What's the best way to compress WebM for WhatsApp?

Upload your .webm file, pick WhatsApp as the platform (it's already selected on this page), and compress. We'll target 15.2 MB to stay safely under WhatsApp's 16 MB cap. Output is MP4 H.264 that plays inline on WhatsApp.

Does WhatsApp accept WebM files directly?

WhatsApp supports MP4, 3GP, and MOV. WebM needs to be converted to MP4 to send as a video message on WhatsApp — otherwise it sends as a generic file attachment.

Will quality drop when compressing to fit?

For short clips under a few minutes, the difference is hard to notice on a phone screen. For longer videos, we scale down resolution (1080p → 720p) before degrading quality at the original size. You can also trim the video to the highlight reel before compressing — that preserves full visual quality in the kept portion.

Do I need an account?

No. Upload, compress, download. Files auto-delete from our servers after 1 hour. No signup, no watermark, no email required.

WebM → WhatsApp

Compress WebM for WhatsApp

WhatsApp doesn't play WebM — period. Not as a video message, not inline on any platform. Android sometimes shows a generic thumbnail, iOS shows nothing at all. WebM is what browser screen recorders (Loom, Vimeo Record, the built-in Chrome extension) default to, so users who shoot a quick screen demo and try to send it via WhatsApp hit this wall constantly. This page does the only conversion WhatsApp understands — VP8/VP9 WebM → H.264 MP4 — and compresses to the 16 MB inline cap in one pass.

16 MB targetInput: WebMOutput: MP4 H.264

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How to compress WebM for WhatsApp

1Drag your .webm file onto the upload zone above (or browse to it).
2WhatsApp is already selected — we'll target 15.2 MB to stay safely under the 16 MB cap.
3Optionally trim to a highlight clip or switch to H.265 for 30-50% smaller files at the same quality.
4Download the compressed MP4 and share it on WhatsApp. Source file auto-deletes from our servers after 1 hour.

What to know about WebM → WhatsApp

WhatsApp on iOS won't even show a thumbnail for WebM; MP4 shows the full inline player.
Loom, Vimeo Record, browser-based recorders: all WebM by default, all need this conversion.
Opus audio inside WebM transcodes to AAC — WhatsApp requires AAC.
Shorter is better: under 60 seconds keeps quality high within 16 MB.

The compression math

A 90-second VP9 WebM screen recording = ~30 MB. WhatsApp 15.2 MB − 128 kbps audio = ~890 kbps video. H.264 720p CRF 29 = ~14 MB. Plays inline on Android and iOS alike.

About WebM files

WebM is Google's open, royalty-free video format that uses VP8 or VP9 video codecs. It's widely used by browser-based screen recorders (like Loom exports), Chrome extensions, and web applications. While WebM plays natively in Chrome and Firefox, it has poor support on iOS devices and is rejected by most social media platforms. CompressYourVideo.com converts WebM to compressed MP4 (H.264), making it compatible with every device and platform. This is especially common for screen recordings from browser tools, which default to WebM output. The conversion preserves video quality while often reducing file size, since H.264 is more efficient than VP8 at equivalent quality levels.

About WhatsApp

Compress videos to send on WhatsApp. WhatsApp limits videos to 16MB for regular messages. Our tool ensures your video fits while keeping the best possible quality.

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