Is there a file size or page limit?
Yes, there is a file-size limit: every upload must be under 4.4 MB, and it applies to all plans — Free, Plus, Pro, and Business alike. A larger file is rejected up front, before anything is uploaded, so compress or split a large PDF before uploading. Files under the cap that are very large or image-heavy still convert fine; they just take a little longer to process.
Page and volume limits are separate from file size: without an account you can preview one statement per 24 hours, up to 10 pages. With a free account you can convert up to 3 statements per month, with up to 10 pages per statement. Plus, Pro, and Business raise those limits — 50 statements a month and up to 50 pages per statement on Plus, 200 statements and up to 100 pages on Pro, and 600 statements and up to 100 pages on Business (the 4.4 MB file-size cap still applies). For very large multi-statement PDFs, splitting them per statement period stays within the page limit and also gives the most accurate results.