PNG is what screenshots, diagrams, charts and logos are usually saved as. Turning them into a PDF makes them printable, attachable and viewable on any device without an image viewer — which is why documentation, reports and submissions want PDF rather than a folder of images.
Your images never leave your device. They are read by your browser, drawn onto a canvas and written into a PDF in memory. Nothing is uploaded and nothing is stored.
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Result
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What the PNG to PDF does
The important difference from JPG is transparency. PNG supports transparent backgrounds; PDF pages do not have a concept of transparency in the same way. Each image is therefore drawn onto a white background before being embedded, which is what a printed page would look like anyway.
PNG is a lossless format and the PDF embeds a JPEG re-encoding, so there is a quality trade-off. For screenshots of text at 92% quality it is invisible; for line art with hard edges you may prefer to raise the quality setting.
How to use this tool
- Select your PNG files, or drag them onto the upload area.
- Reorder them if the sequence matters — screenshots of a process usually do.
- Pick a page size. A4 for documents; "fit" if you want each page to match the image exactly.
- Raise the quality setting to 96–100% for screenshots with fine text or sharp line art.
- Press Create PDF and download.
How PNG images are handled
1. The PNG is drawn onto a canvas pre-filled with white.
→ transparent pixels become white
2. The canvas is encoded as JPEG at your chosen quality.
3. The JPEG is embedded and scaled to fit the page:
Scale = min(available width ÷ w, available height ÷ h)
Images wider or taller than 3000 pixels are reduced to that
limit first, which is about 250 DPI across a full A4 page.
Worked example
Example: a set of screenshots
| Input | 6 PNG screenshots, 1920 × 1080 |
| Page size | A4 landscape (matches the 16:9 shape) |
| Quality | 96% for readable text |
| Output | 6-page PDF, around 1.2 MB |
Landscape suits widescreen screenshots — on a portrait page the same image is scaled down to about half the width and the text becomes hard to read.
What your result means
Transparency is gone in the output, replaced with white. For a logo intended to sit on a coloured background, that is a real change worth checking.
Screenshots need higher quality than photographs. Text and sharp edges show JPEG artefacts that a photograph hides — use 96% or above.
Match orientation to content. Widescreen screenshots belong on landscape pages.
Important considerations
- For screenshots of text, capture at the highest resolution you can. Enlarging a small screenshot to fill an A4 page makes the text blurry however good the PDF settings are.
- PNG transparency is flattened to white. If you need transparency preserved, PDF is not the right container for that image.
- Diagrams exported as PNG lose their vector sharpness. Where the source can export PDF or SVG directly, that will look better at any zoom level.
- For a mix of PNG and JPG files, convert each type separately and combine with the merge tool.
- Very large PNG screenshots from high-resolution displays can be several megabytes each. The 3000-pixel cap keeps the PDF manageable.
Limitations of this tool
- Images larger than 3000 pixels on their longest side are scaled down to that size before embedding. This keeps memory use manageable on phones and rarely affects print quality, since 3000 pixels is roughly 250 DPI across a full A4 page.
- All images are re-encoded as JPEG inside the PDF. This is what allows PNG and WebP to be embedded reliably, but it means PNG transparency is flattened onto a white background and lossless PNG becomes lossy.
- Very large batches — more than about fifty photographs — can exhaust memory on a phone. Convert in smaller groups and merge the results.
- PNG transparency cannot be preserved — every image is flattened onto a white background.
- Lossless PNG becomes lossy JPEG inside the PDF. At high quality settings this is not visible, but it is not byte-identical to the source.
Frequently asked questions
What happens to transparent areas in my PNG?
They become white. PDF pages are opaque, so each image is drawn onto white before being embedded — the same as it would look printed.
Will my screenshots stay readable?
Yes, if the source is high resolution and you use a quality setting of 96% or above. Text is where JPEG compression shows most, so it is worth raising quality above the default for screenshots.
Should I use portrait or landscape?
Match the image. Widescreen screenshots look far better on landscape pages; document scans and phone screenshots suit portrait.
Can I mix PNG and JPG files?
Not in one pass — this tool accepts PNG. Convert each type with its own tool and combine the two PDFs with the merge tool.