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.
SVG Image Optimizer
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.
Image Cropper
Instant aspect-ratio templates with frictionless handles and pixel-level nudging.
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Dial any angle, snap to 90° increments, and toggle horizontal or vertical mirroring.
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Create single-page PDFs with precise margins, orientation control, and auto-scaling canvas.
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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.
Image Meme Generator
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.
An MP4 to WebM converter turns a standard video into a web-optimised one. The H.264 video and AAC audio inside the MP4 are decoded and re-encoded with VP9 and Opus, then written into a WebM container - the open format built specifically for delivering video in a browser. Conversion runs server-side with ffmpeg entirely in memory and the upload is never written to disk.
What is an MP4 to WebM Converter?
MP4 is the universal video container, normally holding H.264 video and AAC audio. WebM is an open, royalty-free container designed for the web, normally holding VP9 video and Opus audio. An MP4 to WebM converter genuinely re-encodes both streams into different codecs rather than simply rewrapping them, which is what separates this from a container-only conversion like MP4 to MOV.
That extra work is the point: VP9 compresses harder than H.264 and Opus is more efficient than AAC, so the resulting file is typically smaller at comparable quality.
Why Convert MP4 to WebM?
- Smaller files: VP9 usually produces a noticeably smaller file than H.264 at the same visual quality, which directly reduces bandwidth and page weight.
- Core Web Vitals: video is often the heaviest asset on a page. Serving WebM to browsers that support it, with MP4 as a fallback, is the standard way to cut that weight without losing anyone.
- Background and hero video: a muted looping clip behind a headline is exactly the case WebM was designed for - it has to be small, and it only has to play in a browser.
- Open and royalty-free: WebM carries no licensing attached, which matters for some projects and organisations in a way H.264 does not.
How Our MP4 to WebM Converter Works
Drop an MP4 onto the upload card or click to browse. The target format is already set to WebM on this page, so you can start the conversion straight away. A progress bar tracks the job from 0 to 100 percent, and the result plays inline with a download button when it finishes.
Files up to 100 MB are accepted, one at a time. Video is encoded with VP9 in constant-quality mode rather than at a fixed bitrate, so the encoder spends bits where the picture needs them instead of padding simple frames. Audio is re-encoded as Opus. VP9 is a slower codec than H.264, so expect this conversion to take longer than a container-only one - that additional analysis is what produces the smaller file.
Understanding the Technical Differences
The two formats differ at every layer. The container is the ISO-standard MP4 versus the open WebM. The video codec is H.264, universally supported and hardware-accelerated almost everywhere, versus VP9, which compresses better but is more demanding to encode and less widely accelerated in hardware. The audio codec is AAC versus Opus, which is more efficient particularly at lower bitrates.
Resolution, frame rate, aspect ratio, duration and the audio track all carry across unchanged. What you are trading is universal playback for efficiency: WebM plays in every current browser but has weaker support on older Apple devices, in some desktop video software, and on TVs and set-top boxes where MP4 would open without argument. For a web page WebM is the better target; for a file that has to work absolutely everywhere, MP4 already was.
Related conversions: WebM to MP4 to go the other way, MP4 to GIF for a looping animation, and MP4 to MOV for Apple editing workflows.