Audio Converter
Audio conversion decodes a file to raw samples and re-encodes them with a different codec. The important distinction is whether the target codec is lossy, which discards inaudible detail to save space, or lossless, which stores the waveform exactly.
Every audio converter here runs FFmpeg in your browser through WebAssembly, so your recordings — including private voice memos and unreleased music — never leave your device.
Most used audio converters
Audio tools
Operations that change a file without changing its format.
Compress Audio
Re-encode audio at a lower bitrate to save space.
Open toolTrim Audio
Cut audio down to the section between two timestamps.
Open toolMerge Audio
Join tracks end to end into one continuous file.
Open toolNormalise Audio
Even out loudness across a file using the EBU R128 standard.
Open toolAudio to Video
Wrap a track in a video file so it can be uploaded where only video is accepted.
Open toolAll audio conversions
72 supported conversions. Every one is a working converter, not a placeholder.
Audio formats explained
MPEG-1 Audio Layer III
.mp3
The universal lossy audio format.
Best for: Music players · Podcasts · Maximum compatibility
Waveform Audio
.wav, .wave
Uncompressed PCM audio. Perfect quality, big files.
Best for: Editing and mastering · Sound design · Archival
Free Lossless Audio Codec
.flac
Lossless compression — CD quality at roughly half the size.
Best for: Hi-fi music libraries · Archiving · Audiophiles
Advanced Audio Coding
.aac, .adts
The successor to MP3 — better quality per bit.
Best for: Streaming · Apple devices · Video soundtracks
MPEG-4 Audio
.m4a, .m4b
MP4 container holding AAC or ALAC audio.
Best for: iTunes and Apple Music · Audiobooks · Podcasts
Ogg Vorbis
.ogg, .oga
Open, royalty-free lossy audio.
Best for: Games · Open-source projects · Web audio
Opus Audio
.opus
The best low-bitrate codec available — voice and music.
Best for: Voice calls · Podcasts · Very small files
Audio Interchange File Format
.aiff, .aif, .aifc
Apple's uncompressed audio counterpart to WAV.
Best for: Pro audio on macOS · Mastering
Windows Media Audio
.wma
Microsoft's legacy audio format.
Best for: Old Windows music libraries
Adaptive Multi-Rate
.amr
Narrowband speech codec from mobile voice recordings.
Best for: Voice memos from older phones
Lossy and lossless audio
MP3, AAC, Opus and Vorbis are lossy: they model what human hearing can detect and discard the rest. At a reasonable bitrate this is genuinely difficult to hear, which is why almost all music distribution uses them.
WAV, AIFF and FLAC are lossless. FLAC compresses to roughly half of WAV's size while remaining bit-for-bit identical when decoded, which makes it the sensible choice for archiving.
The direction matters. Converting FLAC to MP3 is a normal, useful operation. Converting MP3 to FLAC produces a much larger file containing exactly the same degraded audio — it cannot restore what MP3 discarded.
Choosing a bitrate
For music in MP3, 192 kbps is a reasonable floor and 320 kbps is close to transparent for most listeners on most equipment. AAC and Opus achieve similar quality at lower bitrates because they are more modern codecs.
For speech — podcasts, interviews, voice memos — 96 kbps or even 64 kbps is usually indistinguishable, and Opus performs remarkably well at rates where MP3 falls apart.
Extracting audio from video
A video file already contains a separately encoded audio stream, so extraction means decoding that stream and writing it to an audio file. The quality ceiling is whatever the video contained — extracting to FLAC cannot add detail that was never there.
This is the most common audio task people have: turning a recorded lecture, interview or music video into something they can listen to without the picture.
FAQ