WAV vs AIFF: Sound Quality, Metadata and Choosing a Working Master

The short answer: For ordinary uncompressed PCM audio, WAV and AIFF can preserve exactly the same samples. Neither format inherently sounds better. Choose WAV as a practical default when exchanging files across editors, operating systems or game-audio pipelines; choose AIFF when your receiving application or collaborator specifically prefers it. For either, matching the sample rate, bit depth, channel arrangement and actual encoding matters more than the extension.

Both are containers that organize samples and file information, and either can serve as a working master. See the Library of Congress records for WAVE and AIFF.

WAV vs AIFF at a glance

The table describes conventional PCM files, not every possible encoding. See Apple's Core Audio format table and Microsoft's RIFF documentation.

If the samples match, does WAV sound different from AIFF?

No. Export the same mix as 24-bit, 48 kHz stereo PCM WAV and AIFF without changing the samples, and a correct decoder returns the same ordered sample values. Neither container adds or removes audio detail.

Their file bytes still differ. WAV uses RIFF/WAVE with fmt and data chunks; AIFF uses FORM/AIFF with COMM and SSND chunks. Conventional PCM WAV is little-endian; AIFF is big-endian. File hashes therefore cannot establish decoded-sample equality. See Microsoft's WAVE structure and Apple's format table.

Conversion settings can change sound: 24-to-16-bit output reduces precision, resampling changes the sample grid, and normalization or downmixing changes sample values. These are export decisions, not inherent WAV-versus-AIFF differences.

Also check the actual codec: WAV can wrap audio other than linear PCM, and AIFF-C is a related format designed to handle additional encodings. An extension by itself is not proof of uncompressed PCM. The Library of Congress WAVE and AIFF format records describe these distinctions.

A matched-settings test: actual sizes and identical PCM

In a controlled test, we generated an original six-second stereo signal with two tones per channel and short fades—no commercial audio. FFmpeg 7.1.5 produced matching 48 kHz, stereo, signed 24-bit PCM outputs.

Here is the storage calculation, independent of the container: 6 seconds × 48,000 frames/second × 2 channels × 3 bytes/sample = 1,728,000 bytes. The WAV in this test was 48 bytes larger, owing to the particular chunks written by this encoder. That does not mean WAV is always larger. Different programs can write different headers and metadata.

We decoded each result to the same signed, interleaved 24-bit little-endian raw PCM representation, then computed SHA-256. Both produced:

52567a95e2ab2bcf507dc2d30e4fc9545829bb1ae805d1bbb09833c9737a5e8f

To compare your own matched files using FFmpeg, normalize the output before hashing:

ffmpeg -v error -i matched.wav  -map 0:a:0 -f s24le -c:a pcm_s24le -ar 48000 -ac 2 - | sha256sum
ffmpeg -v error -i matched.aiff -map 0:a:0 -f s24le -c:a pcm_s24le -ar 48000 -ac 2 - | sha256sum

Use this check only for files intended to share those settings. It establishes decoded-sample equality in this pipeline, not device compatibility or subjective listening results. See the FFmpeg and ffprobe manuals.

Metadata and album artwork: capability is not preservation

Files may carry titles, authors, comments and production information. But format support for a field does not guarantee that applications preserve or display it.

WAV has RIFF LIST/INFO fields for descriptive information. Broadcast WAVE (BWF) adds structures such as bext, useful when provenance or broadcast workflow fields matter. These are legitimate metadata mechanisms, not a promise that a music player will display every field. See Microsoft's RIFF services description and the Library of Congress WAVE record.

AIFF has native text and comment chunks for information such as name, author and annotation. Some workflows also use extensions such as embedded ID3 tags. The Library of Congress AIFF record documents the native metadata; FFmpeg's AIFF muxer documentation notes that writing ID3v2 tags is optional and disabled by default in that muxer.

Artwork is especially easy to lose. A player showing an album cover does not establish that the picture is inside the audio file; it may come from the application's library database or an external image. Even where embedded artwork can be stored using an extension, the exporting and importing applications must agree on that method.

