Upload a WMA file and get a MP3 back. No signup, no watermark, no limit on how many.
WMA is Microsoft's lossy format from the Windows Media era, and it is the reason a great many CD collections ripped between 2000 and 2010 are now awkward to play.
Where you run into it: Old Windows Media Player rips, corporate archives, CDs backed up on a PC two laptops ago.
What it costs you: Support outside Windows ranges from poor to none: phones, Macs and car stereos mostly will not open it, which is why it is nearly always a source and never a destination.
MP3 is the format that made portable music work, and thirty years on it is still the one every device, car stereo, DAW and browser will open without being asked twice.
Where you run into it: Downloads, podcast feeds, old music libraries, anything a client sends you and expects you to just play.
What it costs you: It throws audio away to get small, and at 320 kbps almost nobody can hear what went. What matters is that the discarded part never comes back.
WMA is nearly always a source on this site and never a destination, and this conversion is the reason: MP3 plays on everything, and WMA plays on Windows and increasingly little else. The audio is decoded and encoded again, so unless your file is WMA Lossless this is a second generation — the WMA encoder already discarded what it thought you would not miss, and the MP3 encoder now makes the same kind of judgement about what is left. That is the cost, and it is worth paying for a file that will actually open in ten years.
Check what you actually have before converting a whole collection, because the answer changes the setting. In Windows, the file's properties show the bit rate: a fixed 128 or 192 kbps is standard WMA, a variable figure in the hundreds is WMA Lossless, and WMA Voice sits far below both. Standard WMA at 128 is the common case and deserves Best or 256 kbps. And be prepared for the collection to be uneven — these libraries were usually ripped over several years at whatever the default was at the time.
Yes, entirely, and there is no cap on how many files you convert. No account, no watermark, no trial.
A little, and the bitrate you pick decides how much. Most WMA files in circulation are 128 kbps standard WMA from a Windows Media Player rip, which is a thin starting point, so matching that number in MP3 is where this conversion goes audibly wrong — the second encoder needs room that a matched bitrate does not give it. Take 256 kbps or Best instead. If your file is WMA Lossless nothing was ever discarded and the MP3 is a first generation, which is the one case where you can be relaxed about the setting.
Similar to slightly larger, which surprises people who expect a conversion to save space. To preserve what a 128 kbps WMA still holds you need an MP3 at a higher number than 128, so expect the file to grow by a third or so. Treat a noticeably smaller MP3 as a warning rather than a win: it means the rate you chose is below what the source was carrying.
Not here. WMA can be read but not written by this converter — ffmpeg decodes it happily, and encoding back to it would mean a format almost nothing plays. If you need the original WMA, keep it rather than recreating it.
The file is uploaded to do the conversion — nothing here runs in your browser — and both your upload and the converted result are deleted the moment the file is sent back. Nothing is stored and nothing is logged beyond the request itself.