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GEEDITORtools
AUM4A

AU to M4A Converter

File Converter

Your files. The format you need.

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Make your files fit.

Drop your files here, or choose them below.

Up to 50 files · 100 MB per file

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Conversion settings

Changing settings resets completed results so you can convert them with the new settings.

Converted on your device.
Formats & limitations

A damaged or protected file, an unsupported codec, a blocked engine download, or limited browser memory can prevent conversion. Try a smaller compatible sample first.

This converter processes file content in your browser. Some formats download extra engine code first; the converter does not upload the file content to that code provider.

This image route exports pixel data, not a repair of the original. Layers are flattened and animated or multipage files use one frame or page. Color depth, profiles and metadata may change; lost detail cannot be recovered by changing the extension. This route extracts the PDF text layer and creates a new text-based document. Scanned pages need a separate OCR tool. Original layout, images and reading order are not guaranteed to survive, and password-protected PDFs are not supported.

This document route rebuilds readable text in the new format. It does not preserve the original page layout, embedded pictures, tracked changes or rich styling. Compare the exported paragraphs with the source before editing or sharing. This route converts cell values rather than a complete workbook. Charts, macros and formatting are not retained. Formulas use cached results or inert text, and date serials may remain numbers. JSON input must be a table-like array of records or rows.

Up to 50 files · 100 MB · 500 MB. A damaged or protected file, an unsupported codec, a blocked engine download, or limited browser memory can prevent conversion. Try a smaller compatible sample first.

GEEDITOR / AU → M4A

About this conversion · AU → M4A

Use AU → M4A when your player or editing workflow needs M4A. The engine decodes and re-encodes supported tracks; this is not a lossless container rename.

The original file on your device is not overwritten. Keep it until you have opened and checked the downloaded result; a different extension does not restore information already missing from the source.

This route converts the first audio track. Metadata and extra tracks are not retained. Lossy re-encoding can change sound quality; saving a compressed recording to a lossless format cannot restore discarded sound information.

The current engine uses this output preset: M4A / AAC · 256 kb/s · 48,000 Hz · 2 ch · faststart. These values describe the output, not the source recording. The image-quality slider does not change this media preset.

The queue accepts up to 50 files and 500 MB of combined input. The per-file cap is the limit shown above, at most 100 MB. Individual engines can impose stricter limits; split large jobs before retrying.

How to convert

  1. Click “Choose files” or drop a genuine AU file into the tool. Start with one small sample; changing a filename extension does not change its actual format.
  2. After file checking, the initial output is M4A. You can change the output selector to another compatible format after adding a file. The guide below describes the default AU → M4A conversion, not every alternative.
  3. Image quality, image width, background, PDF page and icon controls do not configure this conversion. Use the engine's built-in settings; this interface does not offer extra controls for this route.
  4. Click “Convert files” once the file is ready. Keep the tab open while it runs. Some formats first download an additional engine; do not repeatedly restart the task while that engine loads.
  5. After completion, use the download link on the file's row. For several completed results, “Download all” packages them in a ZIP; it does not merge their contents. Save downloads before refreshing or closing the tab.
  6. Listen to the downloaded M4A at the beginning, middle and end. Compare duration, loudness and channel balance with the AU source, and test it in the actual destination player.

Frequently asked questions

Can I change the audio or video encoding preset here?

The current engine uses this output preset: M4A / AAC · 256 kb/s · 48,000 Hz · 2 ch · faststart. These values describe the output, not the source recording. The image-quality slider does not change this media preset. Image quality, image width, background, PDF page and icon controls do not configure this conversion. Use the engine's built-in settings; this interface does not offer extra controls for this route.

Why are audio, subtitles or extra tracks missing?

This route converts the first audio track. Metadata and extra tracks are not retained. Lossy re-encoding can change sound quality; saving a compressed recording to a lossless format cannot restore discarded sound information.

Why is the converted file larger?

Media size depends on duration and the output codec or preset, not the filename extension alone. This interface has no bitrate or trimming controls. For a smaller result, prepare a shorter source or choose another suitable output format.

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