A PDF that looks fine on screen but comes out blurry from the printer has a resolution problem — either the images in the document don't have enough pixels for print output, or the print driver is scaling or rasterizing the content in a way that degrades it. The fix depends on which of these is actually happening.
Check the Printer Quality Settings First
Before concluding the PDF is at fault, open the print dialog and look at the quality settings. Most office printers default to "Draft" or "Normal" mode to save ink, and the difference between Draft and High Quality is significant. In the print dialog, click Properties or Printer Settings and change the quality to Best or High. Print a test page and compare — if the output sharpens noticeably, the printer settings were the issue, not the file.
Low-Resolution Images Are the Most Common Cause
Screens display at 72-96 pixels per inch. Printers need 200-300 dots per inch to produce sharp output. An image that looks perfectly crisp at screen resolution will print soft because there simply aren't enough pixels to fill the physical print area at the required density.
This is especially common with PDFs that contain images sourced from websites, screenshots, or photos shared over messaging apps — all of which tend to be compressed to screen-appropriate sizes. If the blurriness is concentrated in photos or graphics while text prints sharp, low image resolution is almost certainly the cause.
The fix requires going back to the source document and replacing low-resolution images with higher-resolution versions before re-exporting the PDF. Upscaling low-res images in the PDF doesn't add missing pixel data — it just stretches what's already there, making the blurriness worse rather than better.
Over-Compressed PDF Images
If the PDF was compressed very aggressively before printing, the compression may have degraded image quality to the point where it shows in print. A document that's acceptable on screen at 100% zoom can look clearly degraded when the printer reproduces it at full physical size.
If this is the case, go back to the original uncompressed version and print from that instead. For documents where you only have the compressed PDF, there's no way to recover lost image quality — the data that was discarded during compression is gone. The PDF Compression step needs to happen after printing, not before.
The Print Scaling Setting Is Rasterizing Vector Content
Some PDF viewers rasterize the entire document into a large bitmap image before sending it to the printer — a process that can introduce blur even for text and vector graphics that would otherwise print sharp. This is more common with browser-based viewers than dedicated desktop applications.
If text is blurry in the print output even though it looks sharp on screen, try printing from Adobe Reader instead of Chrome or Edge. Adobe Reader sends vector content as vector data to the printer rather than converting everything to an image first, which produces significantly sharper text output on most printers.
When the PDF Is a Scan
Scanned PDFs printed back out will only be as sharp as the scan resolution allows. A scan at 150 DPI printed on an office printer produces noticeably softer output than one scanned at 300 DPI. If the source document was scanned at low resolution, the only real fix is to rescan it at a higher DPI setting and use the new scan for printing.