MP4 to WebM Converter

Convert and compress MP4 videos to WebM — 100% free, forever. No subscriptions, no credits, no file size limits, no sign-up required.
🔒 100% Offline ⚡ Runs in Your Browser ♾ Unlimited Conversions 🚫 No Account Needed
🎬

Drop MP4 Videos Here

Select or drop one or more .mp4 files — converted locally, never uploaded

🔄 Need to do the exact opposite? Try our WebM to MP4 Converter

Free MP4 to WebM Converter — 100% Private & Offline

This MP4 to WebM converter runs entirely inside your browser using WebAssembly. Your video files are never uploaded to any server — all processing happens locally on your device. This means your files stay completely private, even without an internet connection after the page loads.

Completely free, no strings attached. There are no subscription plans, no credit systems, no watermarks, no file size caps, and no daily conversion limits. You can convert as many MP4 videos as you want, as many times as you want — for free, forever.

Why convert MP4 to WebM? WebM is a royalty-free, open video format developed for the web. WebM files are typically 30–70% smaller than equivalent MP4 files, making them ideal for websites, web apps, and streaming. All major browsers (Chrome, Firefox, Edge, Safari) support WebM natively.

Batch conversion support. Select multiple MP4 files at once and convert them all in a single session. Once done, download each file individually or grab them all together in a single ZIP archive — no extra software needed.

Your privacy is guaranteed by design. Because conversion happens entirely offline in your browser, there is no risk of your videos being stored, analyzed, or shared. No account, no email, no tracking — just open the page and convert.

Explore Related Tools

WEBP PNG

WebP to PNG

Convert Google WebP images back to transparent PNG files with full pixel quality preservation.
IMG AVIF

AVIF Converter

Convert your images to next-gen AVIF format or decode AVIF back to PNG/JPEG.
SVG PNG

SVG to PNG

Convert vector SVG codes or files into pixel-based PNG images locally.

Frequently Asked Questions

What is the benefit of the WebM format? +
WebM is an open, royalty-free video format developed by Google specifically for the web. It provides excellent compression (especially with the VP9 codec), resulting in smaller file sizes for fast web streaming with minimal quality loss.
Will this tool reduce the file size of my MP4? +
Yes. Converting an MP4 to WebM generally optimizes the file for web delivery. You can use the quality settings to heavily compress the video if you need to embed it as a lightweight background video on a website.
Can I convert multiple videos at once? +
Yes, the tool supports batch processing. You can select multiple MP4 files, and your browser will convert them to WebM sequentially, saving you time.