MP4 to WebM is the fastest way to make your videos lighter for the web. MP4 (usually H.264) is highly compatible, while WebM is often smaller and ideal for modern browsers and performance-focused websites.
Use this conversion when you want faster page load, smaller downloads, or a modern web-friendly format for landing pages, blogs, or documentation portals. If you need universal playback on older devices, consider using WebM to MP4.
Best for
- Website embeds and SEO-friendly performance optimization
- Sharing smaller files with the same visible quality
- Modern browser-first workflows (Chrome, Edge, Firefox)
Technical notes
This tool runs FFmpeg in WebAssembly directly in your browser. Your file is processed locally (no server upload), then you download the result immediately.
Why use Client Tools?
- Privacy-First & Secure: All processing happens directly in your browser. We never upload your files to any server.
- Corporate Grade Security: Ideal for handling sensitive documents, contracts, and NDA-protected images. Since data never leaves your device, it is impossible for third parties to intercept it.
- No Limits: Convert as many files as you want, of any size (limited only by your device's RAM).
- Fast & Offline Capable: Works instantly without waiting for network uploads.
How it works
Unlike other converters that require you to upload your files to a cloud server (which creates a privacy risk), Client Tools uses advanced WebAssembly technology to run professional image processing software directly inside your web browser.