SpeakwiseFree Audio Compressor: Make Audio Files Smaller
This free audio compressor makes a sound file smaller without you needing any software. Pick an audio file and choose how small you want it. The tool builds a smaller MP3 right in your browser, and nothing uploads while it works.
Free. No sign-up. Your file stays on your device while it converts.
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Have a WAV file to shrink first? Try WAV to MP3, or turn your audio into text with audio to text.
How to compress an audio file
1. Choose your audio file
Pick any audio file, or drop it into the box.
2. Pick how small
Choose Small, Balanced or High quality.
3. Download your smaller file
See the new size, then download your MP3.
Why compress an audio file
A smaller file is easier to email, message or upload. Gmail, for example, only allows attachments up to 25 MB.
This tool saves your audio as a smaller MP3, so a long voice note or meeting recording fits where it needs to.
Choosing how much to shrink it
Small gives you the smallest file. It is one channel, called mono, where both sides play the same sound, which is fine for voice. It suits voice notes, lectures and meetings.
Balanced is the usual choice. It is also mono, but it keeps speech clear while shrinking the file a lot. High quality keeps both channels, called stereo, and suits music.
The tool shows you the new size before you download it, so you always know what you are getting.
What this tool does not do
This is not studio-style leveling that evens out loud and quiet parts of a recording. It only makes the file smaller.
The sound keeps its original balance. If a part was quiet before, it stays quiet after compressing.
Good to know before you start
This tool handles one file at a time, up to 2 hours long. It accepts M4A, MP3, WAV, AAC, AIFF, FLAC and the sound inside MOV and MP4 videos.
It works in modern browsers on iPhone, iPad, Android phones, and Mac or Windows computers, including Chrome, Safari and Edge.
Who this is for
Anyone with a voice note or meeting recording that is too big to email, and anyone running low on phone storage. If you need a standard WAV file first, try WAV to MP3 or MP3 to WAV, then compress the result here.
Used by recruiters, executives, consultants, and more.
Frequently asked questions
Is this audio compressor free to use?
Yes. It is free, with no sign-up and no watermark on the file you download.
Does this even out loud and quiet parts of my recording?
No. This tool only makes the file smaller. It does not change how loud or quiet any part sounds.
Does my file get uploaded to compress it?
No. The whole process runs in your browser, on your device. Nothing uploads unless you choose to transcribe the file afterward.
What do Small, Balanced and High quality mean?
Small gives you the smallest file, good for voice notes and meetings. Balanced keeps speech clear while still shrinking a lot. High quality keeps both channels for music.
Will I see the new file size before I download it?
Yes. The tool shows the new size right away, so you can check it before you download anything.
What format do I get back?
Always MP3, no matter what format you started with.
What file types can I compress here?
M4A, MP3, WAV, AAC, AIFF, FLAC, the sound inside MOV and MP4 videos, and most other audio your browser can play.
How long can my file be?
Up to 2 hours. The tool checks the file first, so it never freezes partway through a long one.
Why would I need a smaller audio file?
Smaller files are easier to email. Gmail, for example, only allows attachments up to 25 MB.