PNG to PDF
Convert PNG images to PDF with transparent areas composited onto white instead of black. Screenshots and diagrams stay crisp.
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About This Tool
PNG is the screenshot and diagram format. It is lossless, so text inside the image stays sharp rather than developing the fuzzy halos JPEG produces around high-contrast edges - which is exactly what you need when the image is a screenshot of a terminal or a UI.
The catch is the alpha channel. PDF pages have no transparency, so a naive conversion renders transparent regions as black and ruins a logo or a chart exported with no background. Here transparency is composited onto white first, giving you the result you expected.
Because PNG is lossless, the pixels are embedded without a quality-reducing re-encode. A screenshot converted to PDF is still pixel-exact.
How to Use
Add your PNGs
Drop in up to 100 files. Each becomes one page.
Arrange the pages
Drag the thumbnails into the order you want - useful for step-by-step screenshots.
Choose the page setup
Fit the page to the image for borderless output, or standardise on A4 or Letter for print.
Convert and download
Save the PDF with transparency flattened onto white.
Use Cases
Step-by-step documentation
Twenty numbered screenshots as one PDF walkthrough, with text in the images still legible.
Charts and diagrams
Exported charts with transparent backgrounds converted without the black boxes.
Design mock-ups for review
Lossless mock-up pages delivered as one document a client can annotate.
Frequently Asked Questions
Why do transparent PNGs sometimes turn black in other tools?
Because PDF has no alpha channel, so the transparent pixels have to be composited onto something. Tools that skip that step default to black. This one composites onto white.
Is any quality lost?
No. PNG is lossless and the data is embedded without re-encoding.
Will the text inside my screenshots be searchable?
No - it is pixels, not text. Run OCR on the resulting PDF if you need to search it.
Why are my PNG pages so large?
Lossless compression is bulky for photographic content. Run Compress PDF afterwards, or use JPG for photos.