PDF Won't Open — Causes and Solutions
PDF file won't open? Learn the most common causes and 5 proven solutions to fix corrupted or inaccessible PDF files instantly.
PDF Problems and Fixes
Troubleshooting pages for broken PDFs, searchability issues, printing problems, file corruption, and similar document issues.
PDF Too Large for Email — How to Reduce File Size
PDF too large to send by email? Learn how to reduce PDF file size without losing quality. Compress any PDF under the attachment limit.
Can't Copy Text from a PDF — How to Extract It
Unable to select or copy text from a PDF? Learn why it happens and how to extract text using OCR or by removing copy restrictions.
PDF Prints Wrong Colors — How to Fix Color Issues
Your PDF prints with wrong colors? Learn why colors shift between screen and print, and how to fix RGB-to-CMYK and color profile issues.
PDF Fonts Missing or Displaying Wrong — How to Fix It
PDF showing wrong fonts or squares? Learn how to fix missing embedded fonts and ensure your PDF looks correct on every device.
PDF Pages Rotated Wrong — How to Fix Orientation
PDF pages are upside down or sideways? Learn how to rotate individual or all pages to the correct orientation in seconds.
PDF Form Not Fillable — How to Add Interactive Fields
Received a PDF form you can't fill in? Learn how to add fillable fields or type directly on any static PDF form.
PDF File Corrupted — How to Repair and Recover It
PDF file corrupted or damaged? Our free repair tool fixes broken cross-references, damaged headers, and recovers your document content.
How to Edit a PDF on Mobile — No App Required
Need to edit a PDF on your phone or tablet? Use UnblockPDF's browser-based editor to add text, sign, and annotate PDFs on any mobile device.
How to Merge PDFs with Different Page Sizes
Need to merge PDFs with different page sizes into one document? Learn how to combine letter, A4, and custom-sized pages seamlessly.
PDF Images Blurry — How to Fix Quality Problems
Images in your PDF look blurry or pixelated? Learn why image quality degrades and how to fix or extract high-resolution images.
Forgot Your PDF Password — How to Recover Access
Forgot the password to your own PDF? Learn how to recover access to password-protected PDF files with owner or user password removal.
PDF Won't Print — How to Fix Printing Problems
PDF won't print or prints incorrectly? Learn how to fix print restrictions, blank output, and other common PDF printing issues.
PDF Signature Invalid — How to Fix Verification Errors
PDF signature shows as invalid or unknown? Learn why digital signatures fail verification and how to fix common signature issues.
PDF Slow to Open — How to Speed Up Loading
PDF takes forever to open or scroll? Learn how to optimize large PDF files for faster loading, smoother scrolling, and better performance.
PDF Blank Pages After Scanning — How to Fix It
Scanned PDF shows blank pages? Learn why scanned pages appear empty and how to recover the content with OCR and repair tools.
PDF Hyperlinks Not Working — How to Fix Them
Hyperlinks in your PDF are not clickable or lead to wrong pages? Learn how to fix broken links, missing URLs, and non-interactive links.
PDF Page Order Wrong — How to Rearrange Pages
Pages in your PDF are in the wrong order? Learn how to quickly rearrange, move, and reorder PDF pages with our free online tool.
PDF Formatting Lost After Conversion — How to Fix It
Formatting breaks when converting PDF to Word or other formats? Learn why layouts shift and how to preserve formatting during conversion.
PDF Has Too Many Pages — How to Split It
PDF document too long? Learn how to split large PDFs into smaller files by page range, chapter, or file size — quick and easy.
How to Remove a Watermark from a PDF
Need to remove a watermark from your PDF? Learn how to delete text and image watermarks from PDF documents you own or have rights to edit.
PDF Annotations Not Showing — How to Fix It
PDF annotations, comments, or highlights not visible? Learn why annotations disappear and how to flatten or fix them so they show everywhere.
PDF Form Data Lost — How to Prevent and Recover It
Filled out a PDF form and lost your data? Learn why form data disappears and how to flatten forms to permanently preserve your entries.
Poor PDF Scan Quality — How to Improve Readability
Scanned PDF looks blurry, skewed, or unreadable? Learn how to improve scan quality with OCR, deskewing, and image enhancement techniques.
PDF Not Searchable — How to Add a Text Layer
Your PDF is not searchable? Learn how to add a searchable text layer to scanned PDFs using OCR so you can find, select, and copy text.