Other PDF Issues

How to Increase the DPI and Resolution of a PDF File

Emma Brown Oct 19, 2026 868 views

Question details

The user wants to know how to increase a PDF's resolution (e.g., from 600 DPI to 1,600 DPI) to achieve a higher print or display quality.

How to Increase the DPI and Resolution of a PDF

Product: PDF
Device & OS: not provided
Scenario: The user has a standard or low-resolution PDF and needs to convert or recreate it at a much higher resolution (such as 1,600 DPI) for specific quality requirements.
Observed behavior: Changing the DPI settings on an existing PDF with raster images does not improve the actual visual quality, prompting the need for a proper method to handle high-resolution PDF creation.

Before you start

Identify the contents of your PDF. If it contains bitmap (raster) images, you will need the original high-resolution source files to genuinely increase the DPI, as artificially upscaling low-resolution images will only inflate the file size without adding detail.

Solution 1Recommended

Recreate the PDF from High-Resolution Source Files

The only effective way to genuinely increase a PDF's DPI without quality loss is to recreate the document using original, high-resolution source materials.

You cannot add missing detail to an image originally scanned or created at 600 DPI simply by changing its DPI setting in a software tool.

Vector graphics and text are resolution-independent and will automatically scale perfectly, but any existing rasterized bitmap images must be rescanned or exported again.

Locate original assets

Find the original physical documents, high-resolution photographs, or the source text files (such as Word or Illustrator documents) used to create the original PDF.

Rescan or re-export at target DPI

If using a scanner, adjust the scanner settings to capture the physical document at your target resolution (e.g., 1,600 DPI). If exporting from a design software, set the rasterization or export DPI to 1,600.

Generate the new PDF

Compile these newly created high-resolution assets into a fresh document and export it as a high-quality PDF. Ensure your PDF creation software is set to 'High Print Quality' so it does not compress the images during export.

Recreate the PDF from High-Resolution Source Files

Raster vs. Vector Graphics: Increasing the resolution of existing bitmap images in a PDF will enlarge the file size significantly but will not improve actual image quality. Only vector elements (like standard fonts and shapes) can be exported to higher resolutions dynamically.

Create High-Resolution PDFs with WPS Office

WPS Office offers a comprehensive suite of PDF tools, making it easy to convert, create, and merge high-quality PDFs from original source documents without losing image resolution or formatting.

1. Open WPS Office: Launch WPS Office and navigate to the 'PDF' tab on the main dashboard to access the PDF toolset.
2. Select the creation tool: Click on 'Create PDF from File' or 'Image to PDF', depending on the format of your high-resolution source materials.
3. Import source files: Select the high-resolution images or the original office documents you want to include and import them into the workspace.
4. Export as High-Quality PDF: Arrange your pages as necessary, click 'Export to PDF', and ensure you do not select any extreme compression options so your final PDF retains its high DPI.

Easily convert original Word, Excel, and PowerPoint files into high-quality PDFsFully compatible with Microsoft Office formats ensuring seamless document migrationAdvanced PDF creation tools that preserve native vector text and graphic clarityFree and lightweight alternative for standard PDF editing and viewing needs

microsoft office alternative - wps office

Frequently Asked Questions

Why does my PDF look blurry even after saving it at a higher DPI?

If the original images inside the PDF were low resolution (e.g., 72 or 300 DPI), saving the file at a higher DPI (like 1,600 DPI) only stretches the existing pixels. The missing visual detail cannot be magically restored, resulting in a blurry but much larger file.

Can I increase the resolution of the text in my PDF?

Standard text in a PDF is vector-based, which means it is resolution-independent. It does not have a set DPI and will automatically scale and print cleanly at any resolution without needing manual adjustments.

Will artificially increasing a PDF's DPI increase the file size?

Yes. If you force an upsample on raster images from 600 DPI to a higher DPI, the file size will increase significantly because the software is generating extra pixels, even though the visual quality remains exactly the same.

PDF Troubleshooting