M4B to WEBM Converter

Convert M4B to WEBM online, for free.

Or drop files here. Max file size 1GB. Sign Up for more

Video Options

Video Codec

Choose a codec to encode or compress the video stream. To use the most common codec, select "Auto" (recommended). To convert without re-encoding video, choose "Copy" (not recommended).

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

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 use the most common codec, select "Auto" (recommended). To convert without re-encoding audio, choose "Copy" (not recommended).

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

Trim Settings

Trim Start

Specify the start position of trim (HH:MM:SS). Leave at 00:00:00 to disable.

Trim End

Specify the end position of trim (HH:MM:SS). Leave at 00:00:00 to disable.

Reset All Options

How to Convert M4B to WEBM?

Click the “Choose Files” button to select your M4B files.
Click the “Convert to WEBM” button to start the conversion.
When the status change to “Done” click the “Download WEBM” button

Best Quality

We use both open source and custom software to make sure our conversions are of the highest quality. In most cases, you can fine-tune conversion parameters using “Advanced Settings” (optional, look for the icon).

Free & Secure

Our M4B to WEBM Converter is free and works on any web browser. We guarantee file security and privacy. Files are protected with 256-bit SSL encryption and automatically deleted after 2 hours.

Convert Your M4B files to other formats

FreeConvert.com can convert your M4B files to these other formats:

M4B to WEBM Converter

How to Convert M4B to WEBM?

Best Quality

Free & Secure

Convert Your M4B files to other formats

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