The free plan supports mp3 file format and provides 5 Hours total storage space (500MB) and 100GB monthly bandwidth, basic podcast stats, etc.
The stereo bit rate and sample rate for audio files are:
Stereo Bit Rate: 128 kbps
Sample Rate: 44.1 kHz
Please note that the free plan users can publish a maximum of 3 episodes per day. The maximum allowed single file size is 100 MB.
You can also upload images in .jpg and .png for logos and banners.
If you need more storage space, you may upgrade your account to the unlimited plan. Please refer to https://www.podbean.com/podcast-hosting-pricing.