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Convert OPUS to CAF

Convert OPUS audio to CAF online – full quality by default, with bitrate, channels and cutting options.

or drag them here, or paste with Ctrl+V / ⌘V

Audio and video files · up to 10 files at once

Conversion options

PDF pages

Leave empty for all, or type e.g. 1-3, 5, 8-

Resolution
PDF document
Page size
Images per page
Image resolution in the PDF
Image
Icon sizes (px)
Video

Lower resolutions reduce file size. The video will not be enlarged.

Audio
Bitrate

Higher means better sound and a larger file. “Auto” keeps the bitrate of the original (at least 128 kbit/s); from lossless files it uses the format’s high-quality setting.

Sample rate
Channels
Cut (optional)

Times such as 1:30 or 0:45.5. Leave empty to keep the whole recording.

Picture

The video shows this picture for the whole length of the sound – for example to upload music or a podcast to YouTube.

Video size
Document
Resolution
Pages to convert

Several pages arrive as a ZIP with one image per page.

Shown by e-readers in the library; leave empty to keep what the document says.

PDF/A-2b embeds all fonts so the file looks the same in many years; required by many courts and public offices.

Scales every sheet so it fits on a single page instead of being split across several.

Sheets

CSV and TSV hold one table: with “Every sheet” each sheet becomes its own file, together in a ZIP.

Separator

Excel in many European languages expects a semicolon; most other programs a comma.

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 7 days so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Audio and video files are uploaded only after you accept and are converted on our server. The input is deleted after processing; results are kept for 7 days. Privacy details

How to use: OPUS to CAF

  1. 1 Click “Choose files” or drop your OPUS files onto the page (up to 10 at once).
  2. 2 CAF is already selected as the output; open “Options” to set bitrate, sample rate, channels or a start and end time.
  3. 3 Click “Convert” and confirm the upload: audio conversion runs on our server.
  4. 4 Follow the upload and the conversion progress – you can keep browsing meanwhile.
  5. 5 Download the CAF files when they are ready; they stay available for 7 days unless you delete them.

About this tool

Opus is the modern open audio codec of WhatsApp, Telegram, Discord and WebRTC: excellent sound at very small sizes. CAF (Core Audio Format) is Apple’s modern container for audio of any length, used by macOS, iOS and Xcode; here with lossless Apple sound (ALAC).

This converter turns your OPUS files into CAF, the right choice for Apple apps, Xcode projects and macOS audio tools. By default the sound keeps its full quality and its title, artist, album and cover art; open “Options” to choose a bitrate, sample rate or mono/stereo, or to cut out just the part you need. Add up to 10 files at once – each one is converted in the background, so you can keep using the site and download every result as soon as it is ready.

Files are converted on our server: the upload starts only after you confirm, the original is deleted after conversion and the result is kept for 7 days unless you delete it sooner.

Frequently asked questions

How do I convert OPUS to CAF?

Choose or drop your OPUS file, keep CAF as the output and click Convert. After you confirm the upload, our server converts it and shows the progress; then you download the CAF file.

Will the sound lose quality?

We convert at full quality by default: lossless formats stay lossless, and for compressed formats “Auto” keeps the bitrate of the original (at least 128 kbit/s). Converting a compressed file into a lossless format cannot bring back detail that was already removed, but it adds no further loss.

Are the title, artist and cover kept?

Yes. Tags such as title, artist and album are copied to the CAF file whenever the format can store them, and cover art too for MP3, M4A and FLAC. You can turn this off in “Options”.

Can I cut the audio?

Yes. Under “Options” enter a start and/or end time (for example 0:30 and 1:45) and only that part is converted.

Can I convert several files at once?

Yes, up to 10 at a time, each with its own progress. A file can be up to 300 MB and 10 hours long.

What happens to my files?

They are uploaded only after you confirm. The original is deleted as soon as the conversion is finished, and the CAF file is kept for 7 days so you can download it – you can delete it yourself at any time.

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