Use this AAC to WAV converter when an editor requires WAV or a recipient needs an uncompressed PCM copy. Upload one .aac file and download the WAV once conversion finishes. No sign-in or software installation is required.
The output is 16-bit PCM WAV. Decoding AAC into PCM can make the recording usable in a workflow that requests WAV, but it cannot bring back sound information removed during earlier AAC compression. Keep the original and check that 16-bit output meets your requirements.
What changes between AAC and WAV?
AAC is an audio codec that uses lossy compression, as described in MDN's AAC guide. WAV is a container that can hold several kinds of audio. This tool specifically writes uncompressed, signed 16-bit little-endian PCM, rather than another compressed codec inside WAV.
| Property | AAC input | This tool's WAV output |
|---|---|---|
| Extension | .aac | .wav |
| Common file structure | ADTS carrying AAC audio | WAV carrying PCM audio |
| Compression | Lossy AAC | Uncompressed PCM |
| Precision | AAC bitrate does not reveal the original recording's PCM bit depth | Fixed 16-bit samples |
| Expected size | Depends on bitrate and duration | Depends on sample rate, channels, and duration |
| Main purpose here | Existing compressed recording | Copy for a PCM workflow |
This page accepts .aac files, including common ADTS files containing AAC-LC. It does not accept .m4a simply because that container may also contain AAC. Renaming an extension does not change the file structure or establish compatibility.
When an AAC to WAV conversion helps
Bring an exported AAC recording into an editor
An existing recording or export may be saved as AAC while a project requests PCM assets. A WAV copy can provide that input for cutting or arranging audio. Check the beginning, ending, and channel balance after import. If the editor already reads your AAC correctly, an intermediate conversion may be unnecessary.
Deliver a file to someone requesting PCM WAV
A recipient may ask for WAV as part of a delivery specification. Confirm that 16-bit PCM is acceptable before converting. The WAV extension alone is insufficient if the request also specifies 24-bit precision, a particular sample rate, or a different channel layout. Compare those requirements with the saved result.
Prepare a copy for listening and annotation
A PCM copy can suit a review or annotation application that works with WAV. Listen through important sections and confirm that the whole recording is present before beginning your work. The converter changes the audio format; it does not transcribe speech, remove noise, or correct recording problems.
How to convert an AAC file to WAV online
- Upload one AAC file. Select or drag in an
.aacfile up to 200MB and 30 minutes. The upload area shows file information; browser playback of this input is not required. - Start conversion. Wait for the upload to finish, then start the task. WAV is already selected. The service checks the audio and duration and creates the PCM output.
- Check and download. Preview the completed WAV if your browser supports it and save a local copy. Open that copy in its intended application before delivering it or deleting any working files.
The page accepts one file per task and has no batch-upload or URL-import option. Use a recording that has finished exporting or downloading. An accepted extension is only an initial check: damaged data or an unsupported AAC encoding can still prevent processing.
Does AAC to WAV improve audio quality?
No lost detail is restored. AAC has already removed some information through lossy encoding. A WAV copy stores the decoded sound as PCM, so a larger file or an “uncompressed” label does not turn it into the original recording before compression.
The output is uncompressed 16-bit PCM WAV. This page does not offer 24-bit or floating-point output, and conversion cannot restore audio detail discarded by lossy AAC compression.
For repeated editing, keep a suitable working copy and avoid unnecessary exports to lossy formats between stages. Listen at similar volume when comparing the AAC and WAV. Distortion, background noise, and clipped speech in the source are not repaired by a format change.
Why the WAV file can be much larger
PCM stores samples without AAC's compression. Its size is mainly determined by sample rate, channel count, sample precision, and length, rather than the compressed source file's size. Two AAC files with the same duration can differ in size and still produce similarly sized WAV copies when their PCM parameters match.
Estimate bytes ≈ sample rate × channels × bytes per sample × seconds. At 48kHz, two minutes of 16-bit PCM contains about 11.52MB for mono or 23.04MB for stereo. These use decimal MB, omit file headers, and are calculations rather than measured results from your upload. They are not selectable settings on this page.
There is no fixed AAC-to-WAV size ratio, and the .aac extension does not reveal the original bitrate. A larger WAV is not proof of better sound. Check the destination's file-size allowance before sending the output, especially for longer stereo recordings.
Check the output and the recording's full length
Check that the downloaded file reports PCM, 16-bit, with the expected duration, sample rate, and channels. The page has no bit-depth, sample-rate, channel, dither, or target-size selector. If your workflow requires specific settings, inspect the result rather than assuming that every WAV meets the same specification.
AAC input uses a file-information preview, so the absence of an input player does not stop a valid upload. The service must still read the audio and validate the 30-minute limit. A small AAC file may contain a long recording, and a file-information duration may be an estimate. Check the complete recording in its source application if its length is uncertain.
This tool does not shorten audio to fit. Prepare a suitable excerpt separately when the source exceeds either limit. If processing fails, confirm that the original is complete and readable, then check its actual format and duration. Treat tags or other non-audio information separately; successful audio conversion does not guarantee that every metadata field transfers.
Frequently Asked Questions
Is the AAC to WAV converter free?
Yes. No account or credits are required. Each task accepts one .aac file up to 200MB and 30 minutes. Batch uploads are not available on this page.
What kind of WAV will I get?
The .wav output contains uncompressed, signed 16-bit little-endian PCM audio. It is not 24-bit or floating-point WAV. Check that this precision meets your editing or delivery requirements.
Is converting AAC to WAV lossless?
No conversion can recover information already removed by lossy AAC compression. Writing 16-bit PCM avoids another lossy-codec encoding pass, but it does not recreate the original uncompressed recording or guarantee bit-perfect preservation of that source.
Which AAC files can I upload?
The page accepts .aac, including common ADTS AAC-LC files, provided the service can decode them. It does not promise every AAC profile or accept .m4a under this input rule; changing the extension is not conversion.
Can I choose 24-bit WAV or a different sample rate?
No. Output is fixed at 16-bit PCM WAV, and the page has no bit-depth, sample-rate, channel, or bitrate selector. Check the actual output against your requirements.
Can I convert without previewing the AAC in my browser?
Yes. AAC input shows file information and does not require browser decoding. The service must still decode the audio and validate its duration against the 30-minute limit.
Can a small AAC file exceed the duration limit?
Yes. A compressed AAC file can be below 200MB and still run longer than 30 minutes. Both limits apply, and a displayed duration may be an estimate. Check the whole recording; the tool does not trim it automatically.