This guide separates checks that can be demonstrated in code or downloadable examples from checks that still need a person and a particular printer. It is a release checklist, not a claim that every setting combination has been manually printed or visually inspected.
1. Generate the file through the public workflow
A useful test begins at the same endpoint as a visitor's download. A selected paper size, layout, content settings, and—where a puzzle uses one—a fixed variation number should pass through the public workflow. Testing only an internal drawing method can miss a broken download route, filename, locale, or submitted control.
For this check we created three A4 examples on 20 August 2026: a maze with its solution, a Sudoku with an answer page, and a mixed-math worksheet with answers. These are normal generator outputs, not hand-redrawn marketing mockups.
2. Verify the sample document, not just its filename
A file ending in .pdf proves very little. The linked samples can be checked for a valid PDF header, parser readability, page count, and reported page dimensions. A4 is approximately 595 × 842 PDF points; US Letter approximately 612 × 792 points. A swapped or silently rescaled page is a failure even when it looks plausible in a browser preview.
Automated request tests can also check the response type and download name. These checks catch routing mistakes such as an error page being saved with a PDF extension. They do not prove that every visual option is correct.
3. Render sample pages back to images
Technical validity does not detect a heading clipped by a margin, a maze squeezed into a corner, or an answer key extending beyond the page. Rendering selected finished PDFs as images makes those defects visible downstream of generation.
For a manual review, inspect outer margins, title and footer clearance, writing space, line contrast, alignment, and the relative size of the main activity. Check every page of the particular sample under review, including answer pages. This sample-based check is useful evidence, but it is not exhaustive coverage of every generator option.
4. Check the content and its answer key together
For worksheets, a clean layout does not compensate for a wrong key. The application derives math answers from the generated problems, checks Sudoku solution counts while removing clues, and solves a generated maze route in code. Those implementation checks cover defined properties; they are not a substitute for reviewing important teaching or assessment material.
Fixed seeds make these failures reproducible. If variation 48201 exposes a problem, the same input can be generated again after a change. Random output is useful to a player; deterministic output is essential to debugging and to a teacher who wants replacement copies of the same activity.
5. Compare the on-page preview with the export
The preview is a planning aid, not the printable document itself. A focused comparison should cover the title, selected difficulty, orientation, counts, answer-key state, and dominant proportions. Pixel-perfect identity is not expected because the preview is responsive while the PDF has physical dimensions.
This comparison can expose defects such as a full-size PDF paired with an undersized preview or a control that changes on screen but is not reflected in the export. The downloaded PDF remains the version to inspect before printing.
6. Run your own print check when physical scale matters
Image rendering cannot reproduce your printer margins, ink or toner contrast, and scaling defaults. Where measured spacing matters, print one page at 100% / Actual size on matching paper and use a ruler to confirm the grid or line spacing before printing a batch.
No test on one printer represents every device. Borderless settings, driver-added margins, and “Fit” options vary. Paperka places content inside page margins, while the A4 versus US Letter guide explains the remaining printer-side checks.
What this evidence does—and does not—prove
The example PDFs let you inspect three actual outputs. The checklist describes repeatable checks, and fixed variation numbers make the two puzzle examples reproducible. The evidence is limited to those files and the properties checked; it does not prove every generator state, guarantee printer compatibility, or promise that a difficulty label will feel identical to every learner.
If an example renders incorrectly in your viewer, or your generated file differs from the selected controls, use the contact page and include the tool, paper size, and variation number. Those details turn a vague report into a case we can reproduce.