How to convert PNG to PDF: combine multiple images into one PDF file

When using pdfFiller as a PNG to PDF converter, you can upload and arrange images, then download them as a single PDF document on any device.

• Upload your PNG files to your pdfFiller account, separately or in bulk.
• Arrange pages, set orientation, and make modifications.
• Convert and download a high-quality document in a few clicks.
• Your files are processed in a secure, encrypted account.

Key takeaways

Here’s a quick overview of the key points you should know about converting PNG to PDF:

• PNG is a lossless image format that excels at preserving sharp details, making it perfect for screenshots, diagrams, and branding materials.
• Converting PNG files to PDF provides a universally accessible format that’s easy to share, print, and archive.
• With pdfFiller, you get an all-in-one PDF solution to create, edit, sign, and securely store documents from any device.

Introduction

PNG (Portable Network Graphics) is a versatile, lossless image format that preserves fine details and supports transparency. It’s a popular choice for screenshots, logos, icons, web graphics, and technical diagrams, thanks to its ability to maintain sharp edges and clear, readable text.

Sometimes the conversion becomes essential, for example, when you’re compiling multiple images into a single document, preparing files for professional printing, or creating a polished, client-ready document. Instead of sending multiple image attachments via email, combining PNG files into a single PDF streamlines organization and presentation.

pdfFiller converts any file format to PDF, allowing you to arrange pages, merge files, and download them without installing additional software. Plus, pdfFiller offers secure storage, advanced editing tools, and legally binding eSignature workflows, making it an all-in-one solution for business needs. Visit our Wikipedia page for a comprehensive view of the product and the company.

Why convert PNG to PDF?

PDFs are usually smaller than PNGs, making them easier to share and store, especially when combining multiple images into one document. But the reasons to apply conversion are not limited to file size only, and below we consider more examples.

Why combine multiple graphics into one document?

When you work with multiple PNG files, sharing them separately can create confusion. Files may arrive out of order, or recipients may miss attachments.

While converting, you can:

• Combine multiple PNG files into a single PDF.
• Keep pages in a specific order.
• Present visuals as a structured document.

This approach works well for reports, proposals, and documentation packages. It ensures the recipient views the content exactly as intended.

Why use PDF as a professional document format?

PDF is a universal document format, popular across industries for its ability to preserve layout, fonts, and formatting across operating systems such as Windows and Mac. For our readers interested in converting files on a PC, we offer a separate guide with detailed instructions for a seamless experience on your laptop.

When you convert PNG files to PDF format, you:

• Create a professional file suitable for clients and partners.
• Ensure consistent display across web browsers and devices.
• Prepare documents for printing without layout shifts.

How does the conversion improve sharing and compatibility?

PNG image files can be large and may not open the same way on every device. PDF files are optimized for viewing and printing in most browsers and on any mobile device.

An online tool makes it easier to:

• Share one file instead of several images.
• Reduce file size if needed.
• Maintain quality while improving compatibility.

Why use PDF for archiving and security?

PDF supports security features that standalone image files do not. After the conversion, you can add:

• Password protection.
• Access controls.
• Watermark elements for branding or document control.

pdfFiller also provides encrypted storage and compliance with global standards, including GDPR, HIPAA, SOC 2, and PCI DSS. For legally binding workflows, every signed PDF document includes a verified Audit Trail and digital certificates.

PNG vs. JPEG for PDF conversion

When preparing image-to-PDF workflows, many users ask whether to use PNG or JPG files before conversion.

What are the technical advantages of PNG?

PNG is a lossless format. This means it preserves full resolution and does not discard data during compression.

The advantages include:

• Sharp text and graphics.
• Support for transparency.
• Better quality for screenshots and UI captures.

If your PNG image includes text, diagrams, or technical details, the conversion helps retain clarity.

What are the JPEG technical advantages?

JPEG uses lossy compression, which reduces file size but may affect quality. It is suitable for photographs where minor quality loss is acceptable.

JPEG advantages include:

• Smaller file size.
• Efficient storage for large photo collections.
• Faster upload in some cases.

If you are working with photography, converting JPG to PDF may result in an optimized file size.

File size comparison

PNG files are usually larger than JPG files because they preserve more data. When you convert multiple PNGs, the resulting PDF document may also be larger.

However, modern converter tools let you balance quality and file size during conversion. You can compress images slightly while maintaining readability.

Quality comparison for different content types

Use this simple comparison when deciding between PNG and JPEG before converting:

When should you use PNG vs. JPEG?

Choose PNG if you need:

• Clear text.
• Transparency.
• No compression artifacts.

Choose JPEG if you need:

• Smaller file size.
• Many photos in your documents.
• Faster upload for large batches.

How to convert PNG images to PDF with pdfFiller

The automatic file conversion in pdfFiller is smooth and takes minutes, together with file upload and general modifications you may need.

Follow these steps:

1. Upload PNG images

Go to pdfFiller and sign up or log in to your account. From the dashboard, select Add new and choose your PNG files.

