WebM to MP4

MP4 with H.264 codec is accepted by virtually all devices, operating systems, and applications, while WebM format may fail on older iPhones, Safari browsers (especially on iOS), some Smart TVs, legacy media players, and certain video editing software. Converting WebM to MP4 ensures smooth playback everywhere - on mobile devices, desktop computers, tablets, gaming consoles, streaming devices, and web browsers. MP4 is the industry standard format for video distribution, making it ideal for sharing videos via email, uploading to social media platforms, embedding in websites, storing in cloud services, or archiving for long-term use. If you need maximum compatibility and want your videos to play on any device your audience might use, MP4 is the reliable choice.

Yes, our conversion process uses a smart Variable Bitrate (VBR) H.264 encoder that intelligently preserves visual detail while optimizing file size. The encoder analyzes your WebM source and applies adaptive bitrate encoding to maintain high quality throughout the video, allocating more bits to complex scenes and fewer bits to simpler frames. For near-lossless results that closely match your original WebM quality, choose a higher bitrate in "Advanced settings" - this will create larger files but preserve maximum visual fidelity. The default settings provide an excellent balance between quality and file size, suitable for most use cases. If you need professional-grade quality for editing or archival purposes, increase the bitrate accordingly.

Yes, the audio track is automatically converted during the process. Opus or Vorbis audio codecs from the WebM file are transcoded to AAC (Advanced Audio Coding), which is the standard audio format for MP4 files. AAC provides excellent audio quality at lower bitrates and is universally supported by all media players, devices, and platforms. This ensures your converted MP4 will play audio correctly on every device - from iPhones and Android phones to Windows Media Player, VLC, and all modern browsers. The audio conversion maintains the original quality while ensuring maximum compatibility, so you'll hear clear, crisp sound on any device that plays your MP4 video.

Absolutely. After uploading your WebM file, you can lower the resolution or bitrate in Advanced settings to generate a lighter MP4 file that fits under common email attachment limits (typically 25 MB for most email providers like Gmail, Outlook, and Yahoo). Reducing the resolution (e.g., from 1080p to 720p or 480p) or lowering the bitrate will significantly decrease file size while still maintaining acceptable quality for viewing. This is perfect for sharing videos via email, sending to colleagues or clients, or uploading to platforms with file size restrictions. The Advanced settings give you full control over the output file size, allowing you to create the perfect balance between quality and file size for your specific needs.

Standard H.264 MP4 format does not support alpha channel transparency. If your WebM file has transparency (alpha channel) and you need to preserve it, you have two options: keep the file in WebM VP9-alpha format (which supports transparency), or export as MOV ProRes 4444 format (which also supports alpha channels). However, if you convert a transparent WebM to standard MP4, the transparent areas will be filled with black or another solid color. For most use cases where transparency isn't required, MP4 is the better choice due to its universal compatibility. If transparency is essential for your project (such as overlays, graphics, or compositing), consider keeping the WebM format or using ProRes 4444 for professional video editing workflows.

You can upload WebM videos up to 2 GB per file for conversion. Larger video projects should be trimmed or compressed locally before upload to ensure faster processing and smoother conversion. The conversion time depends on factors such as file size, video resolution, codec complexity (VP8 vs VP9), and selected encoding settings. For very large files, consider splitting them into smaller segments, trimming unnecessary parts, or using video editing software to optimize the source material first. All files are processed securely using encrypted HTTPS connections, and larger files receive the same level of privacy protection and automatic deletion as smaller ones.

Your files are completely secure during the conversion process. All file transfers use encrypted HTTPS connections to protect your data during transmission from your device to our servers. Files are processed securely in volatile memory (RAM) only and are automatically deleted from our servers within minutes after conversion completion. We never store downloaded content permanently, share your files with third parties, or access your media beyond the conversion process. This ensures complete privacy and security for all your video content - your files remain yours alone, with no permanent storage, tracking, or data retention. Enterprise-grade security for your sensitive video files.