{"id":1174,"date":"2026-08-17T15:13:00","date_gmt":"2026-08-17T19:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=1174"},"modified":"2026-06-27T01:52:45","modified_gmt":"2026-06-27T05:52:45","slug":"convert-m4a-to-wav","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/convert-m4a-to-wav","title":{"rendered":"How to Convert M4A to WAV (Lossless from Apple Audio)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Your DAW won\u2019t import the voice memo. The sampler only accepts WAV. So you need to turn an <code>.m4a<\/code> into a <code>.wav<\/code> \u2014 and the result will be <strong>roughly ten times larger<\/strong> with, in most cases, no improvement in sound. That\u2019s not a bug; it\u2019s exactly what the format swap does. M4A almost always holds <strong>AAC<\/strong>, a lossy codec; WAV holds <strong>uncompressed PCM<\/strong>. Decoding one into the other gives you a bulky, edit-friendly, perfectly-compatible file at the <em>same fidelity the AAC already had<\/em> \u2014 useful for editing, useless as a \u201cquality fix.\u201d We verified the codec facts against the MPEG\/ISO standards, Apple\u2019s ALAC documentation, and the RIFF\/WAV spec, and we\u2019re honest below about the one case where the conversion really is lossless.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quick answer:<\/strong> Convert M4A to WAV when a tool <em>requires<\/em> uncompressed PCM input \u2014 a DAW, sampler, CD-authoring app, or any editor that won\u2019t accept AAC. The WAV will be <strong>much bigger<\/strong> (WAV is uncompressed; a 4 MB M4A can become ~40 MB) and it does <strong>not<\/strong> restore quality that lossy AAC already discarded \u2014 it just decodes the existing audio into an uncompressed container at the same fidelity. The one exception: if your M4A holds <strong>ALAC<\/strong> (Apple Lossless), M4A\u2192WAV is fully lossless in both directions. To convert, use a server-side tool like <a href=\"https:\/\/www.xconvert.com\/convert-m4a-to-wav\">xconvert\u2019s M4A to WAV converter<\/a> \u2014 upload, keep sample rate at Original, and click Convert.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jump to a section<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#inside\">What\u2019s actually inside an M4A<\/a><\/li><li><a href=\"#bigger\">Why WAV is bigger \u2014 and why that\u2019s the point<\/a><\/li><li><a href=\"#honesty\">The honest truth: WAV won\u2019t un-lose lossy quality<\/a><\/li><li><a href=\"#when\">When you genuinely should convert M4A to WAV<\/a><\/li><li><a href=\"#tool\">Convert M4A to WAV on xconvert<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"inside\">What\u2019s actually inside an M4A<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>.m4a<\/code> is a <strong>container<\/strong>, not a codec \u2014 it\u2019s the MPEG-4 Part 14 (MP4) file structure with an audio-only extension Apple introduced so players could tell at a glance that a file holds sound, not video. The container is just the box. What matters is the <strong>codec<\/strong> inside it, and there are two common possibilities:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>AAC (Advanced Audio Coding)<\/strong> \u2014 the usual occupant. AAC is a <strong>lossy<\/strong> codec standardized by MPEG\/ISO (MPEG-2 Part 7, ISO\/IEC 13818-7, and the enhanced MPEG-4 Part 3, ISO\/IEC 14496-3) and declared an international standard in April 1997 as MP3\u2019s successor. \u201cLossy\u201d means the encoder permanently discards audio data that psychoacoustic modeling predicts you won\u2019t hear, in exchange for a much smaller file. This is what you get from the iTunes Store, Apple Music downloads, and most voice-memo and podcast exports.<\/li><li><strong>ALAC (Apple Lossless Audio Codec)<\/strong> \u2014 the less common occupant, also stored in a <code>.m4a<\/code>. ALAC is <strong>lossless<\/strong>: it compresses without discarding anything, typically to about 40\u201360% of the original size, and decodes back bit-for-bit. Apple open-sourced it on October 27, 2011.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The catch: <strong>both use the same <code>.m4a<\/code> extension<\/strong>, so you can\u2019t tell lossy AAC from lossless ALAC by the filename alone. This single fact decides whether your conversion preserves everything or merely repackages already-lossy audio (more on that <a href=\"#honesty\">below<\/a>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>WAV<\/strong>, by contrast, is a <strong>container that holds uncompressed audio<\/strong> \u2014 almost always linear PCM (pulse-code modulation), the raw digital samples with no compression at all. It\u2019s a RIFF-based format developed by Microsoft and IBM in 1991, supporting bit depths of 8, 16, 24, and 32 bits and sample rates up into the hundreds of kHz. Because nothing is compressed, every sample is preserved exactly \u2014 which is precisely why audio software treats WAV as the safe, neutral working format.