SWF to WEBM Converter

Convert SWF 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

or drag and drop files here

Maximum file size is 1GB

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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.

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.

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.

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 SWF file?

SWF (Small Web Format, originally Shockwave Flash) is a binary file format for multimedia, vector graphics, and ActionScript execution, originally developed by FutureWave Software and later acquired by Adobe Systems. It serves as the compiled delivery format for Adobe Animate (formerly Flash) and relies on the SWF file structure specification to define tags for display lists and control bytes. Adobe officially ended support (End of Life) for the Flash Player runtime on December 31, 2020, rendering SWF files obsolete for web use due to security vulnerabilities and the shift to HTML5 standards.

How to open an SWF file

Modern web browsers (Chrome, Edge, Safari) strictly block SWF execution. To open legacy SWF files, users must rely on the standalone Adobe Flash Player Projector (content debugger) or open-source emulators like Ruffle, which runs Flash content via WebAssembly. For video-only SWF files not relying on complex ActionScript interactivity, VLC media player can often decode the embedded video streams.

SWF Technical Info

Full Name: Small Web Format
Developed By: FutureWave / Macromedia / Adobe
Initial Release: 1996
MIME Type: application/x-shockwave-flash

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

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Why RunConvert

The fastest way to convert any file

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

Convert SWF to WEBM in seconds

Every SWF 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 SWF to WEBM via API

Automate SWF 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": "swf-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.swf

# 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.