How to convert audio online
- Drop your file into the upload box — the converter shows its duration, sample rate and channel count.
- Choose the output format: MP3, 16-bit WAV or 32-bit float WAV, plus the MP3 bitrate if relevant.
- Optionally resample (48 000, 44 100 or 22 050 Hz) or mix stereo down to mono.
- Press Convert & Download — the finished file lands straight in your downloads.
This audio converter online does the whole job inside your browser: the file is decoded by your browser's own codecs, optionally resampled or mixed to mono, then encoded to MP3 or written as WAV by JavaScript running on your device. No upload queue, no email-me-the-result tricks, no size limits — a rare combination for a free converter, and the reason it works even on files you would never send to a random server.
Use it to shrink WAV recordings into shareable MP3s, turn FLAC or M4A files into universally compatible formats, prepare 44.1 kHz files for CD-style workflows, or make mono versions of stereo voice recordings. If your source is a video, extract the soundtrack first with Video to Audio.
FAQ
Which formats can this audio converter read and write?
Input: anything your browser can decode, which covers MP3, WAV, FLAC, OGG, M4A/AAC and the audio of most video files. Output: MP3 at 128 to 320 kbps, or WAV as 16-bit PCM or 32-bit float. It does not write FLAC or AAC — pick WAV when you need lossless output.
Are my files uploaded during conversion?
No. Decoding, resampling and MP3 encoding all run as JavaScript on your own device, and you can watch the encoding progress live. Nothing touches a server, which also means there is no file-size pricing and no privacy trade-off.
What is the best MP3 bitrate to choose?
320 kbps is the safest choice for music — most listeners cannot distinguish it from lossless. 192 kbps is a good size/quality balance for casual listening, and 128 kbps halves the size again, which suits speech and voice notes more than music.
Does converting MP3 to MP3 lose quality?
Yes, a little — every MP3 encode is lossy, so re-encoding an MP3 stacks a second generation of loss even at 320 kbps. It is usually inaudible once, but avoid repeated round-trips; convert to WAV instead when you plan to edit the file further.