1. Storage and bandwidth limit: The free plan provides 5 Hours total storage space (500MB) and 100GB monthly bandwidth.

2. Episode limit: The free plan users can publish a maximum of 3 episodes per day. The maximum allowed single file size is 100 MB.

3. File format: The free plan supports mp3 and m4a for audio files

4. The stereo bit rate and sample rate: 

Stereo Bit Rate:  128 kbps

Sample Rate:  44.1 kHz

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.