Free audio converter and audio-size reduction tool

Audio File Prep: Convert or Reduce Audio Size for Transcription

Use Audio File Prep to make a separate downloadable MP3, M4A, WAV, WebM, or OGG copy, then choose whether it fits a separate transcription upload. It converts audio formats or reduces an audio file’s size; it does not transcribe, replace the source file, or guarantee that an output meets every transcription limit.

Prepare an audio copy · See Audio to Text limits

Quick answer

Choose one supported audio file up to 32 MB, then either create a smaller mono MP3 copy or choose an output format. Download the prepared file yourself and select it again in Audio to Text only if you are authorised and it meets that separate tool’s 16 MB, duration, and available-minute limits.

Convert or reduce an audio file in three steps

  1. Select an audio file: launch formats include MP3, M4A, WAV, WebM, OGG, AAC, FLAC, OPUS, and WMA, with a 32 MB limit for this preparation request.
  2. Choose the job: reduce size to a 64, 96, or 128 kbps mono MP3 copy, or convert to MP3, M4A, WAV, WebM, or OGG.
  3. Download and check: compare the returned size and choose the next workflow. If you need text from an authorised recording, upload the downloaded copy separately to Audio to Text.

When audio conversion or compression helps before transcription

Audio file too large for transcription

A high-bitrate recording can exceed a transcription uploader’s size limit even when it is not very long. Reducing the file creates a separate speech-friendly MP3 copy. Output size depends on the source, duration, and setting, so check it after download; no result is guaranteed to be 16 MB or smaller.

Audio format not accepted by the transcription tool

Audio to Text accepts MP3, M4A, WAV, WebM, and OGG. Use this tool to convert AAC, FLAC, OPUS, or WMA to one of those choices, then reselect the new file in the separate transcription tool.

Keep the original intact

Audio File Prep does not rename or replace the source on your device. It returns a generic prepared-audio download for you to store, review, or upload separately.

Fictional size-reduction example

Example only: imagine an authorised 25 MB WAV recording of a discussion. Select “Reduce file size” and the Balanced 96 kbps mono MP3 setting, then download the resulting MP3. Its actual size depends on the content and duration, so do not assume a particular percentage reduction. If it is 16 MB or smaller and within your applicable duration and minute allowance, you can choose it later in Audio to Text.

Processing, privacy, and permission boundary

Your source remains on your device while you choose settings. When you start preparation, the selected audio is processed for that request in a restricted temporary workspace. It is not saved to account history. Make sure you are authorised to process the recording and to use any downloaded copy; a conversion tool does not establish consent, course permission, research ethics approval, or confidentiality compliance.

Audio File Prep FAQs

Does Audio File Prep transcribe audio?

No. It prepares a downloadable audio copy. Use the separate Audio to Text workflow if you need editable text.

Does reducing audio guarantee a file under 16 MB?

No. The final size depends on the source audio, duration, and selected setting. Check the downloaded file before using it with a separate uploader.

What output formats work with Audio to Text?

Audio to Text accepts MP3, M4A, WAV, WebM, and OGG. Its other rules—including the 16 MB size limit, duration cap, available minutes, and authorisation requirement—still apply.

What happens to the file I select?

It is processed for the preparation request and is not saved to account history. Downloaded output is available to your browser for you to save.

Choose the appropriate next step

Transcribe an authorised compatible copy · Review Audio to Text limits and responsible-use guidance · Browse free study tools · Use PDF Summarizer for authorised text-based PDFs, not audio