MP4 to WebM

WebM offers several key advantages: superior compression efficiency that can reduce file sizes by up to 50% compared to H.264 MP4, royalty-free licensing that eliminates patent fees and legal concerns, and native playback support in all modern browsers without requiring extra codecs or plugins. This makes WebM ideal for web developers, CMS platforms, website owners, and content creators who want to optimize video delivery, reduce bandwidth costs, improve page load speeds, and ensure broad browser compatibility. WebM is particularly valuable for HTML5 video embedding, email marketing, and web-based video streaming applications.

The choice depends on your target audience and quality requirements. VP9 delivers significantly higher quality at lower bitrates, offering better compression efficiency and smaller file sizes, but requires newer browsers (Chrome 29+, Firefox 28+, Edge 79+). VP8 is slightly larger in file size but provides broader compatibility, supporting older browsers and devices. For modern web applications targeting current browsers, VP9 is recommended for optimal quality and file size. For maximum compatibility including legacy systems, VP8 is the safer choice. You can also serve both formats using HTML5 multiple source tags for the best of both worlds.

Yes, WebM with VP9 codec fully supports alpha channel transparency. Enable "Transparency" in Advanced settings to export WebM with a clear background, allowing you to overlay videos on other content, create picture-in-picture effects, or integrate videos seamlessly into web designs. This is perfect for web developers creating interactive experiences, motion graphics designers, and content creators who need videos with transparent backgrounds for compositing or overlay effects. Note that VP8 does not support alpha channels, so VP9 is required for transparency features.

Video quality depends on the bitrate you choose. The default auto-bitrate setting provides a balanced result that optimizes both file size and quality. For near-lossless output that closely matches your source video, raise the bitrate in Advanced settings. VP9 codec is particularly efficient, often delivering better quality than H.264 at the same bitrate, or equivalent quality at lower bitrates. Higher bitrates preserve more detail but increase file size, while lower bitrates reduce file size but may introduce some quality loss. For web delivery, the default settings usually provide an excellent balance.

Safari on macOS 11+ (Big Sur and later) supports VP9 WebM natively. However, older Safari versions and iOS browsers (including current iOS Safari) do not support WebM and require an MP4 fallback. For maximum compatibility across all platforms, consider serving both formats using the HTML5 <source> tag, which allows browsers to automatically select the format they support. This ensures your videos play on all devices - WebM for modern browsers (Chrome, Firefox, Edge) and MP4 for Safari and iOS devices. This dual-format approach is the recommended best practice for web video delivery.

You can upload files up to 2 GB per conversion. Larger video projects should be trimmed or down-scaled before upload to ensure smooth processing. The conversion time depends on factors such as file size, video resolution, codec complexity, and selected encoding settings. All files are processed securely using encrypted HTTPS connections, ensuring your media remains private throughout the conversion process. For very large files, consider splitting them into smaller segments or using video editing software to optimize the source material first.

Your privacy and security are our top priorities. All file transfers use encrypted HTTPS connections to protect your data during transmission. Files are processed securely in volatile memory (RAM) and are automatically deleted from our servers within minutes after conversion completion. We never store, share, or access your media files beyond the conversion process, ensuring complete privacy and security for all your video content. Your files remain yours alone, with no permanent storage or third-party access.