Use the Add new → Upload document menu in pdfFiller to import files from your device, cloud storage services, or a direct URL.

You can:

• Drag and drop files into the upload window or on your dashboard.
• Select files from your device.
• Import other files from cloud storage.

See more details on managing your files from cloud storage in our guide. pdfFiller supports PNG and JPEG image formats.

2. Select multiple images if needed

There are two ways to convert multiple PNGs:

1) Converting into one PDF:

Upload all the image files at once and select Merge and open.

After uploading multiple PNG files, pdfFiller lets users open each image separately or combine them into a single document using the Merge and open option.

2) Converting multiple images into separate PDF files:

Select the needed PNG images in your folder, and choose a bulk action for them: Save as → PDF.

You can convert PNG images to PDF in pdfFiller by selecting them in your My Documents folder and choosing Save as, then PDF among the output formats.

Here you will be prompted to manage pages and preview output files.

The settings window for PNG-to-PDF conversion in pdfFiller. Here you can manage pages, select the storage, and preview your files.

More settings of the Save as menu allow you to set export options, access, and permissions.

Set document export options, access, and permissions in the Save as menu of pdfFiller.

The separate PDF documents will be saved as a ZIP folder to the storage of your choice.

A fragment of pdfFiller’s interface showcasing the final step of downloading converted PNG images as separate PDF files.

This is useful when you need to merge PNG files to PDF for reports, design drafts, or documentation sets.

3. Arrange the page order

When combining PNGs into one PDF, you will be prompted to rearrange pages as the merged file opens in the editor.

The Rearrange Pages tool in pdfFiller lets users organize uploaded images by dragging thumbnails, rotating pages, deleting unwanted ones, or duplicating pages before saving the document.

Drag and drop thumbnails to set the correct sequence.

4. Set page layout and orientation

In the same Rearrange Pages window, you can rotate the images to adjust orientation or copy any of them.

Proper orientation is important for printing and presentation.

5. Convert and download

Click Done to complete the conversion of your merged document. The system will generate a new PDF in your account.

The Done button in pdfFiller’s editor applies all modifications to the document and takes you to the account dashboard.

From there, you can download the PDF or reopen it in the editor for further modifications:

• Add a watermark.
• Sign and send for eSignature.
• Create a link for others to share the PDF, and more.

Your files are stored securely in your encrypted account and can be automatically deleted if you remove them from storage. You can convert files on your phone with pdfFiller just as easily.

To convert a PDF to PNG, follow the simple steps described in one of our previous articles.

How to preserve image quality during conversion?

Does PNG to PDF reduce quality?

Your actions to avoid quality loss during the conversion are simple and logical:

• Upload full-resolution PNG image files.
• Review output before download.

How to balance file size and quality?

Large PNG files result in larger PDF files. If you need a smaller file size for sharing or retention, consider moderate compression. Learn more about compressing PDFs without losing quality from one of our previous articles.

Best practices:

• Keep original files for archiving.
• Use optimized versions for sharing.
• Test the PDF on different devices.

What about transparency?

PNG supports transparency. When converting with pdfFiller, transparent areas render as a white background in the final PDF.

If your design relies on transparency, review the new PDF before distribution.

Use cases

Common use cases for converting PNG images to PDF include design, front-end development, and documentation. The full list of industry-based use cases is much broader. Here we just give some examples answering frequent questions:

How do designers use the conversion?

Design teams often export mockups, wireframes, and UI mockups as PNG files. Converting them to one PDF helps:

• Share organized drafts with clients.
• Collect comments in a single PDF document.
• Maintain version control.

How do web teams use this type of conversion?

For example, web professionals capture screenshots of pages or app flows. By converting multiple PNG images into one PDF, they create structured reports for stakeholders.

The conversion is useful for:

• QA documentation.
• Bug reports.
• Product reviews.

How do businesses use PNG to PDF?

Businesses convert logos, branding materials, and marketing assets to PDF format for:

• Print-ready materials.
• Contract attachments.
• Proposal appendices.

How is the PNG-to-PDF type of conversion used in documentation?

Technical teams and document management professionals may convert diagrams, flowcharts, and system maps into one PDF file for consistent sharing and easier archiving.

This was a brief overview of a single feature: image-to-PDF conversion. To explore more tailored solutions for industries such as finance, healthcare, and insurance, visit our dedicated pages.

Conclusion

For clear text, clean diagrams, and transparent backgrounds, PNG is the perfect choice. Converting PNGs to PDFs offers several benefits: you can merge multiple images into a single file, improve compatibility across various platforms, and create a professional document that is simple to share and archive.

pdfFiller streamlines the conversion process, seamlessly integrating it into your document workflow.

Start your free trial today to upload, arrange, combine, and download a secure PDF from any device.

Glossary

PNG (Portable Network Graphics): A lossless image format that preserves quality and supports transparency.

PDF (Portable Document Format): A fixed-layout document format that preserves appearance across devices and operating systems.

Lossless compression: A method that reduces file size without removing image data.

Lossy compression: A method that reduces file size by discarding some data, which may reduce quality.