Convert your .aac files to .mp3 format online for free. No software to install. Fast, secure, and easy.
Pro account required for audio & video
Drag and drop your .aac file or click to browse.
Select MP3 as your output format.
Click Convert and download your .mp3 file.
Converting between AAC and MP3 changes the codec used for compression. MP3 offers the widest device compatibility of any audio format.
AAC (Advanced Audio Coding, introduced in 1997) uses Lossy (MDCT-based with TNS and PNS tools) compression. MP3 (MPEG Audio Layer III, introduced in 1993) uses Lossy (psychoacoustic model + MDCT) compression. AAC browser support: Universal. MP3 browser support: Universal.
Both AAC and MP3 use lossy compression. Converting between two lossy formats involves decoding the AAC file and re-encoding it as MP3, which introduces an additional generation of compression. To minimize quality loss, use the highest practical quality setting for the MP3 output.
Typical AAC file size: A 4-minute song at 256 kbps AAC-LC: ~7.3 MB. Typical MP3 file size: A 4-minute song at 192 kbps: ~5.5 MB; at 320 kbps: ~9.2 MB.
When converting between two lossy formats, use the highest practical bitrate for the output to minimize the quality impact of double compression. If possible, convert from the original lossless source instead of from a previously compressed file.
Convert AAC to MP3 with 3 free conversions per day. No hidden fees.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion.
Convert files from any device — desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .mp3 file maintains the best possible quality. No unnecessary compression or quality loss.
Audio conversion requires a Pro account. See pricing — starting at $4.99/month
You get 3 free conversions per day. Audio conversions require a Pro account.
Most files convert in under 10 seconds. Larger files may take a bit longer depending on size.
Yes. Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion. We never store your files.
Currently, SquishConvert converts one file at a time. Batch conversion is coming soon — stay tuned!
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.