Online MP3 converter: complete guide (WhatsApp to MP3, mix & compress)

Choose a tool for the task you need to complete. Conversion and editing operations run on the server; the calculator only estimates file size.

ConvertirAudioaMP3 is a web application for working with audio files saved on your device. Select a file, choose the available settings, run the operation and download the result. It does not import files from external URLs.

Convert to MP3

Create an MP3 copy of an audio file. Choose 64, 128 or 192 kbps.

Compress

Re-encode an MP3 at a lower bitrate. This adds loss and does not change volume.

Trim

Select a start and end time and export the segment.

Mix and join

Order clips, trim each track and use crossfade between them.

Transcribe

Get text from a short recording. Review the result for errors.

Extract audio from video

Upload a local video containing readable audio to create an MP3. URLs are not accepted.

Files and results

Keep a copy of the original. Files are stored temporarily for processing; cleanup depends on the operation, with no single retention period for all tools. Technical service data is logged. See the privacy policy.

Bitrate calculator

Estimate MP3 size from duration and bitrate without uploading a file.