WAV WAV→MP3 JPEG→PDF PDF→JPEG SVG→PNG SVG→JPG HEIC→GIF MOV→MP3 MP4→GIF JPEG→GIF GIF→JPEG PNG→AVIF JPG→AVIF AVIF→PNG AVIF→JPG MP3→M4A M4A→MP3 GIF→PDF SVG→PDF PNG→SVG JPG→SVG PDF→SVG SVG→WebP MOV→WebP MP4→WAV MP4→WebM WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV MKV→WebP PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A AAC→MP3 M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MKV→MOV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX PDF→TXT DOC→PDF TXT→PDF WebP→ICO ICO→WebP PPTX→PDF

ASFMP4

Convert ASF to MP4

Free and private: ASF files are converted in your browser on computers; on phones, in our fast cloud and deleted automatically.

In your browser (fast cloud on phones)
No watermark
Batch & ZIP download

How to convert ASF to MP4

1
Add your ASF files
Drag and drop ASF files onto the converter, paste them, or click to browse. You can add several at once.
2
Choose MP4
MP4 is already selected. Open Options if you want to change quality, size or metadata.
3
Convert
Click Convert. Your files are converted right in your browser in seconds.
4
Download your MP4
Download each MP4 file, or everything at once as a ZIP.

ASF vs MP4

From

ASF · Advanced Systems Format

ASF is Microsoft's streaming container behind WMV and WMA files.

Type: Video
Extension: .asf
MIME: video/x-ms-asf
Best for: legacy Windows Media streams

Legacy format

All ASF conversions →

MP4 · MPEG-4 Part 14

MP4 is the most widely supported video container. It usually holds H.264 or H.265 video with AAC audio and plays on every device and platform.

Type: Video
Extension: .mp4
MIME: video/mp4
Best for: sharing, streaming and uploading video anywhere

Lossy compressionOpen standard

All MP4 conversions →

Need it the other way around? Convert MP4 to ASF.

ASF to MP4: frequently asked questions

Free, private and in your browser