Change an MP3 recording into an AIFF file when an audio project or recipient requests that format. This free MP3 to AIFF converter processes one uploaded file at a time, with no account or software installation required. The output is uncompressed 16-bit PCM in an .aiff file.
The conversion changes how the available audio is stored. It cannot recover information that MP3 compression removed or recreate the original recording master. Keep the MP3 source alongside the new copy, especially if it is the only original you have.
MP3 and AIFF are different ways to store audio
MP3 uses lossy compression. AIFF can store uncompressed PCM, the form discussed in the Library of Congress AIFF description. This page creates that PCM form with a fixed 16-bit sample depth.
| Property | MP3 input | This tool's AIFF output |
|---|---|---|
| Extension | .mp3 | .aiff |
| Audio encoding | MP3 | 16-bit PCM |
| Compression | Lossy | Uncompressed |
| Sample storage | Compressed audio frames | Big-endian PCM samples |
| Size factors | Duration and average bitrate | Duration, sample rate, channels, and sample depth |
| Purpose | Existing compressed recording | A copy for an AIFF-compatible destination |
AIFF and WAV can both contain PCM. Choosing AIFF instead of WAV does not automatically add detail or make the audio sound better. Use the format and properties required by the receiving project.
When an MP3 to AIFF conversion is useful
Supply audio to an AIFF-based project
An editor or collaborator may request AIFF assets for an existing project. Converting your available MP3 gives you a file in that format. Check the required sample rate, channels, and bit depth first; this page has fixed 16-bit output and does not let you adjust the output settings manually.
Prepare an uncompressed playback asset
A media application or playback workflow may expect an uncompressed AIFF asset. Make a representative conversion and import it into the actual destination before preparing more files. A successfully converted file still needs checking for playback, duration, and any project-specific requirements.
Keep a delivery copy separate from the source
Sometimes MP3 is the only available version of a spoken cue, recording, or music export. An AIFF copy can meet the format requirement; keep the MP3 original as well. When archiving the AIFF, note that it was converted from MP3. Such a copy is not an original lossless recording.
How to convert MP3 to AIFF online
- Upload one MP3. Choose or drag in a
.mp3file within 200MB and 30 minutes. Wait for the file checks and upload to complete. - Start the conversion. AIFF is already the output format. Start the task and wait while the service decodes the uploaded audio into 16-bit PCM.
- Download and check. When conversion finishes, download the
.aifffrom the completed file card and open it in your intended player or audio application.
The converter uses a file available on your device. Finish any cloud download first; a sharing link is not an upload. Renaming an MP3 with an AIFF extension does not decode the audio or create a valid AIFF container.
The AIFF output is fixed at 16-bit PCM
Check for PCM audio, 16-bit depth, and the .aiff extension in the saved result. The output is fixed at uncompressed 16-bit big-endian PCM in an AIFF file. There is no option for 24-bit output or another audio encoding.
There are no bitrate, sample-rate, channel, or bit-depth controls on this page. PCM does not use a lossy target-bitrate setting here; its data rate follows the sample rate, number of channels, and sample depth. Check those properties rather than expecting the MP3's bitrate to become an AIFF setting.
Review the start and end of the recording, total duration, and channel layout. Also check titles, artist names, artwork, and markers if they matter to your workflow. Complete metadata transfer is not guaranteed, and the tool does not create missing cue points or rebuild a media library entry.
Does converting MP3 to AIFF make it lossless?
The resulting AIFF stores uncompressed PCM, but its audio still comes from a lossy MP3. Decoding the MP3 produces PCM data, but it cannot recover information discarded by lossy compression. It does not automatically remove noise or repair distortion. A larger result is not an upgrade to the original recording's quality.
The 16-bit label describes the output samples. It does not prove that the original recording was captured at 16-bit, nor that any earlier high-resolution source has been recovered. A high-bitrate MP3 has still undergone lossy compression; its bitrate does not prove that all of the original information was preserved.
For later editing, use an original PCM or lossless recording if you already have one and the destination accepts it. If MP3 is your only source, keep it and judge the AIFF against the actual delivery need. Avoid repeatedly exporting between lossy formats when you can return to the best available original.
Why an AIFF file is usually larger
Uncompressed PCM size is approximately sample rate × channels × bytes per sample × seconds. A four-minute file at 44.1kHz, stereo, and 16-bit uses about 42.34MB of audio data. This is a decimal-megabyte estimate, rounded from 42.336MB and excluding headers.
For comparison, a hypothetical MP3 of the same length averaging 192kbps contains about 5.76MB of audio data, using MB ≈ average kbps × seconds ÷ 8000. That bitrate is an assumption for the source example, not a selectable AIFF output setting. These figures are calculations, not measured conversion results or a guaranteed size ratio.
Check the real download before sending it or planning storage. A 200MB upload allowance does not mean the resulting AIFF will stay under 200MB. The source must also meet the 30-minute limit, even if a low-bitrate recording fits easily within the size limit.
Input and output playback
The page normally checks the input MP3's duration in the browser before upload. If this step fails, check that the file is complete and plays in an MP3-compatible application, then try another browser. The service still validates the uploaded audio; a correct extension alone is not enough.
AIFF playback support varies between browsers and applications, so this page displays a file download card instead of an inline AIFF player. Download the completed result and check it in an AIFF-compatible player. This is separate from the earlier MP3 input-duration check.
Frequently Asked Questions
Is the MP3 to AIFF converter free?
Yes. No account or credits are required. Each task accepts one .mp3 file no larger than 200MB and no longer than 30 minutes.
What kind of AIFF file does this page create?
It creates an .aiff file containing uncompressed 16-bit big-endian PCM. There is no option for 24-bit output or another audio encoding.
Can MP3 to AIFF restore the original sound quality?
No. An MP3 has already undergone lossy compression. Converting it into PCM cannot recover the information that was discarded or recreate an original lossless master.
Can I choose 24-bit AIFF or a different sample rate?
No. The output is fixed at 16-bit PCM, with no bit-depth, sample-rate, channel, or target-size selector. Check the downloaded file against any specific requirements.
Is AIFF automatically better sounding than WAV?
No. Both containers can hold PCM audio; the stored samples and their properties determine the audio, not the extension alone. Choose the format accepted by your project.
Will conversion make my MP3 smaller?
Usually not. Uncompressed AIFF generally needs more space than MP3. Actual size depends on duration, sample rate, channels, and the 16-bit output depth, so check the saved file rather than assuming a fixed ratio.
What if the MP3 or AIFF preview does not play?
If the page reports that it cannot read the MP3's duration, check that the original file is complete and try another browser. The AIFF result is provided as a file download; an inline output player is not shown. Download it and listen in an AIFF-compatible application. Input checks and output playback are separate steps.