PDF guides

In-depth, practical answers to the problems you run into when working with PDFs: from shrinking files and redacting properly to signature types and archive formats.

• Why Your PDF Is So Large and How to Shrink It Safely

  Learn what makes a PDF heavy, from photos and fonts to scans and leftovers, and how to cut its size without making it blurry or unreadable.

  6 min read

• Turning a Scanned PDF Into Searchable Text With OCR

  Why scanned PDFs can't be searched or copied, how OCR fixes that, and the scanning habits that make recognition far more accurate.

  6 min read

• PDF Passwords Explained: Open Password vs. Permissions

  What a PDF open password protects, why permission restrictions are weaker than they look, how AES-256 differs from RC4, and what to do if you forget it.

  5 min read

• How to Redact a PDF So the Hidden Text Is Really Gone

  Why black boxes and highlights don't remove text from a PDF, where hidden data lurks, and a checklist for sharing documents with personal data safely.

  6 min read

• Signature Image, E-Signature or Qualified Signature?

  A plain-language look at drawn signatures, simple and advanced e-signatures and qualified signatures under eIDAS and Turkish law, and when each fits.

  6 min read

• Why PDF to Word Conversion Breaks Layouts and How to Fix It

  PDFs store positioned text, not paragraphs. Learn what converts to Word cleanly, what doesn't, and how to prepare a file and tidy up the result.

  6 min read

• PDF/A Explained: Levels, Rules and When You Need It

  What PDF/A is, how levels 1b, 2b, 3b and the a and u variants differ, what the standard forbids, and how to check that an archive file really conforms.

  6 min read

• Merge or Split? A Practical Guide to Organizing PDF Files

  Learn when to combine PDFs and when to break them apart, how to order pages, split by range, size or bookmark, and name the files you send.

  7 min read

• Filling PDF Forms: Interactive Fields, Flattening and Signing

  How interactive and flat PDF forms differ, how to fill fields, checkboxes and choices, add missing fields, flatten the result and sign before sending.

  7 min read

• Watermarks and Page Numbers: Preparing PDFs for Sharing

  When a watermark helps and what it cannot stop, how to set opacity, position and layer, and page numbering conventions like skipping the cover.

  6 min read

• PDF to Image and Back: DPI, Formats and File Size Explained

  What 72, 150 and 300 DPI really mean, when to use JPG, PNG or WEBP, and how to set page size and margins when turning photos and scans into a PDF.

  6 min read

• How to Design QR Codes That Scan Reliably in Print

  Size, quiet zone, contrast, error correction and logos: what makes a printed QR code scan on the first try, and how to test it before a print run.

  7 min read

• EAN-13, UPC, Code 128 and More: Choosing the Right Barcode

  What each common barcode type is for, why store products need GS1 numbers, how check digits work and how big to print a barcode so it scans.

  7 min read

• Using Online PDF Tools Safely: What to Check Before You Upload

  What happens to files you upload, what a privacy policy should tell you, how to handle IDs, contracts and health records, and when offline tools are wiser.

  7 min read