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Convert to WebM — Free Online Video Converter

Convert your videos to WebM format for optimized web playback. Instantly. No sign-up required.

Drop your video file here

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Accepted formats: MP4, AVI, MOV, MKV, WMV, FLV

Max file size: 100 MB (single file)

Your files never leave your device

Compress the video?

Reduce WebM file size

How to convert to webm

  1. 1.Upload your video file using the drop zone above
  2. 2.Choose your preferred quality level
  3. 3.Click "Convert to WebM" to start the conversion
  4. 4.Download your WebM file

About This Tool

WebM is an open, royalty-free media format designed specifically for the web. It delivers excellent compression and is natively supported by all modern browsers, making it ideal for website videos, HTML5 video tags, and web applications.

Our free convert to webm tool re-encodes your video using the VP9 video codec with Opus audio — the same codecs used by YouTube and other major platforms. Choose from three quality levels to balance file size and visual fidelity.

All processing runs in your browser via FFmpeg.wasm. Your video is never uploaded to any server. No watermarks, no limits, no account required.

Frequently Asked Questions

WebM is open-source and royalty-free. It often delivers better compression than H.264 MP4 at the same quality level, resulting in smaller files. It is the preferred format for web video on modern browsers.

All modern browsers support WebM: Chrome, Firefox, Edge, Opera, and Safari (version 14.1+). For maximum legacy compatibility, MP4 is still the safer choice.

High quality is best for presentations and detailed content. Medium gives a great balance of size and quality for most web videos. Low quality is useful for very large files where size matters most.

No. All conversion happens locally in your browser using WebAssembly. Your video never leaves your device.

VP9 encoding (used in WebM) is more computationally intensive than H.264 (used in MP4). The tradeoff is better compression — the output file is typically smaller at the same visual quality.

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