WebM to MP4 Converter
WebM was born when Google acquired On2 Technologies in 2010 and open-sourced the...WebM was born when Google acquired On2 Technologies in 2010 and open-sourced the VP8 codec as a royalty-free alternative to H.264. Chrome, Firefox, an...
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Supported Formats
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Full Conversion Feature Set
One WebM in, one universal MP4 out
Why Use WebM to MP4 Converter?
Every Apple Device Finally Plays Your Video
Apple's Safari browser and iOS have historically lacked native WebM support. According to Apple's own January 2024 disclosure, there are over 2.2 billion active Apple devices worldwide, iPhones, iPads, Macs, and Apple TVs. A WebM file is effectively invisible to every one of them unless it is converted first. MP4 with H.264 is the format Apple's hardware decoders are built to accelerate, which means the converted file plays instantly with minimal battery drain on any Apple product.
H.264 Compression Shrinks VP8 Recordings Substantially
VP8, the older WebM codec, produces files roughly 30 to 50 percent larger than H.264 at equivalent visual quality according to comparative bitrate analyses published by the Moscow State University Video Quality Measurement Tool project. Converting a VP8-encoded WebM to H.264 MP4 at the high quality setting often produces a noticeably smaller file with identical perceived sharpness, a rare case where conversion actually saves storage rather than costing it.
The Format Every Social Platform and Email Client Expects
YouTube, Instagram, TikTok, Twitter, LinkedIn, and Facebook all list MP4 with H.264 as their recommended upload format. Gmail, Outlook, and Apple Mail embed MP4 video previews inline but treat WebM as a generic download. Converting before uploading or sending eliminates re-encoding on the platform side and guarantees the recipient sees your video exactly as you intended, no quality loss from double compression.
Screen Recordings and WebRTC Captures Made Shareable
Chrome's built-in screen recorder, WebRTC-based recording tools like OBS Browser Source, and browser extensions frequently output WebM by default because it is the native web codec. The result is a file that plays perfectly in Chrome but breaks the moment you try to share it with someone on an iPhone, embed it in a PowerPoint presentation, or upload it to a learning management system. Converting to MP4 makes the recording universally shareable.
Why People Convert WebM to MP4
Sharing Screen Recordings With iPhone Users
You recorded a product demo or a bug report using a browser-based screen recorder, which saved it as WebM. Your colleague opens it on their iPhone, nothing happens. Converting to MP4 before sharing guarantees the recording plays instantly on any Apple device without asking the recipient to install a third-party video player.
Uploading WebRTC Conference Recordings to Cloud Platforms
Video conferencing tools built on WebRTC sometimes export recordings as WebM. Learning management systems, Google Drive video preview, and corporate intranets often require MP4 for inline playback. Converting the recording ensures everyone in the organization can watch it directly in the browser without downloading or transcoding on their end.
Embedding Video in PowerPoint or Keynote Presentations
Microsoft PowerPoint and Apple Keynote support embedded MP4 video but handle WebM poorly or not at all. If your presentation includes a product walkthrough or a demo clip, converting from WebM to MP4 ensures the video plays smoothly during the presentation regardless of whether the audience is on Windows or macOS.
Sending a Playable Video Preview via Email
Gmail, Outlook, and Apple Mail render inline MP4 previews so the recipient can watch the video without downloading. WebM attachments appear as generic files that require a separate download and a compatible player. Converting before attaching gives the recipient a seamless viewing experience the moment they open the email.
How It Works
Upload the WebM File From Your Device
Drag the WebM into the upload zone or tap to open the file browser. Files up to two gigabytes are accepted. The tool handles both VP8 and VP9 encoded WebM files, the server detects the internal codec automatically and decodes it before re-encoding regardless of which Google codec was used during the original capture.
Choose the Quality Level for the MP4 Output
Select high quality to preserve maximum visual detail, ideal for archiving or uploading to YouTube at the best tier. Choose medium for a balanced trade-off between file size and clarity. Choose low for the fastest conversion and smallest output, which is practical when the video is destined for a messaging app with upload limits or an email attachment.
Convert and Download the Universal MP4
Press Convert to MP4 and wait while the server processes the video. Download the finished file and open it on any device, iPhone, Android, Windows, macOS, Smart TV, or game console. Upload it to any social platform, embed it on a website, or share it in a group chat. The days of 'format not supported' are over.
Getting the Best Conversion Results
Choose High Quality Unless File Size Is the Priority
The high setting allocates more bits per frame and produces the clearest output. The file size difference compared to medium is modest, typically 20 to 30 percent larger, but the visual clarity on large screens is noticeably better. Reserve low for email attachments and messaging apps with strict upload caps.
VP9 Sources Already Have Good Compression, High Quality Preserves It
VP9 is a more efficient codec than VP8, so the source file is already well-compressed. Converting at high quality ensures the H.264 output matches the VP9 original as closely as possible. Dropping to low quality on a VP9 source can introduce visible artifacts that were not present in the original.
Convert Then Compress If the MP4 Is Still Too Large
If the resulting MP4 exceeds the upload limit of your target platform, run it through our Video Compressor afterward. Converting first gives the compressor a clean H.264 stream to work with, which produces better compression results than compressing directly from WebM.
Trim Before Converting If You Only Need Part of the Video
Converting an entire two-hour recording when you only need a five-minute segment wastes time and bandwidth. Use Video Trimmer on the WebM first to extract the section you want, then convert the shorter clip to MP4.
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