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AAC to AIFF Converter

Convert AAC to AIFF online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. 01

    Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. 02

    Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. 03

    Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

AAC to AIFF

Why convert AAC to AIFF?

AAC is a lossy format, while AIFF is an uncompressed format.

  • No further quality loss

    AIFF is lossless, so from here on the file keeps every detail - good for editing and archiving.

  • Where AIFF works best

    Studio-quality audio on Apple systems.

AAC vs AIFF: what's the difference?

PropertyAACAIFF
TypeAudioAudio
CompressionLossy (smaller files, some quality loss)Uncompressed (largest files)
Opens inApple devices, Android and most media playersMacs, iTunes and professional audio editors
Best forBetter quality than MP3 at the same file sizeStudio-quality audio on Apple systems

What is an AAC file?

Advanced Audio Coding

Developed By
Bell Labs, Fraunhofer IIS, Dolby, Sony, Nokia
Initial Release
1997
MIME Type
audio/aac

Advanced Audio Coding (AAC) is a lossy digital audio compression standard defined by ISO/IEC 13818-7 (MPEG-2) and ISO/IEC 14496-3 (MPEG-4). Developed by a consortium including Bell Labs, Fraunhofer IIS, and Dolby Laboratories as the successor to MP3, AAC utilizes the Modified Discrete Cosine Transform (MDCT) algorithm and perceptual noise shaping to discard imperceptible signal components. It supports up to 48 audio channels, arbitrary sample rates, and utilizes extensions such as Spectral Band Replication (SBR) to achieve higher fidelity at lower bitrates than predecessor formats.

How to open an AAC file

AAC serves as the default audio container for Apple's iTunes and iOS devices, ensuring native support within the macOS Core Audio framework and Apple Music. Windows 10 and 11 provide native decoding support via the Groove Music and Windows Media Player applications. For cross-platform playback or advanced stream analysis, users should utilize VLC Media Player or FFmpeg, which contain the necessary libavcodec libraries to decode AAC streams without external codec packs.

What is an AIFF file?

Audio Interchange File Format

Developed By
Apple Inc.
Initial Release
1988
MIME Type
audio/x-aiff

The AIFF (Audio Interchange File Format) is a lossless audio container format developed by Apple Inc., functioning as the standard uncompressed audio format for the Macintosh platform. Based on the EA IFF 85 standard, AIFF files store data in Pulse Code Modulation (PCM) format using big-endian byte ordering. It is functionally analogous to the WAV format used on Windows but differs in its header structure and byte sequence. AIFF is widely used in professional audio recording and editing due to its lack of compression artifacts and high-fidelity signal retention.

How to open an AIFF file

AIFF is the native uncompressed audio format for macOS, allowing files to be opened immediately in QuickTime, Apple Music, and Logic Pro. Windows users can open AIFF files using Windows Media Player, though some metadata may not render correctly. For professional manipulation or playback on Linux and Windows systems, VLC Media Player and Adobe Audition are the industry-standard recommendations, ensuring accurate interpretation of the big-endian PCM data streams.

More tools

More free audio tools

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • Convert AAC to AIFF in seconds

    Every AAC to AIFF conversion runs on our servers, so your device stays fast and the output quality stays intact.

  • Fast, cloud-powered

    No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

  • Secure & private

    Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

  • Free - no account needed

    Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert AAC to AIFF via API

Automate AAC to AIFF conversions in three steps: create a job, upload your file, then poll for the result.

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "aac-to-aiff",
    "tasks": {
      "upload-file": {
        "operation": "import/direct/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "input_format": "aac",
        "output_format": "aiff"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (upload_url of the upload-file task in the response)
curl -X PUT "$UPLOAD_URL&filename=input.aac" --upload-file input.aac

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

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