What is the DPI Resolution Value of PDF Document? - ByteScout
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What is the DPI Resolution Value of PDF Document?

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We all use PDF files for one activity or the other. These documents have a significant level of functionality across different fields. In fact, most individuals and businesses prefer using PDF files as they are easier to use and more professional.

However, only a few know the internal workings of the PDF file. In particular, many don’t understand the DPI of the PDF file. PDF is a vector-based format entity and there are no “classic” dots (pixels) as one may find in JPG, PNG, or TIFF pictures. On the opposite, PDF format internally uses something similar to computer programs that can draw lines, circles, text, forms, etc. So PDF file is automatically executed to create a picture for various DPI (Dots Per Inch) targeting screens or printing devices depending on specific monitors or printing devices accordingly.

Diving a little deeper, within a typical PDF file, what you have within is a scaling command and raw imagery, which fits within a slot on each page. The larger the imagery, it means the slot is smaller. Therefore, you can easily zoom pages while printing high-resolution documents. As discussed earlier, the larger the file, the bigger the image. Also, you have to find the balance between the slots and the raw imagery size. Doing this allows you to get the right PDF file with a suitable resolution.

All too often, DPI and PPI are used interchangeably even though the means are different. Specifically, DPI (Dots Per Inch), is that measurement more refers to the resolution of a computer printer. While PPI (Pixels Per Inch) or pixel density is synonymous with samples per inch.

In general, DPI is considered a measure of the number of dots, which can be aligned on a line under a one-inch span. This measure could be described in terms of an image or a video scanner dot concentration and spatial printing. With particular reference to PDF, it refers to the measurement of the resolution of a computer display, correlated to the size of the display in inches and the total number of pixels in the horizontal and vertical directions. For instance, a 300 dpi PDF is a document that contains raster information sized to 300 PPI at the defined output dimensions.

Why is it Important to Know the DPI Resolution of a Document?

PDF files do not have a single DPI value, all bitmap page objects have separate resolutions, therefore, course vector objects such as text have no resolution at all. However, this flexibility allows PDF documents to be printed and displayed with the highest quality even for super large sizes. If you compare this to JPG, and PNG pictures then pictures are just a set of pixels and you will see blurring effects when pictures are zoomed in or increased in size.

PDF files were designed to look crisp and clean but not bit-mapped or pixelated. Despite this, better-quality PDF files are usually larger. Many designs and photo apps suggest that files should be saved as PDFs. This is a clear distinction from images, which are bit-mapped. Therefore, small images get stretched while the pixel becomes significantly more prominent. Though having clunky PDFs are great for printing but it might useful for other purposes. For instance, you might need to transfer files or upload them into a cloud network. One way to solve this is to convert PDFs into another format while maintaining a high DPI.

Additionally, the better the quality of the PDF file generated, the larger the file. As such, most PDF file generation applications give users the opportunity to create files either for printing or on-screen use. It will also benefit you to make larger files for printing if space is not an issue for you.

How to Convert Documents to Have a Better DPI for High Quality?

So if you need to convert PDF into a JPG, PNG, or TIFF picture then you should use PDF Renderer SDK and just set the size and resolution of the output picture with a given resolution. And the SDK will render PDF documents into a picture with the desired picture resolution (300 to 600 DPI for high-quality pictures). So you should not worry about the resolution of the source PDF but just need to define the output picture size with the same aspect ratio as the source PDF. It allows printing from within the application.

Each of the file formats has its own benefits. JPG files offer adjustable compression with high resolution and smaller file sizes. PNG files may be slightly bigger than JPG but these files have greater compressibility and also supports transparency. TIFF files allow lossless compression which makes it possible to edit and resave without losing image quality. It can also convert PDF to BMP, PDF to EMF, and PDF to multi-page TIFF.

For simplicity, when you are creating a PDF document using tools like PDF SDK (PDF Generator SDK) then these tools are using coordinates calculated using 72 dots per inch (but this can be changed using . The Resolution property in the SDK). But, again, this “default” DPI value in the PDF Generator SDK tool is just for having a way to comfortably use coordinates to add lines, text, form elements, images (and other object types) and you may create thumbnail or print PDF using any other required resolution and output size.

