Convert your .mp4 files to .webm format online. No software to install.
Pro plan required (from €4.99 / $4.99/month).
Drag and drop your .mp4 file or click to browse.
Select WebM as your output format.
Click Convert and download your .webm file.
Converting MP4 to WebM enables royalty-free web delivery. MP4 (MPEG-4 Part 14) and WebM (Web Media) use different container structures with different strengths.
MP4 (MPEG-4 Part 14, introduced in 2001) uses proprietary compression. WebM (Web Media, introduced in 2010) uses proprietary compression. MP4 browser support: Universal. WebM browser support: All modern browsers (Chrome, Firefox, Edge; Safari with AV1 only).
The quality impact depends on the specific settings used during conversion. WebM uses compression that may affect quality depending on the chosen settings.
Typical MP4 file size: A 1-minute 1080p H.264 video: ~15-30 MB; 4K: ~50-100 MB. Typical WebM file size: A 1-minute 1080p VP9 video: ~10-20 MB.
VP9 encoding is significantly slower than H.264 but produces comparable quality at lower bitrates. Use the "good" quality preset with CRF 31-33 for a solid balance of quality and file size. For maximum quality, use two-pass encoding.
Pro plan required (from €4.99 / $4.99/month). No watermarks.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Convert files from any device: desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .webm file maintains the best possible quality. No unnecessary compression or quality loss.
Video conversion requires a Pro account. See pricing, from €4.99 / $4.99/month
No. Video conversions need a Pro plan (from €4.99 / $4.99/month), with 100 audio or 20 video conversions a month.
It depends on the file size and on the queue at our provider. Small files usually take a few seconds.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.