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"bigger\">Why WAV is bigger \u2014 and why that\u2019s the point<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AAC\u2019s whole job is to be small; WAV\u2019s whole job is to be exact. So when you convert, the file balloons. A 4 MB M4A song can land around <strong>40 MB<\/strong> as a WAV \u2014 roughly a <strong>10\u00d7 increase<\/strong> is normal, and the exact ratio depends on the M4A\u2019s original bitrate, the WAV\u2019s bit depth, the sample rate, and the channel count.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can estimate an uncompressed WAV\u2019s size directly, because PCM is just raw samples:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>bytes per second = sample rate \u00d7 (bit depth \u00f7 8) \u00d7 channels<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At CD quality \u2014 44,100 Hz, 16-bit, stereo \u2014 that\u2019s 44,100 \u00d7 2 \u00d7 2 \u2248 <strong>176 KB\/s<\/strong>, or about <strong>10 MB per minute<\/strong>, regardless of how the source was compressed. A 128 kbps AAC of that same minute is only ~1 MB. The WAV isn\u2019t \u201cbetter\u201d; it\u2019s just stored without compression, and uncompressed always costs more bytes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That size is a feature, not a flaw, for the workflows WAV is made for. Uncompressed PCM has no codec to decode, so editors load it instantly and <strong>re-saving a WAV never degrades it<\/strong> \u2014 unlike re-exporting AAC, where each save runs the lossy encoder again and compounds the loss. If your goal is the opposite (a smaller file to store or share), converting to WAV is the wrong direction; see <a href=\"https:\/\/www.xconvert.com\/blog\/compress-a-wav-file\/\">how to compress a WAV file<\/a> or just keep the M4A.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"honesty\">The honest truth: WAV won\u2019t un-lose lossy quality<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the part most \u201cconvert M4A to WAV\u201d pages skip, so read it carefully.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your M4A is <strong>AAC<\/strong> (the common case), the encoder already threw away data when the file was created. Converting to WAV <strong>decodes<\/strong> that lossy audio into an uncompressed container \u2014 it does <strong>not<\/strong> reconstruct the discarded frequencies. The WAV is lossless <em>relative to the AAC it came from<\/em>, but the AAC\u2019s quality ceiling is baked in. You get a bigger file at the <strong>same fidelity<\/strong>, not a better one. There is no tool, on xconvert or anywhere else, that can restore detail a lossy encoder permanently removed. Anyone promising \u201clossless upscaling\u201d or \u201crestore original CD quality\u201d from a lossy source is selling a myth.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your M4A is <strong>ALAC<\/strong> (Apple Lossless), the story flips: ALAC kept every bit, so <strong>M4A\u2192WAV is fully lossless in both directions<\/strong> \u2014 the WAV is a perfect decode of the original samples, and you could go back to ALAC later with no loss. This is the genuinely lossless scenario the title promises.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How to tell which you have? Check the file in a player that reports the codec (VLC\u2019s <em>Tools \u2192 Codec Information<\/em>, or Finder\u2019s <em>Get Info<\/em> on a Mac). If it says AAC, you\u2019re decoding lossy audio; if it says Apple Lossless \/ ALAC, you\u2019re working with a true lossless source. Either way the conversion is worth doing <strong>for compatibility and editing<\/strong> \u2014 just don\u2019t expect it to <em>add<\/em> quality.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"when\">When you genuinely should convert M4A to WAV<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">WAV is bigger and (for AAC sources) no higher-fidelity, so convert only when a real workflow needs uncompressed PCM:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>A DAW or audio editor requires it.<\/strong> Audacity, Pro Tools, Logic Pro, Adobe Audition, FL Studio and most editors handle WAV natively with zero decoding overhead. Some pipelines or plugins won\u2019t accept AAC\/M4A at all.