Free online tool
Convert AAC to FLAC
Free online AAC to FLAC converter - runs entirely in your browser. No upload, no account, no file size limit.
Drop AAC files here
AAC · and other formats (MP3, WAV, FLAC, AAC, OGG, M4A, OPUS, WMA, AIFF)
Audio sounds damaged or noisy?
Professional restoration by real engineers - noise removal, voice clarity, echo reduction.
Why convert AAC to FLAC?
- →FLAC is losslessly compressed audio, making it ideal for music archives, audiophile listening, and long-term storage.
- →Your AAC files are processed entirely in your browser - nothing is uploaded to any server.
- →Batch-convert as many files as you need in one click, then download them individually or all at once.
- →Note: converting from a lossy format (AAC) to a lossless one (FLAC) will not recover lost data, but it avoids further compression artifacts.
- →FLAC files are typically 40-60% smaller than WAV while preserving the same audio data.
How to convert AAC to FLAC online
- 1
Upload your AAC files
Drag and drop or click to select files. You can add multiple AAC files at once.
- 2
FLAC is pre-selected
The output format is already set to FLAC. Optionally adjust quality settings before converting.
- 3
Click Convert
Hit Convert while the audio engine loads in the background. No server involved.
- 4
Download your FLAC files
Download files one by one or all at once. No registration, no email, no waiting.
Source format
AAC
efficient streaming codec.
Best for: YouTube, Apple Music, and mobile streaming.
LossyOutput format
FLAC
losslessly compressed audio.
Best for: music archives, audiophile listening, and long-term storage.
LosslessProfessional audio restoration
Audio sounds noisy or unclear?
Converting format does not fix audio quality issues. If your AAC has noise, hiss, hum, or muffled speech, WefixSound engineers can professionally restore it. Free sample before you pay.
Frequently asked questions
Will I lose quality converting AAC to FLAC?
FLAC is lossless, so no further quality is lost in the conversion. If your source AAC is already lossy, converting to FLAC preserves it without additional compression artifacts.
Is the AAC to FLAC converter free?
Yes - completely free. No account, no registration, no email required. The tool runs in your browser and processes files locally.
Is my file uploaded to a server?
No. The converter runs entirely inside your browser tab. Your AAC files never leave your device.
Is there a file size limit?
There is no server-side limit. Practical limits depend on your device memory.
Can I convert multiple AAC files to FLAC at once?
Yes. Drop as many files as you need into the tool and click Convert.