Video Converter
Transcode between MP4, MOV, WebM and GIF - convert to and from any of them.
Drop a video here or click to browse
MP4, MOV, WebM or GIF - up to 100 MB, converted in memory.
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Image Converter
Swap between JPG, PNG, WEBP, GIF, TIFF, ICO, CUR, and BMP with full metadata control and instant previews.
Image Compressor
Fine-tune quality, chroma subsampling, and palette reduction for GIF/WebP while keeping visual fidelity.
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Remove XML metadata, strip comments, and collapse whitespace so SVG artwork ships faster.
Image Resizer
Resize by width, height, or DPI with contain, cover, or stretch modes and automatic sharpness preservation.
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Instant aspect-ratio templates with frictionless handles and pixel-level nudging.
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Adjust brightness, contrast, vibrance, and sharpness without downloading heavy desktop apps.
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Crop, resize, recolor, and layer images with an intuitive interface. All the essential tools you need for quick image edits.
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Choose a layout, set font and colors like in the image editor, then download or publish your meme.
Video Converter
Convert between MP4, MOV, WebM and GIF.
Video Trimmer
Cut a clip down to just the part you need.
Video Resizer
Scale a video down to 1080p, 720p and more.
Extract Audio
Save the soundtrack as MP3, AAC, FLAC or WAV.
Mute Video
Strip the sound and keep the picture untouched.
Image Converter
Swap between JPG, PNG, WEBP, GIF, TIFF, ICO, CUR, and BMP with full metadata control and instant previews.
Image to PDF
Create single-page PDFs with precise margins, orientation control, and auto-scaling canvas.
Direct links to every format pair we ship.
Rotate & Flip Image
Dial any angle, snap to 90° increments, and toggle horizontal or vertical mirroring.
Image Enhancer
Adjust brightness, contrast, vibrance, and sharpness without downloading heavy desktop apps.
Image Editor
Crop, resize, recolor, and layer images with an intuitive interface. All the essential tools you need for quick image edits.
Video Converter
Convert between MP4, MOV, WebM and GIF - transcoded in memory.
Video Trimmer
Cut a clip down to just the part you need.
Video Resizer
Scale a video down to 1080p, 720p and more.
Extract Audio
Save the soundtrack as MP3, AAC, FLAC or WAV.
Mute Video
Strip the sound and keep the picture untouched.
Direct links between MP4, MOV, GIF and WebM.
Browse what others have made or pick up where you left off.
A WebM to MP4 converter turns a web video into a universally playable one. The VP9 video and Opus audio inside the WebM are decoded and re-encoded as H.264 and AAC, then written into an MP4 container - the format that plays on effectively every phone, TV, editor and platform in use. Conversion runs server-side with ffmpeg entirely in memory and the upload is never written to disk.
What is a WebM to MP4 Converter?
WebM is an open container built for browser playback, normally holding VP9 video and Opus audio. MP4 is the ISO-standard container, normally holding H.264 and AAC. The two share nothing internally, so a WebM to MP4 converter performs a genuine transcode rather than a rewrap - both streams are decoded and re-encoded into the codecs MP4 expects.
WebM is excellent at what it was designed for, which is being delivered efficiently to a browser. Outside that context it runs into trouble constantly, and MP4 is the format that does not.
Why Convert WebM to MP4?
- It plays everywhere: phones, TVs, media players, editing software and upload forms all accept MP4. WebM is a browser format and behaves like one the moment it leaves the browser.
- Downloaded web video: saving a clip from a website frequently produces a WebM, and MP4 is what you need to actually use it elsewhere.
- Sharing with other people: sending a WebM to someone means gambling on whether their device opens it. MP4 removes the gamble entirely.
- Editing and uploading: most video editors handle MP4 natively, and many platforms, learning-management systems and submission forms accept MP4 only.
- Mobile playback: MP4 with H.264 is hardware-accelerated on essentially every phone, which means smoother playback and less battery drain than software-decoded VP9.
How Our WebM to MP4 Converter Works
Drop a WebM onto the upload card or click to browse. The target format is already set to MP4 on this page, so you can start the conversion straight away. A progress bar tracks the job from 0 to 100 percent while ffmpeg decodes the VP9 stream and re-encodes it, and the result plays inline with a download button when it finishes.
Files up to 100 MB are accepted, one at a time. The output is H.264 video with AAC audio, written with fragmented-MP4 flags so the file is playable as it streams rather than needing its index read up front.
Understanding the Technical Differences
These two formats have nothing in common internally. WebM is open and royalty-free, using VP9 and Opus, and was designed to be delivered efficiently over the web. MP4 is an ISO standard, using H.264 and AAC, and is implemented in hardware on almost every device manufactured in the last decade. Every layer changes in this conversion - container, video codec and audio codec alike.
Resolution, frame rate, aspect ratio, duration and the audio track all carry across unchanged. Expect the MP4 to be somewhat larger than the WebM you started with, because H.264 is less efficient than VP9 at the same visual quality. That is the trade: a bigger file that plays absolutely everywhere, rather than a smaller one that plays in browsers.
Related conversions: WebM to MOV for Apple editing workflows, MP4 to WebM to go the other way, and WebM to GIF for a looping animation.