How do I convert ASF to WebM?

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

Is it safe to convert ASF to WebM here?

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

Is the ASF to WebM 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 WebM reduce quality?

WebM 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 WebM back to ASF?

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

WebM→ASF ASF→MP4 MP4→WebM ASF→MP3 MOV→WebM ASF→WebP GIF→WebM ASF→MOV MKV→WebM ASF→GIF AVI→WebM ASF→WAV 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 WMV→WebM M4V→WebM 3GP→WebM FLV→WebM MPEG→WebM TS→WebM MPG→WebM MTS→WebM VOB→WebM M2TS→WebM APNG→WebM OGV→WebM MXF→WebM DivX→WebM 3G2→WebM RM→WebM RMVB→WebM F4V→WebM 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 MOV→MP4 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 GIF→MP4 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 WebM→MP4 WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV MKV→MP4 HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI AVI→MP4 MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB 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

ASFWebM

Convert ASF to WebM

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 WebM

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 WebM
WebM 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 WebM
Download each WebM file, or everything at once as a ZIP.

ASF vs WebM

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 →

WebM · WebM Video

WebM is an open, royalty-free video format designed for the web, using VP8/VP9 or AV1 video with Opus audio.

Type: Video
Extension: .webm
MIME: video/webm
Best for: video on websites and in browsers

Lossy compressionOpen standard

All WebM conversions →

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

ASF to WebM: frequently asked questions

Free, private and in your browser