How to Merge PDF Files and Combine Images into One PDF

An online merger is the quickest option when you don't have PDF software installed, and it works the same on Windows, Mac, Linux and phones:

1. Open the tool: Go to the Profi PDF Merge PDF tool
2. Upload your files: Select your PDFs. JPG and PNG images can go in the same file, so you can combine scans, photos and PDFs
3. Arrange the order: Drag the files into the order they should appear
4. Merge and download: Get one PDF with all the pages

Best for: Quick tasks, occasional use, and when you don't have specialized software installed.

Every Mac can merge PDFs with the built-in Preview app, without uploading anything:

1. Open the first PDF: Double-click it to open it in Preview
2. Show thumbnails: Choose View > Thumbnails to open the page sidebar
3. Add the other files: Drag the other PDFs (or images) from Finder into the sidebar, dropping each where it should go
4. Reorder pages: Drag thumbnails up or down until the order is right
5. Save a new file: Choose File > Export as PDF so the original stays unchanged

Windows has no built-in way to merge PDFs, and "Microsoft Print to PDF" can only print one document at a time. Your options:

• Online: The Profi PDF Merge PDF tool runs in the browser, with nothing to install
• Adobe Acrobat (paid): Use the "Combine Files" tool, add your files, arrange them and click Combine
• Foxit PDF Editor (paid): Offers a similar "Combine Files" feature
• PDFtk (free, command line): pdftk first.pdf second.pdf cat output merged.pdf
• qpdf (free, command line): qpdf --empty --pages first.pdf second.pdf -- merged.pdf

To combine documents of different types, turn each one into a PDF first, then merge the PDFs. Images can go straight into the merge.

1. Convert Office files: Use Word to PDF, Excel to PDF or PowerPoint to PDF, or choose File > Save As > PDF in the Office app
2. Collect everything: Put the PDFs and any JPG or PNG images in one folder
3. Merge: Upload them all to the Merge PDF tool and set the order

Choosing the Page Order

• Job applications: Cover letter, resume, then certificates and work samples
• Reports and proposals: Summary first, main document next, appendices and supporting files last
• Records and receipts: Chronological order, so the newest is easy to find at the end

Tip: Number the files before uploading (01-cover.pdf, 02-resume.pdf…) so they sort into the right order straight away.

Even experienced users encounter challenges when combining PDFs. Understanding these common issues and their solutions will help you achieve consistent, professional results.

File Compatibility Problems

Issue: Some PDFs won't merge or cause errors during processing.

Solutions:

• Update your PDF software to the latest version
• Try converting problematic files to a newer PDF format
• Check for password protection: unlock protected PDFs before merging
• Verify that files aren't corrupted by opening them individually

Large File Performance Issues

Issue: Merging process is slow or fails with large documents.

Solutions:

• Compress individual PDFs before merging
• Process files in smaller batches
• Close other applications to free up system resources
• Consider using desktop software instead of online tools

Formatting and Layout Problems

Issue: Merged document has inconsistent formatting or layout issues.

Solutions:

• Ensure all source PDFs use similar page sizes
• Check that fonts are embedded in the original documents
• Verify color profiles match across all files
• Use professional software for complex document structures