How to Convert PNG to PDF (and Combine Multiple Into One File)

You have one or more PNG images and you need them as a PDF. Maybe screenshots that should travel as a single document. Maybe a scanned receipt or form that you photographed page by page. Maybe a set of design mockups bundled for email. PDFs are the lingua franca of “send this to someone” — they preserve order, work everywhere, and feel more like a “document” than a folder of loose images.

Here’s how to make the conversion clean.

The fastest way: convert in your browser

Use the PNG to PDF converter. Drop in your PNGs, arrange them in the order you want, click convert, save the resulting PDF.

The flow:

Open the PNG to PDF tool
Drag in your PNG files (one or many, you can drop them all at once)
Drag to reorder if needed — the order in the list is the order in the PDF
Click convert
Download the PDF

Each PNG becomes a single page in the PDF, sized to the image dimensions. A 1920×1080 PNG becomes a 1920×1080 PDF page. Multiple PNGs become multiple pages, in the order you arranged them.

When PNG to PDF is the right move

Sharing screenshots as a document. Bug reports, design feedback, instructions with screenshots — five PNGs feel like five attachments. The same content as a single PDF feels like a packaged document, and recipients can flip through pages without opening five files.

Building a document from individually-scanned pages. Old workflow: scan each page of a document with your phone, then… what? Lots of loose images. Convert them to a PDF and the document is one file again.

Sending mockups or design comps. Designers often share Photoshop or Figma exports as a folder of PNGs. Bundling them into a PDF gives the recipient a single file to comment on.

Combining photos with text annotations. If you’ve added text or arrows on top of screenshots with an annotation tool, the result is usually PNG. Bundle them into a PDF for sharing.

Creating an offline archive. A web page archived as PNGs (one per scroll) becomes a single readable PDF preserve. Better long-term storage than a folder of images.

Combining multiple PNGs into one PDF

This is the most common reason people use the tool. A few notes:

Page order matters. The PDF pages are created in the order the files appear in your input list. Drag to reorder them. Most tools sort uploaded files alphabetically by default — fine if your filenames are like 01.png, 02.png, 03.png; less fine if they’re screenshot_2026-05-15_at_3.47pm.png, screenshot_2026-05-15_at_3.49pm.png, etc.

Pages don’t have to be the same size. A PDF can have pages of mixed dimensions. If you mix a 1920×1080 screenshot with a 800×600 image, the PDF will have one wide page followed by one smaller page. Some PDF viewers handle this gracefully; some show the smaller page “centered in” what looks like a larger frame.

For consistent page sizes, resize your PNGs first. Use the Image Resizer to bring all your images to a common dimension before converting. Result: a PDF where every page is the same size.

What about JPG instead?

We have JPG to PDF for that. Same tool, same workflow, just for JPG input.

The choice between PNG and JPG inputs:

PNG: better quality (lossless), bigger files, best for screenshots and graphics
JPG: smaller files, slight quality loss, best for photos

The output PDF will contain whichever you put in — PNG inputs give larger PDFs with crisper images; JPG inputs give smaller PDFs with photo-style images. If file size matters and the content is photos, convert your inputs to JPG first.

How big will the resulting PDF be?

Approximately the sum of the input image sizes, plus a small PDF overhead.

10 screenshots at ~500 KB each = ~5 MB PDF
50 phone photos at ~3 MB each (PNG conversion) = ~150 MB PDF — pretty big

If the resulting PDF is too big to email or share, the fix isn’t to use a different conversion tool — it’s to compress the source images before converting.

Workflow for keeping the PDF small:

Run all PNGs through the Image Compressor first — typically 50-70% reduction with no visible quality loss
Convert the compressed PNGs to PDF
Result is a much smaller PDF without quality issues

Alternative: convert PNG to JPG (smaller files) before bundling. The PNG to JPG converter handles this. For photo-style images, JPGs are 3-5× smaller than PNGs at the same visual quality.

Combining a PDF with another PDF

If you’ve already got a PDF and want to add PNG pages to it, the workflow is:

Convert your PNGs to a PDF with PNG to PDF
Merge that PDF with your original using the PDF Merger

Two steps, ~30 seconds total. The PDF merger lets you reorder pages, so you can insert the PNG-derived pages anywhere in the document — beginning, end, or middle.

Transparency in PNG vs PDF

PNG supports transparency (the alpha channel). PDF technically does too, but most PDF viewers display transparent backgrounds as white. So if you convert a PNG with transparency, the transparent regions become white in the PDF.

This is usually fine — most PNGs that get converted to PDFs are screenshots or scans where transparency isn’t relevant. But if you’ve got, say, a logo on a transparent background, it’ll appear with a white background in the PDF (which is usually what you want for printing).

For PDFs where you want a colored background instead of white, you’d need to first composite the PNG over a colored canvas in an image editor, then convert. The PNG-to-PDF tool doesn’t handle this directly.

Privacy

The conversion runs in your browser using pdf-lib. Your PNG files are read with the browser’s File API, processed in memory, and the resulting PDF is generated as a browser blob you download.

Nothing uploads. No server sees your images. No “free” cloud-based PDF builder ever gets a copy of your files.

For PDFs from sensitive PNGs (private screenshots, scanned personal documents, internal mockups), this matters — the conversion is fully private.

TL;DR

One or many PNGs → one PDF → PNG to PDF
Drag to reorder pages before converting
Resize inputs first if you want consistent page sizes
Compress inputs first if you want a smaller output PDF
JPG input? Use JPG to PDF instead
Want to add PNG pages to an existing PDF? Convert to PDF first, then merge
Runs in your browser, no upload