What's the best way to compress WebM for Gmail / Email?

Upload your .webm file, pick Gmail / Email as the platform (it's already selected on this page), and compress. We'll target 23 MB to stay safely under Gmail / Email's 25 MB cap. Output is MP4 H.264 that plays inline on Gmail / Email.

Does Gmail / Email accept WebM files directly?

Gmail / Email plays MP4 inline. We convert WebM to MP4 during compression so it displays properly in Gmail / Email's video player.

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 → Gmail / Email

Compress WebM for Gmail / Email

WebM attachments are a compatibility minefield for email: Chrome and Firefox preview them in Gmail, but Outlook for Windows, Apple Mail, and every iOS email app refuse to play them without downloading to an external app. Since most recipients are on iOS Mail, Outlook, or the Apple Mail desktop client, a WebM attachment often means 'download this to somewhere else, open it in VLC.' This page transcodes to MP4 H.264 — which previews inline in every email client on every OS — and compresses to Gmail's 25 MB cap in the same pass. Especially useful for Loom and browser-screen-recorder exports, which default to WebM.

25 MB targetInput: WebMOutput: MP4 H.264

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How to compress WebM for Gmail / Email

1Drag your .webm file onto the upload zone above (or browse to it).
2Gmail / Email is already selected — we'll target 23 MB to stay safely under the 25 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 Gmail / Email. Source file auto-deletes from our servers after 1 hour.

What to know about WebM → Gmail / Email

iOS Mail, Apple Mail, Outlook for Windows — all require download-to-external-app for WebM. MP4 plays inline.
Loom's 'Download' button: WebM. Loom's share link: MP4 stream. If you prefer attachments, this converts.
Corporate firewalls sometimes strip WebM as 'unknown video' — MP4 gets through.
1080p Loom recordings stay 1080p; only bitrate drops.

The compression math

A 3-minute 1080p Loom WebM (VP9) = ~85 MB. Gmail 23 MB target − 128 kbps audio = ~970 kbps video. H.264 720p CRF 28 = ~22 MB, fine for email preview on any monitor.

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 Gmail / Email

Compress videos to send by email. Gmail limits attachments to 25MB and most email services cap at 20-25MB. Our tool fits your video within these limits.

Related compression tools

Compress any WebM video Compress any format for Gmail / Email

Or compress WebM for a different platform

WebM → WhatsApp WebM → Discord WebM → Telegram WebM → Instagram WebM → IG Story WebM → TikTok WebM → YT Shorts WebM → Facebook