Compress audio and MP3 files

An MP3's size follows its bitrate. At 64 kbps, a minute is about 0.5 MB, against 1.4 MB at 192 kbps and about 10 MB for a CD-quality WAV, so an hour-long recording comes to about 29 MB.

For a voice, such as a lecture, a meeting, or a voice note, 64 kbps is clear, and 48 kbps in mono still is. For music, stay at 128 kbps or more, or it starts to sound thin and swirly.

For a single voice, yes. Under More options, Channels turns stereo into mono, and the bitrate then carries one channel instead of two, so a voice sounds clearer at the same size. Keep stereo for music.

It was already at or under the bitrate you picked. File info shows a file's bitrate, so check it and pick a lower one. To make a recording shorter instead, cut it or remove its long pauses.

Yes, and that saves the most: a WAV turned into a 128 kbps MP3 is about a tenth of the size. To keep every detail in a smaller file, pick FLAC instead, usually around half the WAV.

No. This makes the file smaller. A compressor in an editor evens out loud and quiet moments, which is another job: Balance audio evens out voices, and Boost volume sets the overall level.

Yes, for the first hour of each file, 10 times a day, with no sign-up. For longer files, see pricing.

They stay private. Files are deleted after 24 hours, and free results after 1 hour.