As a small software-specific check, we added a title and artist to separate FFmpeg exports. ffprobe found both fields in our WAV but only the title in the AIFF. That is a result of this FFmpeg workflow, not evidence that AIFF cannot store author information. Audacity similarly warns that WAV-tag visibility varies by player, including cases where Apple Music/iTunes does not show certain WAV tags: Audacity Metadata Editor.

For an important master, keep a simple accompanying record of title, creator, source, sample settings, export software and rights details. If artwork or embedded tags matter, reopen the finished file in the actual receiving application and check them there.

Which should you choose for your workflow?

Editing and exchanging sessions

Default to PCM WAV unless a collaborator specifies otherwise. It is a predictable handoff format for stems, voice recordings, effects and mixes. Specify something concrete such as “stereo, 48 kHz, 24-bit PCM WAV,” rather than merely “high-quality WAV.” AIFF is equally valid if the destination editor or session expects it. Apple's own audio file services support parsing both; Audacity documents import/export support for both PCM formats in its file-format guidance.

Also preserve the editable project: a bounced audio file cannot reconstruct its tracks, plug-ins or automation.

Archiving the master

Preserve the highest genuinely useful resolution of the source, not an upsampled or artificially expanded copy. For long-term institutional or broadcast-style workflows, PCM Broadcast WAVE can be preferable when its metadata conventions match the archive's policy. The Library of Congress documents its use of BWF for audio preservation in its WAVE LPCM record. AIFF is still a defensible master when required by the collection or project.

Maintain backups, checksums and separate metadata. Standard RIFF WAV and AIFF have size limits; RF64 can extend WAV size, but the recipient must support it. See FFmpeg's RF64 compatibility notes.

Sharing with another person

Follow the recipient's requested container and PCM settings. Listening-only copies need not be huge; editing copies can stay uncompressed. Test the destination app for playback and tags.

Games, websites and smaller delivery copies

Keep WAV or AIFF as a source asset if that is what your game engine, audio middleware or production team imports; let the delivery pipeline use the format required by the target platform. A WAV file is not automatically the best size for a shipped game or web page.

When small transfers or supported web/game playback matter, Ogg Vorbis can be an appropriate lossy delivery copy. Preserve the PCM master and encode the smaller file from it; lossy conversion removes information and does not replace the master. Xiph.org explains the difference in its Vorbis FAQ. For a WAV source, see ConvertOGG's WAV to OGG page and the What Is OGG? guide. Check playback support in your destination environment.

If you receive Ogg audio that needs to enter a PCM editing workflow, OGG to WAV is the relevant conversion route. This can produce an editable working copy, but cannot recover audio discarded by an earlier lossy encode.

Mistakes worth avoiding

• Comparing WAV and AIFF file hashes. Their container headers and stored PCM byte order differ. Compare decoded samples in a common representation instead.
• Assuming “.wav” always means uncompressed PCM. Inspect the codec and bit depth, particularly when ingesting files from unfamiliar applications.
• Changing sample rate or bit depth for no reason. Keep the required master specification; use intentional conversion settings and suitable dither if reducing integer bit depth.
• Trusting artwork or tags to survive export. Test in the destination application and retain essential metadata separately.
• Converting a lossy delivery file back to WAV and calling it a lossless original. A PCM wrapper cannot restore data already removed by lossy encoding.

FAQ

Is AIFF better quality than WAV? Not when both hold the same decoded PCM samples. Differences arise from processing, encoding settings or playback behavior, not a fidelity advantage inherent in either container.

Can I convert WAV to AIFF without losing quality? Yes, if you preserve the PCM samples and settings. Use an uncompressed PCM output, verify the result, and treat metadata separately.

Are AIFF files always bigger than WAV files? No. At the same sample rate, bit depth, channel count and duration, PCM payload sizes are identical; container overhead depends on the program and optional chunks.

Will album art transfer between WAV and AIFF? Don't assume it. Embedded-art methods and player support differ, so verify with the actual application receiving the file.

Bottom line: Choose your working master by its PCM specification, metadata requirements and receiving software. Between matched PCM WAV and AIFF, sound quality is not the deciding factor. Keep the master untouched; make smaller, appropriately encoded copies for delivery.