RM Compressor

Compress RealMedia (RM) video files. RM is a legacy streaming format from the RealPlayer era of the late 1990s.

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Supports: RM

OptionsAdvanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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File Compression
File size (%)
1
80
100
If your file is 10 MB, then selecting 80 will produce a 8 MB file. If you make the output file size too small, then output video quality may suffer.
Auto Scale
[Smart Scaling Active] We will automatically adjust the image dimensions to maximize quality while hitting your target file size. Manual resolution settings are hidden to prevent pixelation.
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How to Compress RM Files Online

  1. Upload Your RM Files: Click "+ Add Files" to select RealMedia (.rm) files from your computer, Google Drive, or Dropbox.
  2. Choose Compression Settings: Select compression method — quality preset (Highest to Lowest), target file size percentage, specific file size in MB, constant/variable bitrate, or CRF quality level. Optionally change resolution (1080p, 720p, 480p, percentage, or custom dimensions).
  3. Download Compressed Files: Click "Compress" and download your smaller RM files.

What Is RealMedia (RM)?

RealMedia is a proprietary multimedia format created by RealNetworks in the late 1990s. It was one of the first streaming video formats on the internet, designed for dial-up and early broadband connections. RM files use RealVideo and RealAudio codecs.

History of RealMedia

Year Milestone
1995 RealAudio 1.0 launched — first internet audio streaming
1997 RealVideo introduced for video streaming
1999-2003 Peak popularity — RealPlayer was the dominant media player
2005-2010 Declined as Flash video and YouTube took over
2010+ Effectively obsolete — replaced by MP4 and WebM

Why You Might Have RM Files

  • Archived internet video from the late 1990s and early 2000s
  • Old educational and training content
  • Archived radio broadcasts and podcasts
  • Content from early Chinese video websites (RM remained popular in China longer)

Frequently Asked Questions

Is it free?

Yes. Completely free with no sign-up required.

Can I play RM files on modern devices?

VLC Media Player is the best option for playing RM files on modern computers. Most phones and tablets can't play RM natively.

Should I compress or convert to MP4?

If you're archiving old RM content, converting to MP4 is recommended for long-term preservation. MP4 is universally supported and will remain playable for decades.

What's the difference between RM and RMVB?

RM uses constant bitrate (CBR) encoding. RMVB (RealMedia Variable Bitrate) uses variable bitrate for better quality at the same file size. Both are RealMedia formats.

Does it work on mobile?

Yes. Works in any modern browser on all devices — no app installation required.

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