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How to Combine PDFs Without Losing Quality: Tips and Tricks

kokou adzo



a tablet and a cup of coffee on a table

In today’s digital world, PDFs (Portable Document Format) have become a standard for sharing and preserving documents. Whether you’re working on a project, submitting assignments, or sharing important reports, chances are you’ve encountered the need to merge multiple PDF files into one.

However, when you merge a PDF with another file the PDF combiner software can sometimes cause a loss in quality if you don’t combine PDFs correctly.  PDFs are often used for documents that require precision and clarity, such as research papers, legal contracts, and design portfolios. When you merge PDFs, you want to ensure that the final document remains professional and legible.

In this blog post, we’ll teach how to combine PDF documents and maintain the quality of the original documents.

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Choose the Right Tool

The first step in preserving the quality of your PDFs is selecting the right tool for the job. Several software and online platforms offer PDF merging capabilities. It’s crucial to choose a reputable tool that supports high-quality output.

Some popular options include:

  • CoolUtils PDF Combiner
  • Adobe Acrobat
  • PDFelement
  • Smallpdf
  • PDF Merge

These tools are designed to combine PDF documents without compromising on quality.

Consider the Resolution

Resolution is a critical factor when it comes to maintaining the quality of your PDFs. The resolution determines the sharpness and clarity of images and text in your documents. When merging PDFs with different resolutions, it’s essential to ensure that the final output maintains the highest resolution available.

Most PDF merging tools automatically adjust the resolution to match the highest resolution when they combine PDF files into one. However, it’s a good practice to double-check the settings in your chosen tool and verify that it’s set to preserve the original resolution.

Pay Attention to Formatting

Formatting is another aspect of PDF quality that can be affected when you combine PDF pages. Different PDFs may have varying page sizes, orientations, or margins. To ensure that your final document looks polished and professional, pay attention to the formatting options in your PDF merging tool.

Look for options like “Fit to Page” or “Maintain Original Page Size” in the tool’s settings. These options can help preserve the formatting of individual pages within the merged document.

Handling Compression

Compression is a technique used to reduce the file size of PDFs. While compression can be beneficial for sharing or storing PDFs, it can sometimes lead to a loss of quality, especially when combining PDFs that have already been compressed.

When merging PDFs, be aware of any compression settings in your PDF merging tool. Ideally, you should choose settings that minimize compression to maintain the quality of images and text. Some tools offer options like “No Compression” or “Minimal Compression” for this purpose.

Use PDF/A Format for Preservation

If you’re merging PDFs for archival or long-term preservation, consider using the PDF/A format. PDF/A is an ISO-standardized version of PDF designed specifically for archiving electronic documents. It ensures that documents will be preserved in their original quality for years to come.

When you save your merged PDF, select the PDF/A format if your tool supports it. This format is ideal for legal documents, historical records, and any content that needs to be retained in its original state.

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Test the Output

Before finalizing your merged PDF, it’s a good practice to test the output. Scroll through the combined PDF files, paying attention to images, text, and formatting. Look for any anomalies or quality issues that may have arisen during the merging process.

If you notice any problems, go back to your PDF merging tool and adjust the settings accordingly. Testing the output when you combine PDF files ensures that you catch any quality issues before sharing or submitting the document.

Wrapping Up

PDF combining without losing quality is essential for maintaining the professionalism and readability of your documents. By choosing the right tool, considering resolution, formatting, compression, and using the PDF/A format for preservation, you can ensure that the PDF combination meets the highest standards of quality.

Remember that the key to success lies in attention to detail and selecting the appropriate settings in your PDF merging tool. With these tips and tricks, you can confidently combine to PDF while preserving their quality, ensuring that your documents make a lasting impression.


Kokou Adzo is the editor and author of He is passionate about business and tech, and brings you the latest Startup news and information. He graduated from university of Siena (Italy) and Rennes (France) in Communications and Political Science with a Master's Degree. He manages the editorial operations at

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