Reduce an uncompressed recording by choosing a suitable compressed format. Review actual size and quality without a promised file-size target.
On-device audio processing
Convert your audio
Free to use · No sign-up
Loading the local audio converter. Choose a file, review its detected format and output settings, then convert and check the download.
Three simple steps
Keep your original
1
Choose your audio
Select a recording and check the detected codec, rate and channels.
2
Choose an output
Review the resolved quality settings and any required changes.
3
Check and download
Read the warnings, listen and test the saved file in its destination.
Choose the right kind of compression
A large WAV or AIFF can become a smaller delivery copy through MP3, AAC, Opus or Vorbis encoding. Those formats are lossy. A supported integer WAV can also become FLAC or ALAC without changing its sample values; the saving depends on the recording.
Choose the format your recipient accepts. The preview uses explicit qualified quality settings and shows the actual finished bytes. It does not promise an exact file-size target or silently cut material to reach one.
Use the original once
Start from your best original. Repeatedly converting a compressed file into another compressed file can add more loss. If the original MP3 already meets the recipient's requirements, making a different MP3 is not automatically an improvement or a reliable way to save space.
Estimate, then check
Constant-bitrate audio size is approximately duration x bitrate / 8, with additional headers and metadata. Variable bitrate and lossless files need an actual encode to know their size. A ten-minute 160 kbps payload is about 12 MB before overhead; that is an estimate, not a delivery guarantee.
Listen to the downloaded copy and check it in the destination app. See measured size examples and CBR versus VBR for a more informed comparison.
Testable preview. Keep your originals and check downloaded results. Send useful feedback without attaching private recordings.
Your audio files are processed on your device. The browser downloads the site and engine from the host. See privacy information for temporary storage and optional services.
Can WAV restore quality lost in an MP3?
No. WAV can preserve the decoded signal without a new lossy encoding, but cannot recreate information already discarded.
Why was my file or output refused?
The actual codec, precision, layout or timing may fall outside the qualified subset. The app explains the restriction rather than silently reducing quality. See supported formats.
Does the maximum file size work on every device?
No. Limits are refusal ceilings. Browser quota and available memory may require smaller files. Physical mobile testing has not been performed for this preview.