How to convert Y4M to RM
To convert Y4M to RM, upload your Y4M file, choose RM as the output format and press Convert. The finished RM file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns Y4M videos into RM files in your browser, with no software to install and no watermark. When the video and audio inside your Y4M file can be placed in RM as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as RealVideo 1.0 (up to 480p) with AC-3 audio.
Why convert Y4M to RM?
- Tiny files for slow connections
- Plays in RealPlayer and VLC
- Historic format useful for old archives
- Plays on: RealPlayer, VLC and MPC-HC
What to expect from this conversion
- Expect a smaller file than the Y4M original, because RM compresses more efficiently.
- The only RealVideo encoder available is RealVideo 1.0, so RM output is limited to 480p and sizes that are a multiple of 16 pixels.
- Y4M files are huge because they are uncompressed, so uploads can take a while on slower connections.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
Y4M vs RM
| Property | Y4M | RM |
|---|---|---|
| Full name | YUV4MPEG2 | RealMedia |
| Released | 2000, MJPEG Tools / Xiph.Org | 1997, RealNetworks |
| Generation | Niche | Legacy |
| Typical file size | Huge | Small |
| Plays on | ffmpeg, x264, x265, aomenc, VLC and other video tools | RealPlayer, VLC and MPC-HC |
| Best for | benchmarking codecs; feeding raw video to encoders | old RealPlayer libraries; restoring early internet video |
Steps to convert Y4M to RM
- Drop your Y4M video file onto the converter, or click to choose it.
- Check that RM is selected as the target and adjust the options if you want.
- Press Convert, then download your new RM file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert Y4M to RM?
Upload your Y4M file, make sure RM is the selected target and press Convert. When the progress bar finishes, download the RM file. No account or software is needed.
Is the Y4M to RM converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting Y4M to RM?
Not necessarily. If the video and audio streams already fit inside RM, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Why is my RM file smaller than the Y4M original?
Expect a smaller file than the Y4M original, because RM compresses more efficiently. Choosing a lower quality or resolution reduces the size further.
Which devices can play RM files?
RM files play on RealPlayer, VLC and MPC-HC.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.