Bulk Convert WMA to MP3 Online — Universal Compatibility

Convert legacy Windows Media Audio to universally compatible MP3 format.

Drop up to 50 files at once — no install, no sign-up required.

Drop WMA Files Here

50 MB or 2 hours per file Up to 50 files (2 GB limit) 3 parallel conversions 1 credit per 5 minutes

Encrypted EU Servers Auto-delete 1h

⚡ Median WMA → MP3 time (last 10k jobs): 742ms per minute

How it works

1 · Drop your files
Drag & drop or choose WMA files. No account required—paid plans unlock bigger batches, higher limits, and priority queues.
2 · We convert securely
Processed on our dedicated servers. Encrypted in transit & at rest. We never store filenames—only file types & sizes for accounting.
3 · Download & auto-delete
Grab your MP3 files in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.

About WMA →

WMA (Windows Media Audio) is Microsoft's proprietary audio codec family, introduced in 1999 as part of the Windows Media framework. WMA Standard uses lossy compression comparable to MP3, while WMA Pro adds surround sound and higher bit depths, and WMA Lossless preserves perfect audio quality. WMA files were the default format for Windows Media Player and early Microsoft portable devices.

Learn more: WMA on Wikipedia

While WMA offered competitive quality in its era, the format has largely been superseded by more universal standards. Converting WMA to MP3 ensures compatibility with all modern devices and platforms. Note that DRM-protected WMA files purchased from legacy stores cannot be converted—the encryption prevents any third-party processing.

About MP3 →

MP3 (MPEG-1 Audio Layer III) revolutionized digital audio when it was standardized in 1993 by the Fraunhofer Society. Using psychoacoustic compression, MP3 removes audio frequencies that humans typically cannot perceive, achieving 10:1 compression or better while maintaining excellent subjective quality. MP3 supports sample rates from 8-48 kHz and 16-bit audio. At 256 kbps, most listeners cannot distinguish MP3 from the original source in blind tests.

Learn more: MP3 on Wikipedia

MP3 remains the most universally compatible audio format, supported by every music player, smartphone, computer, and web browser. While newer codecs like AAC and Opus offer marginally better compression efficiency, MP3's ubiquitous support makes it the safest choice for sharing audio. The format's patents expired in 2017, making it completely free to use without licensing concerns.

Frequently Asked Questions

What is the difference between WMA and MP3?

WMA (Windows Media Audio) is Microsoft's proprietary codec developed in 1999. MP3 is the universal standard for compressed audio. While WMA offered competitive quality in its era, MP3 is now supported by every device, browser, and music player—making it the safer choice for sharing audio.

Will converting WMA to MP3 reduce audio quality?

Transcoding between lossy formats does result in some quality loss. Since both WMA and MP3 use lossy compression, converting re-encodes the audio. We encode at 320 kbps CBR to maximize quality. For critical audio, keep the original WMA or use WMA to WAV for lossless extraction.

Why should I convert WMA to MP3?

Compatibility. WMA files may not play on iPhones, Android devices, game consoles, or in web browsers. MP3 works everywhere. Converting your WMA library to MP3 ensures your music plays on any device without issues.

What about DRM-protected WMA files?

DRM-protected WMA files cannot be converted. Music purchased from legacy stores like MSN Music or early Zune Marketplace may have Windows Media DRM. Our converter automatically detects DRM and shows a clear error message. There's no way to bypass this protection.

What quality settings do you use?

We encode at 320 kbps CBR (constant bitrate) using high-quality LAME encoding. This is the highest practical MP3 quality and preserves as much audio fidelity as possible from the source WMA file.

Can I convert WMA Lossless to MP3?

Yes, but consider WAV first. If your WMA files are WMA Lossless, they contain uncompressed audio. Converting to MP3 will apply lossy compression. For archival purposes, extract to lossless WAV first, then create MP3s from that master.

How long can my audio files be?

Duration limits depend on your plan: Guest/Free: 120 minutes, Pro: 3000 minutes (50 hours). This accommodates everything from songs to full audiobooks.

What are the limits for this converter?

Tier	Max File Size	Max Files/Batch	Parallel Processing
Guest/Free	50 MB	50 files	3 at once
Pro	2048 MB	1000 files	6 at once

Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →

How are credits calculated for this conversion?

Cost: 1 credit per 5 minutes

How it works:

Files up to 5 minutes: 1 credit
6-10 minutes: 2 credits
11-15 minutes: 3 credits
16-20 minutes: 4 credits

Example: A 10-minute file = 2 credits. A 180-minute (3h) audiobook = 36 credits.

Why per-minute? Audio conversion time scales with content duration, not file size. Longer audio requires proportionally more processing.

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

Tier	Daily Limit	Monthly Limit
Guest	100 credits/day	—
Free	100 credits/day	—
Pro	—	12,000 credits/month

Daily credits (Guest & Free tiers) reset every day at midnight UTC. Monthly credits (Pro) reset on your billing cycle date.

Note: With 1 credit per 5 minutes, audio files under 5 MB cost 1 credit each. Pro users can convert 12,000 audio files per month.

Answers at a Glance

Quick answers to common questions.

What's New in WMA to MP3

Latest improvements to this converter

Last updated January 28, 2025

Jan 28, 2025

Initial release of WMA to MP3 converter with DRM detection and real-time progress.

Need to get more done? Pro starts from $5.

1 GB files 1,000 per batch Priority queue Web + API

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