RunConvert
Sign In

RM to WEBM Converter

Convert RM to WEBM online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

Like RunConvert? Set us as a preferred source on Google.

Add to Preferred Sources

How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

01

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

02

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

03

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an RM file?

RealMedia (RM) is a multimedia container format created by RealNetworks for streaming content over the Internet. Introduced in the mid-1990s, it typically encapsulates audio compressed with RealAudio and video utilizing RealVideo proprietary codecs. The format relies on the Real Time Streaming Protocol (RTSP) to manage data delivery, allowing media to play while downloading. RM files support Variable Bit Rate (VBR) encoding, enabling the adjustment of data density based on content complexity to optimize bandwidth usage, though it has largely been superseded by MP4 and modern streaming protocols.

How to open an RM file

Native support for RM files is absent in modern Windows, macOS, and Linux operating systems due to the format's proprietary nature and obsolescence. While the legacy RealPlayer software is the original playback utility, the open-source VLC media player is the standard recommendation for modern systems, as it integrates the necessary FFmpeg libraries to decode RealVideo and RealAudio streams without requiring additional codec packs.

RM Technical Info

Full Name
RealMedia
Developed By
RealNetworks
Initial Release
1995
MIME Type
application/vnd.rn-realmedia

What is a WebM file?

WebM is an open, royalty-free audiovisual media file format sponsored by Google, derived from the Matroska (MKV) container. Designed specifically for the HTML5 video element, it restricts streams to specific codecs: video is compressed using VP8, VP9, or AV1, while audio utilizes Vorbis or Opus. The format structure is defined by a subset of the Matroska specifications, prioritizing efficiency for web streaming and low computational overhead for decoding in browser environments.

How to open a WebM file

As a native HTML5 format, WebM files open directly in modern web browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, and Opera without plugins. For offline playback, cross-platform media players like VLC media player, MPV, and FFmpeg-based tools provide full support. Windows Media Player may require the installation of WebM Media Foundation Components to render these files.

WebM Technical Info

Full Name
Web Media
Developed By
Google
Initial Release
2010
MIME Type
video/webm

More tools

Related conversions

RM to AAC

RM to AIFF

RM to AVI

RM to FLAC

RM to FLV

RM to M4A

RM to MKV

RM to MOV

Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert RM to WEBM in seconds

Every RM to WEBM conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert RM to WEBM via API

Automate RM to WEBM conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "rm-to-webm",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "webm"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.rm

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.