Troubleshoot an image-based PDF that is heavy or difficult to read by checking duplicates, source detail, page proportions and unnecessary image content.
Identify the actual problem
File size and readability are related, but they are not the same issue. A PDF may be small and unreadable because each page contains a very long screenshot. Another may be large because it includes many detailed photographs that are perfectly clear.
Open the downloaded file and inspect the troublesome pages. Check whether the text was already blurry in the source or only became difficult to read after fitting it onto the PDF page. Keep the originals available for comparison.
Remove unnecessary pages and surroundings
Return to the image list and remove duplicates or unrelated pictures. If a photo contains a small document surrounded by a large desk, crop the source before converting it. This lets the useful content occupy more of the final page.
Images to PDF does not crop files itself. Use Scan to PDF for paper photographs needing manual crop controls, or prepare edited copies in your image editor. Check that the crop does not remove page numbers, signatures or other required information.
Avoid repeated compression as a repair
Working images are already scaled to a maximum 2,400-pixel longest edge and encoded as JPEG. Compressing the downloaded PDF's page images again is not a guaranteed improvement and can make fine text less clear.
For large photo collections, reduce the number of pages or prepare appropriately sized source copies. For an extremely tall screenshot, divide it into readable sections before conversion. Do not reduce quality so far that the document stops serving its purpose.
Create a new file and verify it
Generate another PDF after changing the list or source images. Compare its size and inspect the same problem areas as before. If your recipient requires searchable or selectable text, this image-based workflow cannot provide it. Use a text-based export from the source application when possible, while retaining the original images for reference.