Convert MP4 to M4A Free

The catch with most "free" converters shows up at the end: the download needs an account, a watermark tone is mixed into the audio, or your file waits in a queue behind paying users. None of that applies here. The engine is the same one Pro uses — same speed, same bitrate options — and the output is clean and unmarked.

Free also means free of the usual hidden cost: your file. Many no-cost converters are free precisely because your upload is the product. Here the conversion runs in your browser, so the MP4 never leaves your device. Given that MP4 files usually come from phone video, recorded webinars and lectures, downloaded clips, and screen captures, that's worth more than the price.

The size drop is the point — around 50× less data, which is what turns an unsendable file into an attachment. You're stacking a second lossy generation. At a generous bitrate that's inaudible, but if you still have a lossless original, encode from that instead: one generation always beats two.

Free covers input files up to 20MB file size limit with a 10-second preview output, and 5 conversions per month. Pro removes those limits for full-length conversions up to 500MB file size limit — and the privacy behaviour is identical, because there was never a server in the loop.

Where does a MP4 file even come from? Usually phone video, recorded webinars and lectures, downloaded clips, and screen captures. The catch is that the video stream is nearly the entire file, so extracting the audio collapses a 500 MB video into a few MB. M4A is the destination because it plays essentially everywhere — iPhone Voice Memos and every ordinary phone, browser, and player. The size drop is the point — around 50× less data, which is what turns an unsendable file into an attachment. Both MP4 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 MP4 exists, encode the M4A from that instead.