Free Online Audio Converter

ChangeThisFile supports MP3, WAV, FLAC, M4A, AAC, OGG, WMA, AIFF, and Opus. You can convert between any combination of these formats, covering both lossy and lossless audio.

Yes. Audio conversions upload your file to the server for processing with FFmpeg, then the file is auto-deleted immediately after conversion. Files are encrypted in transit and never stored or shared.

Lossy formats (MP3, AAC, OGG, Opus) compress audio by removing data that is less audible, resulting in smaller files with some quality loss. Lossless formats (FLAC, WAV, AIFF) preserve the full audio quality but produce larger files. For most listening, 256kbps MP3 or 128kbps Opus is indistinguishable from lossless.

FLAC is the best format for archiving music — it is lossless and widely supported. For portable listening, MP3 at 320kbps or AAC at 256kbps offers excellent quality with much smaller file sizes. Opus provides the best quality-to-size ratio among lossy formats.

Converting WAV to MP3 always involves some quality loss because MP3 is a lossy format. However, at 320kbps, the difference is imperceptible to most listeners in blind tests. If you need to preserve full quality, convert to FLAC instead.

Audio file conversions have a 25MB file size limit (free tier; 500MB on Pro). This covers most audio files — a typical 5-minute WAV file is about 50MB, and most MP3 or FLAC files are well under this limit.

Go to the M4A to MP3 converter page and drop your .m4a file. The conversion happens on the server using FFmpeg and typically completes in seconds. Your converted MP3 file downloads automatically.

Opus is a modern, open audio codec designed for both speech and music. It provides better quality than MP3 or AAC at the same bitrate, especially at lower bitrates. It is the default codec for WebRTC, Discord, and many streaming platforms.

Yes. You can extract audio from any video format (MP4, MOV, MKV, etc.) by using the video-to-audio conversion pages. For example, MP4 to MP3 extracts the audio track and converts it to MP3.