Unlimited conversions
The daily cap is removed entirely. This is the main reason most subscribers upgrade — batch work runs into a 10-a-day guest limit almost immediately.
Larger files and batches
The per-file size cap rises to accommodate large TIFF scans, PSB composites and long PDFs, and batch size increases to 50 files.
API access
Premium unlocks a REST API for programmatic conversion, with an API key and documented endpoints for submitting jobs and polling status. Useful for build pipelines and CMS integrations.
What does not change
Output quality, resolution and the absence of watermarks are identical on every tier. You are paying for throughput, not for better results.