What this does
Bundles PNG images into a single PDF, one image per page, in the order you
arrange them, and downloads it as images.pdf. PNG is what
screenshots, exported diagrams, whiteboard captures and design mock-ups
arrive as, and a PDF is the tidiest way to hand a sequence of them to
someone: a step-by-step bug report, an onboarding walkthrough, a set of
slides exported one image at a time. Everything happens in your browser
with pdf-lib; nothing is uploaded, so screenshots of internal dashboards
and customer data stay on your machine.
How do I convert PNG screenshots to a PDF?
- Choose the PNGs. The picker is limited to
.png; you can add more in later batches, up to 20. - Drag the rows into reading order. Screenshots are usually named by timestamp, so the initial order is often right, but check the index numbers.
- Choose a page size and press Create PDF.
What happens to transparent areas?
They become white. Each PNG is drawn onto a white canvas before it is embedded, so a logo or icon exported with a transparent background lands on a white page, and semi-transparent shadows are blended against white. For screenshots this changes nothing. If the transparency matters, the PDF is not the right container; keep the PNG.
Is the PDF pixel-perfect, like the PNG?
Not quite, and this is worth knowing. The image is re-encoded as JPEG at quality 0.92 before it goes into the document, so the PDF does not hold the PNG's lossless data. Screenshot text stays perfectly readable and the file is much smaller than embedding raw PNG would make it, but very fine one-pixel lines and flat colour fields can show faint JPEG ringing when zoomed far in. For a design review that hinges on exact pixels, share the PNGs; for reading and printing, the PDF is fine. Images over 8192 px on a side are clamped to that limit.
Which page size suits screenshots?
Fit each image, the default, gives every page exactly the screenshot's dimensions with no margin, at one PDF point per pixel. A 1920 × 1080 capture becomes a 26.7 × 15-inch landscape page, which viewers simply zoom to fit, and a tall scrolling capture becomes a tall page. Mixed sizes are fine. Choose A4 or US Letter when the PDF will be printed: each image is scaled to fit inside a 24-point margin and centred, and the sheet flips to landscape for wide captures. Small screenshots are enlarged to fill the page, so a tiny dialog box will look soft on paper.
Can I search the text in the screenshots?
No. There is no OCR, so an error message or a code listing in a screenshot is just pixels inside the PDF; nothing can be selected, copied or found with search. If the words matter, paste them as text alongside the images in whatever document or ticket the PDF is going into.
Are there limits, and where does the work happen?
Up to 20 images per PDF, 50 MB each, and the whole job runs on your device: the browser decodes the PNGs, pdf-lib writes the file in memory and the download starts. The only network request is for the pdf-lib code itself, served by this site on first use. For a larger set, build two PDFs and join them with the PDF merger; to go the other way and get pages back out as images, use PDF to PNG.