<\/li><li><strong>A sampler or hardware instrument only reads WAV.<\/strong> Many samplers, drum machines, and embedded devices accept PCM WAV exclusively.<\/li><li><strong>CD authoring.<\/strong> Burning a standard Red Book audio CD needs uncompressed 16-bit \/ 44.1 kHz PCM, which is exactly what a CD-spec WAV provides.<\/li><li><strong>You\u2019re about to edit and re-export repeatedly.<\/strong> Working in WAV avoids <strong>generation loss<\/strong> \u2014 each AAC re-encode compounds the damage, whereas re-saving WAV doesn\u2019t. MDN\u2019s codec guidance is explicit: if audio \u201cwill be getting remixed or recompressed\u2026 avoid lossy compression, which would be compounded by recompressing.\u201d Decode to WAV once, edit, then export to your delivery format at the end.<\/li><li><strong>Maximum compatibility.<\/strong> WAV opens virtually everywhere \u2014 every OS, every editor, most embedded players \u2014 which isn\u2019t always true of M4A.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your real goal is a <em>small, shareable<\/em> file rather than an editable one, WAV is the wrong target \u2014 converting to MP3 keeps it compact and universally playable; see <a href=\"https:\/\/www.xconvert.com\/blog\/convert-m4a-to-mp3\/\">how to convert M4A to MP3<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">Convert M4A to WAV on xconvert<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.xconvert.com\/convert-m4a-to-wav\">xconvert M4A to WAV converter<\/a> decodes your file to uncompressed PCM WAV on our servers \u2014 no app to install. WAV has no codec or bitrate to choose (it\u2019s uncompressed by definition), so the controls are deliberately minimal:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1250\" src=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55.png\" alt=\"Leave Audio Sample Rate on Original to preserve the source rate exactly\" class=\"wp-image-1311\" srcset=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55.png 1600w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55-300x234.png 300w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55-1024x800.png 1024w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55-768x600.png 768w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-55-1536x1200.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\"><li>Open <a href=\"https:\/\/www.xconvert.com\/convert-m4a-to-wav\">xconvert.com\/convert-m4a-to-wav<\/a> and click <strong>Upload<\/strong> to add your file (<strong>From my Computer<\/strong>, <strong>Google Drive<\/strong>, or <strong>Dropbox<\/strong>).<\/li><li>Leave <strong>Audio Sample Rate<\/strong> on <strong>Original<\/strong> to preserve the source rate exactly. Only change it if a target tool demands a specific rate \u2014 e.g. set <strong>44100 Hz<\/strong> for standard CD authoring.<\/li><li>Leave <strong>Audio Channel<\/strong> on <strong>Original<\/strong> unless you specifically need to force mono or stereo.<\/li><li>(Optional) Use <strong>Trim<\/strong> if you only need part of the audio; otherwise leave it <strong>Unchanged<\/strong>.<\/li><li>Click <strong>Convert<\/strong>, then <strong>download<\/strong> the WAV individually \u2014 or grab several <strong>as a ZIP<\/strong> if you converted a batch.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Expect a noticeably larger file: WAV is uncompressed, so it\u2019ll dwarf the M4A. Your file uploads over an encrypted connection, is processed on our servers, and is <strong>deleted automatically a few hours later<\/strong> \u2014 nothing lingers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Does converting M4A to WAV improve audio quality?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>No \u2014 not if the M4A is AAC (the usual case).<\/strong> Lossy AAC permanently discarded data when the file was made, and converting to WAV only <strong>decodes<\/strong> that audio into an uncompressed container; it can\u2019t rebuild what was removed. You get a much larger file at the <strong>same fidelity<\/strong>, which is useful for editing and compatibility but not a quality upgrade. The exception is an ALAC (Apple Lossless) M4A, where the conversion is genuinely lossless.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Why is my WAV file so much bigger than the M4A?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Because WAV stores uncompressed PCM and M4A stores compressed AAC.