How to Check a Digital Diary PDF Before Printing It as a Book
Before ordering a printed book from an existing digital diary, check the exported PDF against the exact book size and print service you intend to use. Review its page dimensions, margins, sequence and font appearance, then assess each photo at the size it will occupy on the page. A PDF that opens without errors can still have pages that are the wrong size, text near the binding, or photos that look soft when enlarged. A careful screen review followed by one printed proof gives you two chances to catch these problems.
Start with the printer’s specifications for your book
Find the print service’s current instructions for the chosen format, trim size, binding and paper. Record the required interior page dimensions and whether the service expects individual pages or spreads. Also look for any page-count rules and directions about bleed—the extra image area that extends beyond the final cut edge. Those requirements vary by product and provider; there is no single set of dimensions or margin values that applies to every book.
For example, Blurb’s PDF-to-book instructions say to use its specification tool for the exact exported PDF measurements for the selected book configuration. They also require individual pages rather than spreads in that workflow. Lulu likewise says the interior PDF’s page size should be set to the intended book size, and that the uploaded file determines the displayed book size and page count. Follow the instructions for your own service rather than copying either provider’s figures. (Blurb’s PDF specifications; Lulu’s print-book instructions)
Verify page size, page count and sequence
Open the final exported PDF, not just the diary in its editing app. Check the document properties or page-size display and compare the dimensions with the printer’s stated requirements. If the PDF contains pages with different dimensions, investigate whether that is expected—for example, a service may handle the cover separately—or whether a page was accidentally exported at a different size. Don’t scale the PDF to force a match until you know what the service expects; scaling can change both page size and the size of its contents.
Then review the page count and order from beginning to end. Look for missing, duplicated or unexpectedly blank pages, and make sure opening pages, dated entries and any closing pages appear in the intended sequence. A diary assembled from separate monthly or yearly exports can be especially easy to reorder accidentally. Check the page thumbnails or navigation pane as well as the full-page view, since a quick scan of thumbnails can reveal a repeated page that is easy to miss while reading.
If your printer provides an online preview after upload, use it as a separate check. In Lulu’s preview, for instance, the reader can turn pages and view margins and trim areas; its instructions also say to check page numbering and the placement of odd-numbered pages. A preview helps reveal how that particular service interprets the file, but it does not replace checking the source PDF against the service’s specifications. (Lulu’s print-book preview instructions)
Inspect margins, trim and binding space
Read the diary page by page with attention to the edges and the inner margin beside the binding. Check whether dates, captions, handwritten-style text, faces or other important details sit close to the trim edge or cross the centre join of a spread. A page can look balanced on screen yet lose part of a letter or photo detail when trimmed or bound. Use the safe-area guidance or template supplied for your chosen book format; do not assume a generic margin measurement will suit every size and binding.
For pages with a photo or background that is meant to reach the edge, confirm that it extends to the required bleed area. If it ends exactly at the trim line, a small shift in cutting can expose a white edge. Blurb’s PDF uploader guidance describes the trim line as approximate and recommends keeping important content away from it; it also advises checking the centre gutter for content that might be obscured or misaligned. Treat those measurements as Blurb-specific guidance, and use your own printer’s template for another service. (Blurb’s PDF preview guidance)
Check font rendering and small text
Read the PDF at normal size to judge how the pages feel, then zoom in on small text, dates, captions and decorative lettering. Watch for missing characters, substituted-looking type, clipping, odd line breaks or letters that have become jagged. If text looks different from the diary’s original layout, reopen the source document and check the export settings before making changes to the PDF.
Font embedding helps preserve the intended appearance when the file is opened or printed on another system. Adobe’s Acrobat guidance recommends embedding fonts when preparing print PDFs and explains that its Preflight tool can inspect font and image properties alongside other print-related features. If you have Acrobat Pro, run an appropriate preflight check and inspect any reported font issues; a passing automated check does not replace visually reviewing the pages. (Adobe’s Preflight guidance)
Judge each photo at its placed print size
A photo’s effective resolution depends on how many pixels it has and how large it appears in the book. As a practical calculation, divide the image’s pixel width by its placed width in inches; do the same for its height. For example, a 1,800-pixel-wide image placed 6 inches wide has 300 pixels per inch across that width. This is an illustration of the calculation, not a guarantee of print quality: focus, compression, cropping and the printer’s process also affect the result.
Check the effective resolution for the photo as placed in the PDF, especially if it has been enlarged or cropped. A small image from a messaging app or a thumbnail saved from a website may contain too few pixels for a large page placement. Adobe describes 300 ppi as a common high-quality print reference, while noting that suitable resolution depends on output and viewing conditions. Print providers can set different requirements, so treat a general reference as a prompt to investigate—not a universal pass/fail threshold. (Adobe’s print-resolution guidance)
Also inspect the PDF itself at high zoom for softness, blockiness and visible pixel edges, then view the photo at approximately its intended physical size on screen if your software supports that. Zooming in can expose artifacts, but screen magnification alone does not tell you exactly how the printed page will look. Avoid judging a photo only by its pixel dimensions or by a resolution number stored in its metadata: its size in the layout changes the effective resolution.
Order and inspect a small printed proof
After correcting any issues in the source diary and exporting again, review the replacement PDF from the beginning. Confirm that your changes did not alter the page count, sequence or layout elsewhere. Upload that version and inspect the printer’s preview before ordering. Where available, order a single proof before committing to a larger quantity; handling the printed book lets you judge paper, small type, photo detail, trim and binding in real conditions.
Use the proof as a focused checklist: compare a few representative pages with the PDF, including the smallest text, the largest photo, a page with content near the inner margin, and any full-bleed design. Turn through the whole book once to catch sequence or omission errors that were not obvious in selected samples. If something is wrong, note the page and what you see, revise the original layout, export a fresh PDF and inspect that file again before ordering. Blurb describes a printed proof as a way to catch issues that an on-screen preview missed; the option and process depend on the service you choose. (Blurb’s project review guidance)
A practical final check
Before placing the order, you should be able to answer yes to four questions: Does the PDF match the selected printer’s specifications? Are the pages in the right order with important content clear of trim and binding areas? Do fonts render correctly, and do photos look suitable at their placed size? Have you reviewed the printer preview and, when practical, a printed proof? If any answer is uncertain, return to the source diary, correct the layout or export, and check the new PDF before proceeding.