WebM to Y4M converter
A free WebM to Y4M converter for WebM files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your WebM files here
or browse your device · paste with Ctrl+V
Accepts .webm files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your WebM files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
Y4M is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your Y4M
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
WebM
WebMGoogle's royalty-free container built for HTML5 video, pairing VP8 or VP9 with Vorbis or Opus. Smaller than H.264 MP4 at matching quality, and supported by every current browser.
- Developed by
- Released
- 2010
- Extension
- .webm
- MIME type
- video/webm
- Compression
- Lossy
- Specification
- Open
Y4M
YUV4MPEG2Completely uncompressed raw frames behind a tiny text header. Used for codec testing and lossless intermediates; the files are enormous.
- Extension
- .y4m
- MIME type
- video/x-yuv4mpeg2
- Compression
- Uncompressed
- Specification
- Open
- WebM is lossy and Y4M is lossless. Re-saving cannot recover details removed by the lossy source. The output is usually larger with similar visible quality, not a repaired original.
Questions about converting WebM to Y4M
Is this WebM to Y4M converter free?
Yes. Converting WebM to Y4M here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my WebM file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for WebM to Y4M?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Does converting WebM to Y4M lose quality?
Nothing is intentionally discarded in this step, because Y4M is lossless. A WebM file encoded with lossy settings stays lossy, so missing detail is not recovered.
Can I convert several WebM files to Y4M at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does WebM to Y4M work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to Y4M
21 formats can become Y4M here.
Convert WebM to other formats
A WebM file can become any of these.
Y4M to WebM
The reverse conversion
WebM to MP4
WebM to MP3
WebM to WAV
Compress Video
Reduce a video's file size with a quality dial you c…
Discord Video Compressor
Free Discord compressor — shrink any clip under Disc…
Trim Video
Cut a clip out of a longer video.…
Video to GIF
Turn a clip into an animated GIF with a proper colou…