Your files stay on your device

File processing runs in your browser. Documents are not uploaded to our servers. The site may download processing engines and send usage or feedback events without file contents.

How we handle your data →
← All PDF tools

PNG to PDF

Collect PNG diagrams into one PDF with the same sequence as the source files.

Synthetic example — review the operation settings before running.

Your documents stay on this device. Tool downloads and usage statistics do not include file contents.

Local limits: Max total size: 40 MB

Files are processed in your browser. They are not uploaded to this site.

A practical guide

Keep diagrams in their source order.

  1. Choose the PNG diagrams and confirm their order.
  2. Select a page size and margins; retain original preparation for transparent backgrounds.
  3. Create the PDF and compare each output page with its source image.

Try this example

Select a system overview followed by two detail diagrams. Create a three-page PDF and check that transparent layers and labels are visible in the viewer.

Before

  • PNG 1
  • PNG 2

After · one PDF

  • 2-page PDF
Input and expected output for this task. Illustrative example.

Before you start: The PDF contains image pages; diagram labels are not selectable text.

Number the image PDF
What you get

Convert PNG images to one PDF. Original mode preserves image transparency; JPEG preparation fills transparent areas white.

Limits and important details

Original mode: 40 images, 40 MiB input, 16 MP per image / 40 MP total; no EXIF correction. Optional preparation: 10 images, 10 MiB each, 40 MiB total, 12 MP per image / 24 MP total before decode, 40 MiB output. Preparation applies browser EXIF orientation and downsizes without upscaling. JPEG is lossy and fills transparency white; PNG preserves transparency. Image size uses prepared dimensions as PDF points. No HEIC or OCR; limits are not a total memory guarantee.

Example

Choose two PNG images and keep original preparation. Create a two-page PDF and inspect transparent areas against the PDF viewer background. JPEG preparation fills transparency white.