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Convert M4A to WAV Online Free

Every audio app opens WAV. Tell us which one you're using.

M4A comes from iPhone Voice Memos, Apple Music downloads and GarageBand. Editors, CD burners and hardware samplers want plain WAV, often at a specific sample rate. Pick the destination and we'll match it.

graphic_eqAudacity or GarageBandedit and export again44.1k · 24-bit

movie_editPremiere, Resolve, Final Cutaudio for a video timeline48k · 24-bit

albumBurning an audio CDRed Book standard44.1k · 16-bit

pianoHardware samplerSP-404, MPC, Digitakt44.1k · 16-bit

record_voice_overTranscription serviceupload for speech-to-text44.1k · 16-bit

New Recording 14.m4aAAC · 256 kbps · 44.1 kHz

AAC inside (most files)ALAC inside (lossless)

sample rate

44.1 kHzCD48 kHzrecommended96 kHzhi-res

bit depth

16-bitCD, most apps24-bitrecommended32-bit floatmixing

check_circleVideo projects run at 48 kHz. Matching it now avoids a resample and possible drift later. The 44.1 → 48 kHz resample is done once, with high-quality filtering.

M4A4.4 MBWAV · 4:1273 MBgrowth×16.5

graphic_eqConvert to WAV

Open songs, voice memos or old archives and save them as MP3, AAC, FLAC, Opus, WMA, AC3, AMR or any of 19 more. Pick a quality preset or an exact bitrate, convert the whole batch in one pass, then download each file or one ZIP.

library_addAdd audio filesmusic_noteTry a sample track

lockFiles stay on your devicelibrary_music26 output formatsstacksBatch convert, one ZIPtunePresets or an exact bitrate

Your files1 file · 2.12 MB

upload_fileDrop audio files hereMP3, WAV, FLAC, M4A, OGG, OPUS, WMA, AIFF, AMR, AC3 and more. Add as many as you like; they convert one after another.

WAVharbour-lights.wav12.0 s · 2.12 MBdownloadwaitingclose

swap_horizConvert 1 file to .mp3folder_zip

The engine could not load: could not fetch http://127.0.0.1:9777/js/lib/ffmpeg.min.js

1Save as26 formats

.mp3.m4a.wav.flac.opus

searchAll 26 formatsexpand_more

. ·

.mp3MP3

MPEG-1 Audio Layer III, the universal standard. Best for music, podcasts and sharing.

Containermp3Encoderlibmp3lameMIME typeaudio/mpegFirst bytes49 44 33 or FF FBHerechecked when the engine loads

2Qualitylossy · smaller

Low96 kbps · 44.1 kHz · mono

Medium128 kbps · 44.1 kHz · stereo

High192 kbps · 48 kHz · stereo

Ultra320 kbps · 48 kHz · stereo

Customset it yourself

Bitrate

Bit depth

Sample rate

Channels

infoEach preset sets bitrate, sample rate and channels together. MP3 at 192 kbps is the usual choice for music.

3What you’ll get≈ 288 KB in total

harbour-lights.wav2.12 MB≈ 288 KB

The exact command each file goes throughffmpeg -i harbour-lights.wav -vn -map_metadata 0 -ar 48000 -ac 2 -c:a libmp3lame -b:a 192k -f mp3 harbour-lights.mp3

swap_horizConvert 1 file to .mp3

~/two-things-called-m4a

Same extension, opposite insides.

Most M4As hold AAC, a lossy codec like MP3. Some hold ALAC, Apple's lossless format. We read which one before converting. The WAV will be as good as what's inside, never better.

AAC in M4Alossy

0 Hzcut at ~16 kHz22 kHz

typical sourceVoice Memos, iTunes Store, podcastssize per minute≈ 1-2 MBWAV resultplays and edits anywhere; no quality regained

Frequencies above about 16 kHz were thrown away when the AAC was made. The WAV keeps exactly what’s left, so it’s ready to edit without any further loss.

ALAC in M4Alossless

0 Hzfull range22 kHz

typical sourceApple Music lossless, CD rips in Musicsize per minute≈ 5-7 MBWAV resultbit-for-bit identical sound

Nothing was ever removed. Decoding ALAC to WAV gives back exactly the original samples, just without the compression.

~/the-click-at-the-loop

AAC hides a sliver of silence at the start.

The AAC encoder needs 2,112 warm-up samples, about 48 ms, before the real audio begins. Players skip it using a hidden note in the file. Many converters don't, so loops stutter and synced audio drifts. We read the note and trim it exactly.

Naive decodeGapless trim (ours)

drum loop, played twice back to back

leading silence48 mssamples+2,112sync after 10 loops0.5 s late

The red gap is the encoder’s warm-up silence. You hear it as a hiccup every time the loop restarts, and it pushes the audio later against the picture.

~/how-big

WAV is big, and the settings multiply it.

WAV stores every sample uncompressed. Doubling the sample rate or going from 16 to 24 bits scales the file directly. Drag the length to size your recording.

length1 h

44.1 kHz48 kHz96 kHz16-bitCD, most apps635 MB691 MB1.4 GB24-bitediting953 MB1.0 GByour settings2.1 GB32-bitfloat · mixing1.3 GB1.4 GB2.8 GB

~/other-routes

When WAV is more than you need.

Neighbouring conversions for the same M4A.

music_noteM4A to MP3For car stereos and old players that don’t read M4A. Small, and plays everywhere.Recording 14.m4aarrow_forwardRecording 14.mp3 compressAudio compressorNeed to email a long recording? Aim for a size limit instead.interview.m4a · 60 MBarrow_forward12 MB graphic_eqWAV to FLACArchive the WAV at half the size, still lossless.master.wav · 44 MBarrow_forwardmaster.flac · 25 MB

Sources

[1]Apple Lossless (ALAC)Apple’s open-source lossless codec.Apple / GitHub ↗[2]AAC encoder delay and gapless playbackWhy AAC adds priming samples and how players remove them.Apple Developer ↗[3]WAVE audio formatThe uncompressed PCM container.Library of Congress ↗

Frequently Asked Questions

Is converting M4A to WAV free?

Yes, M4A to WAV conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.

Are my files uploaded to a server?

No. The M4A to WAV converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. Check which processing mode is in use before you upload anything sensitive.

How long does M4A to WAV conversion take?

Most M4A to WAV conversions finish in under a minute. Larger files take proportionally longer, but everything happens locally so there is no sign-up wait.

Will the conversion reduce file quality?

That comes down to the formats at each end. A lossless conversion changes nothing you can measure. A lossy one shaves the file down and takes a small amount of quality with it.

Does this work on mobile devices?

Yes. The M4A to WAV converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.