PNG → PDF

Convert PNG screenshots, diagrams and graphics to a PDF with lossless pages and transparency kept.

How to convert PNG to PDF

Add one or more PNG files.
Tick the images to include and put them in order with the arrows.
Rotate any image that is on its side.
Choose Match each image or Fit inside A4, and an orientation and margin for A4.
Press Create PDF and download the PDF.

Options

Order and selection: Tick an image to include it and use the up and down arrows to move it. Untick it to leave it out without closing the file.
Rotate: Turns one image 90° clockwise per click. The row shows the total turn before you create the PDF.
Page size: Match each image makes every page the size of its image, one pixel to one point, with no margin. Fit inside A4 puts every image on a 595 × 842 pt page: large images shrink to fit, smaller ones stay at their own size and are centred. Images are never cropped or enlarged.
Orientation: Shown with Fit inside A4. Portrait or Landscape applies to every page in the PDF.
Margin: Shown with Fit inside A4. None is 0 pt, Narrow is 18 pt (a quarter inch) and Standard is 36 pt (half an inch) on every side.
Page preview: Press Preview on a row to see the image drawn on its page with the current size and margin. A rotated PNG is shown as an outline of its placement rather than the picture itself.
Output PDF name: Up to 120 characters, without slashes or control characters. The .pdf extension is added. Left blank, one image keeps its own name and several become images.pdf.

What you get

One PDF with one page per ticked PNG, in the order shown.
Pixels are stored with lossless compression, so screenshots, text and thin lines stay sharp. Nothing is converted to JPEG.
Transparent areas stay transparent in the PDF. Most viewers show them as white; a print or layout workflow may show what is behind them.
The PDF can be larger or smaller than the PNG files, because the image data is compressed again for the PDF.

Limits

This page takes PNG files only. Use JPG to PDF for photos saved as JPEG.
Animated PNGs (APNG), interlaced PNGs and 16-bit PNGs are refused. Re-save them as standard 8-bit PNGs first.
An image larger than 16 megapixels on a computer or Android device, or 4 megapixels on iPhone, iPad and devices with 2 GB of memory or less, is scaled down to that size with its proportions kept. The review lists each image that will be scaled, and to what, before you press the button.
A scaled PNG stays a PNG, so transparency is kept. Its pixels are resampled, so very fine lines and small text can soften slightly.
Images above 64 megapixels on a computer or Android device, or 25 megapixels on iPhone, iPad and devices with 2 GB of memory or less, are refused before you start, and the disabled button names the file.
Scaling does not change the page size. With Match each image the page is still sized from the original pixel dimensions; only the embedded image has fewer pixels.
Text in a screenshot is part of the image. It is not selectable or searchable in the PDF.
With Match each image, a 1920 × 1080 screenshot becomes a 1920 × 1080 pt page, about 27 × 15 inches. Choose Fit inside A4 for a printable page.

Check the result

Deckle checks that the saved PDF opens, has one page per PNG and that each page has the planned size. Zoom in on small text and fine lines in the download, and check transparent areas in the viewer or printer you will use.

Questions

Is PNG to PDF lossless?

Yes, within the device limit. The pixels are kept exactly and stored with lossless compression, and no JPEG step is involved. A PNG over 16 megapixels on a computer, or 4 megapixels on iPhone and iPad, is scaled down first and then stored losslessly as PNG.

Does the PDF keep PNG transparency?

Yes. Transparency is stored as a mask in the PDF. A white background in your viewer does not mean it was lost; viewers paint white behind the page.

Why was my PNG refused?

It is animated, interlaced or 16 bits per channel, or larger than 64 megapixels (25 megapixels on iPhone and iPad). The message says which. Re-saving it as a standard 8-bit PNG fixes the first three; for the last, make a smaller copy first.

How do I put several screenshots on A4 pages?

Choose Fit inside A4, pick Portrait or Landscape, and set a margin. Each screenshot gets its own page and shrinks to fit if it is wider than the page.

Can I search the text in my screenshots afterwards?

Not directly. The PDF holds images, so the text needs an OCR tool to become searchable.

Do my files leave my computer?

No. The conversion runs in your browser and nothing is uploaded.