Convert ASF to WEBM

Easily convert your ASF files to WEBM format online.

Or drop files here

Video Options

Video Codec

Choose a codec to encode video. “Auto” uses the most common codec (default). Select “Copy” to convert without re-encoding (use only if the target format support original codec)

Video Rate Control

Video Bitrate ?

Video Screen Size

Select a resolution for your video (width x height) in pixels.

Video Aspect Ratio

Change the ratio between width and height, for example, 4:3 or 3:2

Video Frame Rate

Change FPS (frames per second) of video

Cut Video

Specify a trim start/end position (HH:MM:SS) to cut video

Rotate Video

Video will be rotated clockwise.

Flip Video

Add Subtitles

Choose a file Browse

Upload a .srt or .ass subtitle file to be burned into your video.

Audio Options

Audio Codec

Choose a codec to encode or compress the audio stream. To convert without re-encoding audio, choose "Copy." To use the most common codec, select "Auto."

Audio Bitrate

Audio Channel

Adjust Volume

100

100% represents the original volume. To double the volume, increase it to 200%. To reduce volume by half, select 50%

Fade In Audio

Fade Out Audio

Remove Audio

Reset All Options

This free online tool lets you convert your files from ASF to WEBM format quickly and easily. You can also batch convert ASF to WEBM format by uploading multiple ASF files above.

How to convert ASF to WEBM?

Drag and drop your ASF files in the upload box above
Click on the blue "Convert to WEBM" button to start conversion
Once the conversion finishes, click the “Download” or “Download All” (Zip archive of all files) to download your WEBM files.

What file types are supported?

This ASF to WEBM converter supports conversion of ASF files such as .asf, .wma, .wmv to WEBM video format. Max file size supported is: 1GB.

What is an ASF (Advanced Systems Format) file?

Advanced Systems Format (ASF) is a proprietary Microsoft product, which serves as a container for Windows multimedia content. Microsoft designed it for streaming and to be independent of systems and protocols. It supports chapters, captions, subtitles, metadata tags, streaming, and hardware players, but does not support menus.

How to open an ASF file?

It is best to use Windows Media Player to open an ASF file. Alternatively, VLC media player is a good choice too. Keep in mind that ASF can contain WMA and WMV files, which might display as the file extension of the ASF file.

Developed by: Microsoft

Initial release: 1995

Useful links:

https://en.wikipedia.org/wiki/Advanced_Systems_Format

https://docs.microsoft.com/en-us/windows/desktop/wmformat/overview-of-the-asf-format

What is a WEBM (WebM) file?

WebM (WEBM) is a freely-licensed file container designed for the Web. Specifically, it was designed to be compatible with HTML5, originally. It supports chapters, captions, subtitles, metadata tags, streaming, attachments, 3D codecs, 3D containers, and hardware players. WEBM compresses video streams with VP8 or VP9 codecs, and audio with Vorbis or Opus codecs.

How to open a WEBM file?

VLC media player and MPlayer can open WEBM files on any operating system (OS). Other good choices for opening WEBM include Winamp for Microsoft Windows OS, and Elmedia for Mac OS X.

Microsoft browsers do not have built-in WebM codecs. Therefore, install the codecs separately. However, most browsers support WEBM files.

Developed by: Google; CoreCodec, Inc.

Initial release: 2010

Useful links:

https://en.wikipedia.org/wiki/WebM

https://tools.google.com/dlpage/webmmf/

Convert Your ASF files to other formats

FreeConvert.com can convert your ASF files to these other formats:

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Convert other files to WEBM format

FreeConvert.com can convert your other files to WEBM format: