Convert AAC to FLAC

AAC to FLAC converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

About formats

AAC

AAC (Advanced Audio Coding) is a lossy audio codec standardized by MPEG, designed as the successor to MP3. AAC delivers better sound quality than MP3 at the same bitrate and is the default audio codec for YouTube, iTunes, Apple Music, and most modern streaming services.

Developer
ISO/IEC (MPEG)
Initial release
1997
Compression
Lossy
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • Streaming music on modern platforms
  • YouTube and Apple Music audio
  • High-quality lossy audio at low bitrates
  • Mobile audio playback
  • Efficient video audio tracks

Pros

  • +Better quality than MP3 at the same bitrate
  • +Default codec for YouTube, iTunes, and Apple Music
  • +Efficient at low bitrates
  • +Wide hardware support

Cons

  • −Lossy compression discards data
  • −Not lossless like FLAC or ALAC
  • −No multi-track support in raw .aac
  • −Some encoder quality variation

FLAC

FLAC (Free Lossless Audio Codec) is an open-source lossless audio format that compresses audio without discarding any information, typically reducing file size by 50-60% compared to WAV while allowing perfect reconstruction of the original signal. FLAC is the preferred format for high-fidelity music archives and audiophile collections.

Developer
Xiph.Org Foundation
Initial release
2001
Compression
Lossless
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Pros

  • +Lossless compression with perfect reconstruction
  • +50-60% smaller than WAV
  • +Open-source and royalty-free
  • +Supports up to 24-bit depth and multi-track

Cons

  • −Larger than lossy formats like MP3
  • −Not ideal for streaming on limited bandwidth
  • −Less universal device support than MP3
  • −Some portable players lack FLAC support

How to convert AAC to FLAC

  1. 1

    Select AAC files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.

  2. 2

    Choose flac — or any other format you need as a result (more than 200 formats supported).

  3. 3

    Let the file convert, then download your flac file right away.

AAC vs FLAC

PropertyAACFLAC
CompressionLossyLossless
Color depthup to 24-bitup to 24-bit
Multi-trackNoYes
DRM supportNoNo
Open formatNoYes

When to use AAC vs FLAC

AAC

  • Streaming music on modern platforms
  • YouTube and Apple Music audio
  • High-quality lossy audio at low bitrates
  • Mobile audio playback
  • Efficient video audio tracks

FLAC

  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Use cases for AAC → FLAC

  • Streaming music on modern platforms
  • YouTube and Apple Music audio
  • High-quality lossy audio at low bitrates
  • Mobile audio playback
  • Efficient video audio tracks
  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Frequently Asked Questions

Is converting AAC to FLAC free?
Yes. This AAC → FLAC converter runs entirely in your browser and is completely free — no account, no credits, no watermark.
Which devices and platforms can I use to convert AAC to FLAC?
Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.
Are my AAC files uploaded to a server?
No. Files never leave your device. The entire AAC → FLAC conversion runs locally in your browser, so your data stays private.
Can I convert multiple AAC files at once?
Yes — batch conversion is supported. Add as many AAC files as you like and convert them to FLAC in one pass, then download the results together.
What is the maximum file size?
There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.
Will converting AAC to FLAC lose quality?
No. FLAC is a lossless format (or used in a lossless mode here), so the original data from your AAC file is preserved bit-for-bit in the converted result.
Does FLAC support transparency?
No — FLAC has no alpha channel. Transparent areas of your AAC file will be filled with a solid background colour in the converted file.
Will the converted FLAC file be larger than the AAC?
Usually yes — converting from a lossy format to a lossless one means the FLAC file preserves full detail and therefore grows compared to the AAC original. Expect a roughly 30–60% size increase for typical content.

Related Conversions

Specific converters

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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