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Combine PNG images of diagrams or interfaces into a PDF to send for feedback.
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Merge PNG images into a PDF file. Process up to 20 files totaling no more than 256 MB. No registration required.
Technical content edited by Tools.4PDF.Net • Updated September 8, 2026Up to 20 files · up to 256 MB
Files are protected and deleted automaticallyGuide
Three steps from the source document to the result you need.
Select the right task for your document.
Drop files or select them directly from your device.
Track progress and download your file when it is ready.
No account, no installation and no unnecessary steps.
Only this session can access your files.
Input files and results expire after one hour.
Learn about this tool
To convert PNG to PDF, you can combine up to 20 images in the arranged order. PNG usually retains text and graphics sharper than JPEG, suitable for document scans, diagrams, or images with a transparent background. When put into PDF, the transparent background will be flattened.
The total size for each process is 256 MB and this page does not accept JPEG. The alpha layer of PNG is not preserved in PDF, so transparent areas usually display according to the page background. If the images have very different sizes, you should open the PDF to check it.
Combine PNG images of diagrams or interfaces into a PDF to send for feedback.
Create PDF from PNG of text pages when you prioritize sharpness over file size.
Arrange PNGs in presentation order and then export a file for the recipient to flip through.
Practical tips
Each job uses a separate anonymous session. Learn how we handle data in our Privacy and Security.
Frequently asked questions
No. Images are placed on PDF pages, so the alpha layer is not retained, and transparent areas usually appear with a white background or the page background. If a specific background color is needed, you should merge the background into the PNG first.
PNG retains more details and loses less data from compression than JPEG. Many high-resolution images can easily exceed the expected file size. You can reduce the PNG size beforehand or compress the PDF after creation.
Maximum 20 files and a total of 256 MB. If you exceed the limit, split into multiple batches or reduce the source resolution.
Access expires after one hour and cleanup runs every five minutes. Download any results you need before they expire.