10 PDF Tricks Most People Don't Know (But Use Daily Once They Do)

Most people use PDF tools only when they absolutely have to — and they use only the most basic functions. These 10 techniques are used by document professionals but remain unknown to the vast majority of everyday PDF users. Each one solves a real problem that comes up regularly.

1. Check a PDF's Actual Page Count Before Printing

Before printing a long PDF, use PDF Info to see the exact page count, page dimensions, and file size. This takes 5 seconds and prevents wasting paper on a 90-page document you thought was 20 pages — or discovering your printer doesn't support the unusual page dimensions.

2. Extract Just the Pages You Need to Share

When a colleague asks for "the findings from the Q3 report", don't send the entire 60-page document. Use Extract Pages to pull exactly pages 12–18 into a clean 7-page PDF. This protects the rest of the document, reduces attachment size, and shows respect for the recipient's time.

3. Fix Sideways Scans in Under 10 Seconds

Scanned documents frequently come out rotated 90° because the paper was fed sideways. Don't struggle with preview applications — use Rotate PDF to fix all pages simultaneously. Choose 90° clockwise for the most common rotation error from portrait-fed scanners.

4. Reorder Pages After a Duplex Scan

When scanning double-sided documents page by page, many scanners produce interleaved output: odd pages first (1,3,5,7) then even pages in reverse (8,6,4,2). The correct order is 1,2,3,4,5,6,7,8 but the scanner gives you 1,3,5,7,8,6,4,2. Use Reorder Pages to specify the correct sequence and get a properly ordered document.

5. Mark Up Metadata for Better File Search

PDFs are often saved with generic names like "document_final_v3.pdf" and no metadata. This makes them unfindable in large file archives. Use Edit Metadata to add a descriptive title (e.g. "Q3 2025 Sales Report - Europe"), author name, and subject category. macOS Spotlight, Windows Search, and document management systems all index PDF metadata for instant search.

6. Reduce PDF Size Before Emailing Without Quality Loss

Gmail's 25MB attachment limit and Outlook's 20MB limit catch people off guard. Rather than using a file transfer service, use Compress PDF first. For text-based PDFs, Medium compression typically reduces size 20–40% with zero visible quality change. The result is a smaller, equally readable PDF that stays within email limits.

7. Convert a Screenshot to a PDF Report

Need to document a software bug, a website issue, or a step-by-step process? Take screenshots (PNG or JPG), then use PNG to PDF or JPG to PDF to combine them into a single, professionally formatted PDF report. Select images in order, choose A4 or Letter page size, and you have a clean multi-page document in seconds.

8. Verify a Tool Isn't Uploading Your Files

Before using any PDF tool for a sensitive document, verify it's actually private: press F12, click Network, then use the tool. If you see POST requests to an API endpoint during file processing, your file is being uploaded regardless of what the site claims. Folium shows zero file upload requests — only script and font load requests on first use.

9. Remove the Cover Page Before Sharing an Academic Paper

Many academic papers have an institutional cover page that reveals internal identifiers, submission tracking numbers, or preliminary review notes not meant for general circulation. Use Remove Pages to strip page 1 (or any specific pages) before sharing the paper externally. Type 1 in the pages field to remove only the first page.

10. Repair a Partially Downloaded PDF

PDFs that were interrupted during download sometimes won't open, showing "unexpected end of file" or "file is damaged" errors. Before giving up, try Repair PDF. The tool uses pdf-lib's fault-tolerant parser to load whatever content survived the incomplete download and re-save it as a clean file. It won't recover lost pages but often recovers most of the document.