ASF to MOV Converter

Convert ASF to MOV 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 ASF file?

The Advanced Systems Format (ASF) is a proprietary digital audio and digital video container developed by Microsoft, serving as part of the Windows Media framework. It is designed for streaming media and uses a GUID-based object structure (Header, Data, and Index objects) to organize streams. ASF files typically contain Windows Media Audio (WMA) and Windows Media Video (WMV) codecs, though the container is codec-agnostic. The format supports Digital Rights Management (DRM) and extensible metadata via the Content Description Object.

How to open an ASF file

As a Microsoft-proprietary format, ASF files are natively supported on Windows operating systems via Windows Media Player and the Movies & TV app. macOS users generally cannot open ASF files without third-party components like Flip4Mac (discontinued) or universal players. The most reliable cross-platform solution for playing ASF containers without codec errors is the VLC media player, which supports the underlying WMA and WMV streams independently of the OS framework.

ASF Technical Info

Full Name: Advanced Systems Format
Developed By: Microsoft
Initial Release: 1996
MIME Type: video/x-ms-asf

What is a MOV file?

The MOV filename extension represents the QuickTime File Format (QTFF), a proprietary multimedia container developed by Apple Inc. It serves as the structural basis for the ISO/IEC 14496-14 (MPEG-4 Part 14) standard. The format utilizes an atom-based structure where data is organized into hierarchical units, allowing it to contain multiple tracks of video, audio, timecode, and text (subtitles). Common codecs encapsulated within MOV containers include Apple ProRes, H.264, and HEVC for video, and ALAC or AAC for audio. It is the default recording format for iPhones and iPads.

How to open a MOV file

MOV files are the native format for macOS and open directly in QuickTime Player. On Windows, native support is available in modern versions of Windows Media Player, though legacy support relied on the now-deprecated QuickTime for Windows. For cross-platform compatibility and to handle professional codecs like ProRes on non-Apple systems, VLC Media Player or Adobe Premiere Pro are the recommended tools.

MOV Technical Info

Full Name: QuickTime File Format
Developed By: Apple Inc.
Initial Release: 1991
MIME Type: video/quicktime

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Why RunConvert

The fastest way to convert any file

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

Convert ASF to MOV in seconds

Every ASF to MOV 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.

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Developer API

Convert ASF to MOV via API

Automate ASF to MOV 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": "asf-to-mov",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "mov"
      },
      "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.asf

# 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.