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Your car stereo wants MP3, your editor wants WAV and your phone records M4A. Drop in one file or a whole folder, pick the format, and download the converted copies with their titles, artists and album art intact. Everything runs on your own device.
Processing locally on your device
Overview
Converting audio means decoding the source into raw samples and encoding those samples in a different codec. This converter uses FFmpeg compiled to WebAssembly and reads each original file directly from your disk, rather than first unpacking it into a huge uncompressed copy in memory. That keeps hour-long recordings and big batches manageable, and it lets FFmpeg carry the file’s metadata across. The engine is a one-time download of about 31 MB; after that it is cached and works offline.
Seven output formats are available. MP3 offers LAME VBR presets (V0, V2, V4) or constant bitrates from 96 to 320 kbps. M4A uses AAC at 96–256 kbps. OGG uses Vorbis quality levels 3–8, and Opus runs from 32 to 192 kbps. FLAC is lossless and usually 50–60% of the size of WAV. WAV and AIFF are uncompressed PCM at 16-bit or 24-bit; AIFF is stored big-endian, which is what Logic Pro and other Mac software expect. You can also resample to 48, 44.1, 32, 22.05 or 16 kHz and mix down to mono or keep stereo.
Tags such as title, artist, album, year and track number are carried over to every format that supports them, including Vorbis comments in OGG and Opus files and RIFF INFO chunks in WAV. Embedded cover art is kept when converting to MP3, M4A or FLAC; WAV, AIFF, OGG and Opus outputs keep the tags but leave the picture out. Video files work too: the converter ignores the picture track and saves only the soundtrack, so an MP4 or MOV becomes an MP3 or WAV in one step.
When a file is already in the target codec, for example AAC audio inside an MP4 converted to M4A, the converter can copy the audio stream instead of re-encoding it. That is instant and bit-for-bit lossless. Otherwise, remember the basic rule: converting a lossy file (MP3, AAC, Vorbis) to a lossless one (FLAC, WAV) makes it bigger but cannot restore detail that was already thrown away, and converting between two lossy formats adds a second generation of compression.
| Format | Type | Typical size per minute (stereo) | Cover art | Best for |
|---|---|---|---|---|
| MP3 | Lossy | 1.4 MB at 192 kbps | Yes | Universal playback, car stereos |
| M4A (AAC) | Lossy | 1.4 MB at 192 kbps | Yes | Apple devices, video soundtracks |
| Opus | Lossy | 0.7 MB at 96 kbps | No | Voice, web and messaging apps |
| OGG Vorbis | Lossy | 1.2 MB at quality 5 | No | Games, open-source players |
| FLAC | Lossless | About 5–6 MB | Yes | Archiving music |
| WAV | Uncompressed | 10.1 MB at 16-bit/44.1 kHz | No | Editing, Windows apps |
| AIFF | Uncompressed | 10.1 MB at 16-bit/44.1 kHz | No | Logic Pro, Mac apps |
Drop one or more audio or video files onto the converter, or click to browse.
Choose the output format: MP3, M4A, WAV, FLAC, OGG, Opus or AIFF.
Pick a quality, bitrate or bit depth, and optionally a new sample rate or mono output.
Leave Keep tags and Keep cover art on to carry your metadata across.
Click Convert and download each file, or all of them as a ZIP.
Use cases
Turn FLAC, Opus or M4A files into MP3, which practically every car head unit, MP3 player and smart speaker made in the past twenty years can play. The album art comes along, so it still shows on the dashboard screen.
Convert phone voice memos, WebM recordings or OGG files to 24-bit WAV or AIFF so they open in Audacity, Premiere, Logic or Pro Tools without plugins or conversion prompts.
Save the soundtrack of a lecture, interview or concert video as an MP3 for listening on the go. If the video’s audio is already AAC, choosing M4A copies it without any quality loss.
Convert WAV rips to FLAC to save roughly 40–50% of the space while keeping every sample, plus the tags and cover art your library software relies on.
Pro tips
Answers to common questions about the audio converter.
No. The detail removed by MP3 encoding is gone for good. A WAV or FLAC made from an MP3 sounds identical to the MP3; it is only larger. It is still useful when an editor or device needs an uncompressed file.
MP3, M4A and FLAC outputs keep embedded artwork. WAV, AIFF, OGG and Opus files are converted with their text tags, but the picture is left out, because those containers have no widely supported way to store it in this converter.
If a file’s audio already uses the target codec, for example an MP3 converted to MP3 or AAC audio converted to M4A, the stream is copied unchanged instead of being decoded and re-encoded. It is near-instant and lossless, but the quality setting is ignored for those files.
It depends on your processor and the format. Encoding to MP3, AAC or Opus in the browser typically runs many times faster than real time, so a four-minute song usually takes somewhere between a few seconds and half a minute. WAV, AIFF and FLAC are faster still. The first run also downloads the 31 MB engine.
Yes. Drop an MP4, MOV, MKV, WebM or AVI file and choose MP3 or any other format. Only the first audio track is converted; the video picture is ignored, so the result is a normal audio file.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The audio converter is free to use with no sign-up, no watermarks and no daily limits.