<\/strong> AAC squeezes the audio; WAV keeps every raw sample. CD-quality stereo WAV runs about <strong>10 MB per minute<\/strong> no matter the source bitrate, so a 4 MB M4A commonly becomes ~40 MB \u2014 roughly a 10\u00d7 jump. That size is the price of an editable, never-degrading working file.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is M4A or WAV better quality?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>At equal source material, a WAV can be at most as good as the M4A it was decoded from \u2014 never better.<\/strong> WAV is the lossless\/uncompressed format, but if it was made from lossy AAC it merely inherits that AAC\u2019s quality. WAV \u201cwins\u201d only when its source was lossless (ALAC, or a direct recording). For storage and sharing, M4A\u2019s far smaller size is the practical advantage.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">How can I tell if my M4A is AAC or ALAC?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Open it in VLC and check Tools \u2192 Codec Information, or use Get Info on a Mac.<\/strong> It will report either <em>MPEG AAC<\/em> (lossy) or <em>Apple Lossless \/ ALAC<\/em> (lossless). This matters because ALAC \u2192 WAV is fully lossless, while AAC \u2192 WAV only repackages already-lossy audio at the same fidelity.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">What sample rate and bit depth should I use for the WAV?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Keep the sample rate at the source\u2019s original<\/strong> unless a target tool requires otherwise \u2014 resampling can\u2019t add detail and risks subtle artifacts. For <strong>CD authoring<\/strong>, use <strong>16-bit \/ 44.1 kHz<\/strong>. For <strong>DAW editing<\/strong>, 24-bit gives extra headroom against clipping during processing, though it makes the file larger still. On xconvert, leaving <strong>Audio Sample Rate<\/strong> on <strong>Original<\/strong> preserves the source rate.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Can I convert WAV back to M4A or MP3 afterward?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Yes \u2014 and that\u2019s the normal workflow:<\/strong> decode to WAV, edit, then export to a compressed format for delivery. Going back to a lossy codec re-introduces lossy compression, so do it <strong>once, at the end<\/strong>. To go the other direction efficiently, see <a href=\"https:\/\/www.xconvert.com\/blog\/convert-m4a-to-mp3\/\">convert M4A to MP3<\/a> or, to shrink an existing WAV, <a href=\"https:\/\/www.xconvert.com\/blog\/compress-a-wav-file\/\">compress a WAV file<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-06-25.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Formats\/Audio_codecs\">MDN \u2014 Web audio codec guide<\/a> \u2014 lists AAC compression as <strong>Lossy<\/strong>; warns that audio that \u201cwill be getting remixed or recompressed\u201d should avoid lossy compression \u201cwhich would be compounded by recompressing.\u201d<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Advanced_Audio_Coding\">Wikipedia \u2014 Advanced Audio Coding<\/a> \u2014 AAC is lossy; standardized in MPEG-2 Part 7 (ISO\/IEC 13818-7) and MPEG-4 Part 3 (ISO\/IEC 14496-3); declared an international standard April 1997, citing the MPEG\/ISO documents.<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Apple_Lossless_Audio_Codec\">Wikipedia \u2014 Apple Lossless Audio Codec (ALAC)<\/a> \u2014 ALAC is lossless, stored in the MP4\/<code>.m4a<\/code> container, compresses to ~40\u201360% of original size, open-sourced October 27, 2011.<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/WAV\">Wikipedia \u2014 WAV<\/a> \u2014 WAV is a RIFF-based, typically uncompressed LPCM format developed by Microsoft and IBM in 1991; supports 8\/16\/24\/32-bit depths and high sample rates.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Convert M4A to WAV the honest way: when uncompressed PCM is required, why the file gets ~10x bigger, and when M4A to WAV is truly lossless.<\/p>\n","protected":false},"author":4,"featured_media":1313,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-1174","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides","category-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Convert M4A to WAV (Lossless from Apple Audio)<\/title>\n<meta name=\"description\" content=\"Convert M4A to WAV the honest way: when uncompressed PCM is required, why the file gets ~10x bigger, and when M4A to WAV is truly lossless.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xconvert.com\/blog\/convert-m4a-to-wav\" \/>\n<meta property=\"og:locale\" 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