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Convert PNG to PDF on Windows: 3 Methods

Make a PDF from PNG images on Windows with Print to PDF, then compress if SharePoint rejects the file. Resize sources first for screen-only sharing.

By Petr Samokhin

After a review meeting you may have fourteen PNG screens in a folder. The client portal wants one PDF. One PDF beats a zip for page order and single-field uploads. Merging alone does not reduce Retina mockups. Cap width before print, or compress the PDF after.

When one PDF beats many PNG files

ScenarioWhy merge into PDF
SharePoint single fileOne upload
Print vendorFixed sequence
HR packetPage order locked
EmailOne attachment

Reverse workflows: PDF to images on Windows , PDF to PNG on Windows . For JPEG scans: JPG to PDF on Windows .

PNG alpha may flatten to white in print preview. Flatten in Figma when the background must be brand-colored.

Method 1: Combine PNG with Print to PDF

Best for: Building the PDF on Windows without extra installs.

  1. Sort PNG files in File Explorer by name (use page-01.png style names).
  2. Multi-select, right-click → Print.
  3. Choose Microsoft Print to PDF.
  4. Confirm one-up layout and page order in the print dialog.
  5. Save the merged PDF.

Fix orientation in Paint before print when phone scans are sideways. Photos can print selected images to the same printer when the layout fits.

Limitation: A folder of 3000 px mockups can produce a 30 MB PDF that SharePoint rejects.

Method 2: Resize sources before print

Best for: Screen review packets under email or portal caps.

Batch resize with FFmpeg, then print from the resized folder:

winget install --id Gyan.FFmpeg -e
mkdir resized
Get-ChildItem *.png | ForEach-Object {
 ffmpeg -i $_.Name -vf scale=1920:-2 "resized\$($_.BaseName).png"
}

For PNG to JPEG when transparency is gone: PNG to JPG on Windows . Windows does not ship a Preview-style Quartz “Reduce File Size” filter. Source resize plus Method 3 is the reliable path.

Limitation: You maintain the resize step yourself.

Method 3: Compress the PDF in GetCompress

Best for: Recurring submissions when the merged PDF still exceeds the portal limit.

GetCompress does not merge PNG into PDF. Print first, then:

GetCompress PDF settings for compressing a merged document on Windows
  1. Drop the merged PDF into GetCompress .
  2. Pick a PDF compression preset and preview a page with small type.
  3. Export a delivery copy.
  4. Save a preset per client portal when the same limit repeats.

PDF compression uses optimization presets, not an exact target file size.

Which method should you use

SituationStart here
Build the documentPrint to PDF
Sources are huge Retina PNGResize first, then print
Merged file still too largeGetCompress

More detail: how to compress PDF on Windows . Cap PNG width before merge: how to compress images on Windows .

Check before you upload

Confirm page order, orientation, and one UI screen with small type in Edge. Keep full-resolution PNG sources. Write compressed deliverables to a separate folder.

When Print to PDF alone is enough

Print to PDF with sensible source width is enough for many one-off packets.

GetCompress fits when you rebuild the same kind of PDF every week and portals keep rejecting size. It does not replace a PDF editor for forms, signatures, or redaction.

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