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Convert MP4 to WEBM Online

Swap Formats

Convert MP4 files to WEBM instantly in your browser. Free, fast, and 100% private - your files never leave your device. No account or software required. Supports batch conversion and custom settings.

Choose MP4 files or drag & drop

Multiple files supported · No file size limit

100% PrivateNo UploadFree

Video Settings

How to Convert MP4 to WEBM - 3 Simple Steps

1

Upload Your MP4 File

Drag and drop your MP4 file into the upload area above, or click to browse your device. You can upload multiple files at once for batch conversion.

2

Adjust Settings

Set your preferred quality, resize dimensions, or other format-specific options. The default settings are optimized for the best WEBM output.

3

Download WEBM File

Click Convert and your WEBM file is ready instantly. Download individual files or click "Download All as ZIP" for batch results.

MP4 vs WEBM — Format Comparison

FeatureMP4WEBM
File SizeMedium (H.264/H.265)Small to medium (VP9/AV1)
CompressionLossyLossy
Transparency (Alpha)✗ Not supported✓ Supported
Animation✓ Supported✓ Supported
Vector-based✗ No (raster)✗ No (raster)
Browser SupportAll major browsersChrome, Firefox, Edge (limited Safari)
Best ForVideo sharing, streaming, social media, web playbackHTML5 video, web publishing, open-source projects

Also Convert MP4 to:

MP4 → AVIMP4 → MOVMP4 → GIF

Convert Other Formats to WEBM:

GIF → WEBMAVI → WEBMMOV → WEBM

Why Use ConvertTheFile for MP4 to WEBM?

🔒

100% Private

Files are converted in your browser and never uploaded to any server.

⚡

Instant Conversion

No waiting for uploads or server processing. Results are instant.

🆓

Completely Free

No limits, no watermarks, no account required - forever free.

📦

Batch Conversion

Convert multiple files at once and download them as a ZIP archive.

Frequently Asked Questions — MP4 to WEBM Converter

How do I convert MP4 to WebM?
Upload your MP4 file, choose your quality settings, and click Convert. The converter uses FFmpeg.wasm running in your browser to re-encode the video to WebM format. Conversion time depends on file size.
Why convert MP4 to WebM?
WebM is optimized for web playback and often produces smaller files than MP4 at similar quality. It's required for HTML5 video cross-browser compatibility and is preferred by platforms like YouTube for VP9 streaming.
Does WebM have better quality than MP4?
At similar bitrates, VP9 (WebM) and H.264 (MP4) produce comparable quality. VP9 at higher settings can produce smaller files with similar visual quality to H.264.
How long does MP4 to WebM conversion take?
Conversion speed depends on your device's CPU speed and the video file size. A 1-minute 1080p MP4 typically takes 2–5 minutes on a modern laptop.
Is the video conversion private?
Yes. FFmpeg.wasm runs entirely in your browser — your video files are never uploaded to a server.
What video codecs does the WebM output use?
The converter uses VP8 by default, which has the best compatibility. VP9 is also available for better compression at the cost of slower encoding.

About MP4 (MPEG-4 Part 14)

MP4 is the most universal video format, combining H.264/H.265 video with AAC audio. Supported by virtually every device, browser, and platform.

Learn more about MP4 →

About WEBM (WebM Video Format)

WebM is an open, royalty-free video format developed by Google for web use, using VP8/VP9 or AV1 video codecs. Ideal for HTML5 video.

Learn more about WEBM →