PDF Renderer SDK is great to use since it renders different fonts with any styling, and renders vector graphics as well as images. It works offline and doesn’t require a constant Internet connection. It also does not require any other PDF reader software such as Adobe Reader to be installed. It supports .NET, ASP.NET, and Visual Basic 6 applications with both x86 and x64 modes.

How to Change PDF Resolution?

As discussed, the DPI can affect the quality of the output when printing. The settings that will change the appearance of PDF or image output will involve either compressing the file or changing the DPI. Compressing the files can be done right within a PDF reader.

The DPI setting of a printer will relay information to the printing program which has a dialogue box where you can change the DPI settings as well as other parameters. When you go to printing preferences in the printing program, find the advanced settings. Once that is opened you can change the DPI under Graphic-Print Quality before printing the document. On average a DPI of 300 is decent and offers a good quality output and a reasonable file size.

The best way to change your document is to export it as a high-resolution PDF. To do so in Adobe Acrobat, select the document and then select File > Export As > High-Resolution PDF.

If you’re not using Adobe Acrobat, you can try one of the many online PDF converters that will allow you to convert your file to a high-resolution PDF. Once you have a high-resolution PDF, you can open it in any PDF viewer and change the viewing size to whatever you like without losing quality. If you want to know how to make a PDF high-resolution for printing, changing the PDF resolution can help.

How to Check PDF Resolution

Adobe Acrobat’s “Properties” option is found under the “File” menu after opening a PDF. A new window opens with PDF file size, creation date, and security threats. Under “General” is a “Resolution” section.

PDF resolution is measured in dots per inch (DPI). Higher DPI prints more accurately and precisely. To measure a PDF’s resolution, you must know its DPI.

There are a few techniques to check the PDF’s DPI setting. Open the PDF in Acrobat and choose “File” then “Properties.” This opens a new window with PDF info. Find “Resolution” under “General.” This shows the DPI setting.

Trying printing the PDF at multiple settings until you find one that works. Too much DPI might reduce print quality.

How to Check the DPI of PDF

Open the PDF in Acrobat Reader and go to “Document Properties” under the “File” menu to see the DPI. Find the “Printing Resolution” area by selecting the “Advanced” option. The DPI will be listed under “Horizontal Resolution” and “Vertical Resolution.”

How to Increase PDF Resolution

There are a few things you can take to ensure a clear, high-resolution PDF when scanning a document or image. Also it answers the question of how to make a PDF high-resolution for printing.

Use a good scanner. This guarantees a high-resolution PDF. If scanning from a home printer, increase DPI (dots per inch). Office scanners need 600 DPI. Reduce the DPI of PDF to a lower PDF resolution.

Using Adobe Acrobat’s “Preflight” tool, you can boost a scanned PDF’s resolution. This program fixes PDF issues that could cause low resolution. Adobe Acrobat File > Preflight your PDF. After Preflight finishes, choose File > Save As > “Optimized PDF” This makes your PDF higher-resolution.

How to Lower the Resolution of a PDF

PDFs can have their resolution decreased in a few different ways. The PDF can be opened in an editing program like Adobe Acrobat and then saved as a lower-resolution PDF. Another way is to use a free online PDF converter like SmallPDF.com to convert the PDF to a lower-resolution version. This reduces the DPI of PDF.

How to Create High-Resolution PDF

Adobe Photoshop CC allows you to save your work into a PDF file that may be printed. To select CMYK, type enter, followed by Mode. Your project needs some simplification. I.M. files should be dropped into the layers palette. It seems as though your guise was preserved. To begin, select Save as an option. Factors that reduce the DPI of PDF must be seen. Photoshop PDFs can be formatted in a variety of ways. Examine the output by reading Adobe’s PDF Quality Preset. To download the PDF, select the “Save As” option (the checkbox).


A PDF file is a vector-based file, which does not have a single DPI. Also, you get to have the added flexibility of printing or viewing PDF documents with the best quality. However, the higher the quality of the PDF file, the larger the file, while the lower the quality, the lower the size of the file. Therefore, you have to decide on what quality of PDF file you require and for what purpose.
Furthermore, you always have the option of increasing the DPI of a PDF file. Doing this allows the quality of the file to increase significantly. This conversion can be carried out using the PDF Renderer SDK. Additionally, such a conversion can be done at the point of printing.


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