Convert many audio files in one go

How many files can I convert at a time?

Drop up to 20 files together, as long as they add up to 1 GB. Files beyond either limit are left out, and the page tells you how many. Mixed formats are fine, so a folder of MP3, M4A, OGG and WAV can go in as one batch. If you have more, finish this set and start another.

How do I convert multiple MP3 files?

1. Drop the files onto the page, or choose them together.
2. Pick one output format and quality. It is applied to every file in the list.
3. Press Convert all, then take each file or the whole set.

The list shows every file with its own state, so you always know which are waiting, running or done.

In what order are the files converted?

One after another, from the top of the list. Only one file is worked on at a time, never several together. Press Cancel and the run stops; the rows it had not reached are marked cancelled, and the finished ones keep their results.

What happens if one file fails?

Only that row fails, and the rest carry on. A damaged file, or a format the browser cannot open such as WMA, AIFF, AMR or AC3, is the usual cause. Use Retry on the row, or Remove to drop it from the batch.

How do I get all the converted files?

Each finished file has its own Download. Once two or more are done, a single Download all link gives you one ZIP of them, prepared for you automatically. The files live in this open tab, so closing it loses them: download before you leave.

Which format should the whole batch use?

MP3 suits most players, with Best at 320 kbps, Balanced at 192, Smaller at 128 and Voice at 64. WAV and FLAC are lossless containers, though a lossy source turned into either becomes bigger without regaining any detail. M4A and the iPhone ringtone appear only where your browser can encode AAC. Output is always 44.1 kHz. For a single file there is the audio converter, and to shrink a set for sharing, use compress audio. Before converting, trim a recording, or join several files into one track instead.