Convert MP3 to WMA
Feed the old Windows Media player or the picky car stereo the format it actually wants — converted on your own device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
WMA survives in hardware: car head units from the 2000s, portable players that predate smartphones, old Windows CE devices, and some voice systems that were built on Windows Media and never moved on. When one of those rejects your MP3, this converter re-encodes it to Windows Media Audio in your browser — no upload, no software install, and the output keeps your file's original name.
Worth knowing before you convert: MP3 to WMA is a lossy-to-lossy re-encode, so a small amount of quality is spent in the translation — at the 128 kbps output rate it is rarely audible on the car and portable hardware this format serves, but archiving your music in WMA gains you nothing. Convert the files the device needs, keep your MP3s as the originals.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
What devices still need WMA?
Mostly hardware from the 2000s: car stereos and head units that list WMA on the faceplate, portable media players from that era, and old Windows-based kiosks or phone systems. Modern devices play MP3 universally — convert only when the hardware demands it.
Does converting MP3 to WMA improve quality?
No — it can only preserve or slightly reduce it, because both formats are lossy and the audio is decoded and re-encoded. This tool exists for device compatibility, not quality; keep your MP3s as the master copies.
What bitrate does the WMA use?
128 kbps Windows Media Audio — the sweet spot the WMA-era hardware was designed around, and comfortably transparent on car and portable speakers of that generation.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.