MP3 to WMA Converter

Convert MP3 to WMA 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

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 MP3 file?

MPEG-1 Audio Layer III (MP3) is a lossy audio compression format defined by ISO/IEC 11172-3, developed by the Fraunhofer Institute. It uses perceptual coding based on psychoacoustic models to discard auditory data deemed imperceptible to the human ear, specifically utilizing the Modified Discrete Cosine Transform (MDCT) and Fast Fourier Transform (FFT). The format structures data into frames consisting of a header and data block, becoming the de facto standard for digital audio transfer in the 1990s.

How to open an MP3 file

MP3 playback is universally supported across all major operating systems (Windows, macOS, Linux, Android, iOS) without requiring additional codec installation. Native applications such as Windows Media Player, QuickTime, and Groove Music handle the format by default. Advanced users seeking spectral analysis or tag editing may utilize Audacity or Mp3tag.

MP3 Technical Info

Full Name: MPEG-1 Audio Layer III
Developed By: Fraunhofer Society
Initial Release: 1993
MIME Type: audio/mpeg

What is a WMA file?

Windows Media Audio (WMA) refers to a series of audio codecs and their corresponding Microsoft container format, designed as a competitor to MP3 and RealAudio. The standard WMA codec is lossy, but the format family includes WMA Lossless, WMA Pro (multichannel), and WMA Voice. It utilizes the Advanced Systems Format (ASF) container structure and supports digital rights management (DRM), which historically restricted playback to authorized Windows devices.

How to open a WMA file

WMA files are native to the Windows ecosystem and open by default in Windows Media Player and Movies & TV. macOS users require third-party components like Flip4Mac (legacy) or universal players such as VLC Media Player and Elmedia Player to decode the stream. Android and Linux support is generally provided via VLC or by installing ffmpeg-based media libraries.

WMA Technical Info

Full Name: Windows Media Audio
Developed By: Microsoft
Initial Release: 1999
MIME Type: audio/x-ms-wma

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Why RunConvert

The fastest way to convert any file

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

Convert MP3 to WMA in seconds

Every MP3 to WMA 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 MP3 to WMA via API

Automate MP3 to WMA 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": "mp3-to-wma",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "wma"
      },
      "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.mp3

# 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.