What's the best way to compress WebM for Twitter / X?

Upload your .webm file, pick Twitter / X as the platform (it's already selected on this page), and compress. We'll target 500 MB to stay safely under Twitter / X's 512 MB cap. Output is MP4 H.264 that plays inline on Twitter / X.

Does Twitter / X accept WebM files directly?

Twitter / X plays MP4 inline. We convert WebM to MP4 during compression so it displays properly in Twitter / X'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 → Twitter / X

Compress WebM for Twitter / X

Twitter (X) accepts MP4 and MOV only for uploads — WebM gets rejected at the compose screen with a generic 'unsupported format' error. For creators using Loom, Chrome's screen recorder, or browser-based tools that default to WebM, this page is the direct fix: transcode VP8/VP9 to H.264, Opus to AAC, and package in MP4 with faststart for Twitter's streaming player. We also respect Twitter's 2:20 free-tier duration cap — if your WebM is over 140 seconds, you'll need to trim separately (use our main compressor with trim mode) before hitting the 512 MB free-tier size cap.

512 MB targetInput: WebMOutput: MP4 H.264

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How to compress WebM for Twitter / X

1Drag your .webm file onto the upload zone above (or browse to it).
2Twitter / X is already selected — we'll target 500 MB to stay safely under the 512 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 Twitter / X. Source file auto-deletes from our servers after 1 hour.

What to know about WebM → Twitter / X

Twitter rejects WebM at compose — it's a format block, not a size issue.
Free-tier duration cap is 2:20 (140 seconds); X Premium unlocks longer.
Twitter re-encodes aggressively, so upload at the highest quality that fits 512 MB.
Loom's direct download = WebM → this page; Loom share link = MP4 stream (no conversion needed).

The compression math

A 2-minute 1080p VP9 WebM = ~50 MB. Twitter target 500 MB (plenty of headroom), H.264 1080p CRF 22 = ~55 MB. Sized for Twitter's re-encoder to have good source material.

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 Twitter / X

Compress videos for Twitter/X. Twitter's free tier allows up to 512MB, but videos must be under 2 minutes 20 seconds. X Premium users get 16GB and longer duration.

Related compression tools

Compress any WebM video Compress any format for Twitter / X

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