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KioTools
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Related Tools

Audio De-Echo

Reduce echo and background noise from a recording.

Audio Format Converter

Convert audio to MP3, WAV, OGG, M4A or FLAC.

Audio Joiner & Merger

Combine multiple audio files with crossfade.

Compress Audio for Email

About this option

Email services usually limit attachments to 20–25 MB, and a long recording can easily exceed that. This page opens the compressor on 96 kbps mono, which halves the size again compared with stereo while keeping speech and most music clear.

When to use it

  • Sending a recording as an attachment
  • Sharing a long interview or lecture
  • Uploading to a site with a small file-size limit

How to use it

  1. 1Drop your audio file — 96 kbps mono is already selected
  2. 2Click Compress
  3. 3Check the size and download the MP3

Frequently asked questions

What does mono do?

It merges left and right into one channel, reducing the file size by about half. It suits speech; for music in stereo, switch it off.

How long a recording fits in 20 MB?

At 96 kbps, about 27 minutes per 20 MB. Lower the bitrate for longer recordings.

Can I compress several files?

Yes, add up to ten files and compress them in one go.

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