Maximum file size you can upload

Following our best practices guide for audio encoding you can upload podcast episodes up to ~ 4 hours in duration. These files are roughly 1 MB per audio minute.  The max file size you can upload to Castos is 250MB.  

We chose this amount because it offers the best combination of audio quality, file size, and file format for both your listeners and their podcasting apps.

If you already have a media file that has been sent to you as a WAV file or another large format file by an audio editor you can convert it down to a smaller file size using a tool like

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