Convert WMA to M4A Online

"Online converter" normally means uploading your file to someone's server, waiting in a queue, and downloading the result. This page inverts that: it loads FFmpeg compiled to WebAssembly into your browser and does the work on your own machine. You keep the convenience of online — nothing to install, works on any OS — without the upload.

File size stays in the same ballpark — both formats land around 1.2–1.2 MB per minute. That matters here, because transfer is where server-based converters spend most of their time. With no upload and no download of the result, what's left is just the conversion itself: usually a second or two.

WMA files typically come from CDs ripped in Windows Media Player during the 2000s, when it was the Windows default — and WMA has been abandoned — macOS, iPhones, most Android apps, car stereos and smart speakers all skip it. Both WMA and M4A are lossy, so this is a second-generation encode — it can't add anything back. Use 192 kbps or above and the extra loss stays inaudible.

Because it's a web page rather than software, the same converter runs on Windows, macOS, Linux, ChromeOS, iPhone, and Android — with nothing to keep updated and none of the bundled adware that comes with downloadable free converters.

WMA files come from CDs ripped in Windows Media Player during the 2000s, when it was the Windows default. WMA has been abandoned — macOS, iPhones, most Android apps, car stereos and smart speakers all skip it — which is the whole reason this conversion exists. M4A is the destination because it plays essentially everywhere — iPhone Voice Memos and every ordinary phone, browser, and player. File size stays in the same ballpark — both formats land around 1.2–1.2 MB per minute. Both WMA and M4A are lossy, so this pair stacks a second encode — at a generous bitrate it stays inaudible, but if a lossless original of the WMA exists, encode the M4A from that instead.