The PDF Cheat Sheet: 25 Things You Didn't Know You Could Do

Most people think of PDFs as read-only documents you open, scroll through, and maybe print. In reality, PDF is one of the most capable document formats in existence — it supports encryption, embedded forms, digital signatures, OCR, structured accessibility data, archival standards, compression, and much more. You don't need to know all of it. But some of these 25 capabilities will save you time, money, or frustration the next time you encounter a PDF problem. Many are completely free. Here they are.

Working with Pages

1. Merge multiple PDFs into one. Combine any number of PDFs in any order — free, in your browser, with no file size limits. Drag-and-drop to set the order before merging. Try the Merge PDF tool.

2. Split a PDF into individual pages or sections. Pull out specific pages, extract a range, or break the whole document into one file per page. Works without losing image quality or formatting. Try the Split PDF tool.

3. Reorder pages by dragging thumbnails. Got a scanned document where page 5 ended up before page 2? Drag the thumbnails into the correct order and download the rearranged file. No need to go back to the source document. How to reorder pages.

4. Delete specific pages. Remove a blank page, a cover page you don't need, or any range of pages from a large document — free. How to delete pages.

5. Rotate pages and save the rotation permanently. A lot of people rotate pages in their viewer but don't realize the rotation isn't saved. Use a tool that saves the rotation to the file so it opens correctly everywhere. Rotate Pages tool.

6. Extract just a few pages into a new file. Don't need to split the whole document — just need pages 7 through 12 as a standalone PDF? The extract workflow gets you there in seconds. How to extract pages.

Editing and Annotating

7. Add text to any PDF without converting it. Even a flat, non-fillable PDF can have text placed on top of it using an add-text tool. Labels, corrections, dates, names — all without opening the original Word or InDesign file. Try the Add Text tool.

8. Add a watermark. Stamp DRAFT, CONFIDENTIAL, FOR REVIEW ONLY, or a custom logo on every page — at any opacity, size, and position. Try the Watermark tool.

9. Add page numbers. Legal submissions, reports, and bound documents need page numbers. You can add them in any position, with any format (Page 1 of N, Roman numerals, etc.) without reopening the source file. Try the Page Numbers tool.

10. Crop a page to change its visible area. Trim scanner borders, remove excess whitespace, or resize a slide to fill the page — without permanently deleting the underlying content (which stays hidden beyond the crop box). How to crop a PDF page.

11. Flatten a PDF to lock all annotations permanently. Flattening merges form fields, annotations, and stamps into a single layer that can't be removed. Essential before archiving a signed or annotated document. How to flatten a PDF.

12. Edit existing body text — with paid software. This one surprises people: free tools can add text on top of a PDF, but editing a word that's already in the document requires a PDF editor. Wondershare PDFelement and UPDF both handle this well. Free vs. paid PDF software — the full breakdown.

13. Permanently redact sensitive content. Drawing a black box over text doesn't remove it from the file — the text is still there and copyable. Real redaction deletes the content from the underlying data permanently. Always use a proper redaction tool for this. How to redact a PDF correctly.

Converting and Extracting

14. Convert a PDF to an editable Word document. For text-based PDFs, this conversion is reliable and free. For scanned PDFs, you'll need OCR first. PDF to Word tool.

15. Convert a PDF to Excel. Tables in PDFs can be extracted as spreadsheet data — the structure is preserved, saving you from retyping rows of numbers. PDF to Excel tool.

16. Extract PDF pages as images. Convert any page — or all pages — to JPG or PNG at a resolution you choose. Useful for embedding PDF content in presentations, social media, or websites. PDF to JPG tool.

17. Make a scanned PDF searchable with OCR. A scanned PDF is just an image — you can't select text, search it, or copy from it. OCR (optical character recognition) reads the image and converts it to real, selectable text. PDF OCR tool.

18. Extract all text as a plain text file. Need the words out of a PDF for translation, AI analysis, database import, or compliance review? Extract the full text in one step without copying page by page. Extract Text tool.

19. Convert images into a single PDF. Combine JPGs, PNGs, and other image formats into one PDF document — with full control over page order and size. Great for scanned receipts, photos, and multi-image submissions. JPG to PDF tool.

Security and Privacy

20. Password-protect a PDF with 256-bit encryption. Any PDF can be encrypted so it requires a password to open. 256-bit AES encryption — the same standard used in banking — is available for free. How to password-protect a PDF.

21. Set permissions to restrict what recipients can do. Beyond password protection, PDFs support granular permissions: allow reading but not printing, or printing but not copying text, or filling forms but not editing the document. PDF permissions explained.

22. Remove a password from a PDF you own. If you know the password, removing it takes seconds — no cracking required. How to remove a PDF password.

23. Strip metadata before sharing. Every PDF carries hidden metadata: the author's name, the software it was created with, revision history, and sometimes the original filename. Remove this before sharing sensitive documents. How to view and edit PDF metadata.

Advanced Capabilities

24. Convert a PDF to PDF/A for permanent archiving. PDF/A is the ISO standard for long-term document preservation — it embeds all fonts, prohibits encryption, and ensures the file will render identically in 50 years. Government agencies, law firms, and healthcare organizations use it for permanent records. What is PDF/A and when do you need it.

25. Use AI to summarize, chat with, and extract data from a PDF. The newest generation of PDF tools — including UPDF — lets you ask questions about a document's content, get a structured summary, and extract specific data points without reading the whole file. Load a 200-page contract and ask "what are the termination clauses?" in plain English. AI and PDF — the full guide.

The Quick Reference