Convert PNG to PDF

When is PNG to PDF the right conversion?

It is the right choice for screenshots, UI mockups, charts, scanned line art and exported slides that must stay sharp. Bundling them into a PDF is handy for bug reports with step-by-step screenshots, design reviews, tutorial handouts, or submitting a set of diagrams as a single attachment.

A single PDF is also easier to review than a folder of files named Screenshot 2026-05-02 at 14.31.07.png. The pages stay in the order you set, reviewers can comment on them in any PDF reader, and the file can be archived with a project's documentation. Sort A–Z orders screenshots by their time-stamped names in one tap.

Why does PNG stay sharper than JPG in a PDF?

PNG is lossless, so every pixel is stored exactly, while JPG discards fine detail around sharp edges. The PNG format uses DEFLATE compression, the same lossless method PDF supports natively as Flate, which means a PNG can move into a PDF with no change to its pixels.

That matters most for small text. A 12-pixel font in a JPG screenshot picks up grey halos and blocky artefacts, which get worse each time the image is re-saved. In a PNG-based PDF the same text looks identical to the original screen at 100 percent zoom, and stays clean when printed.

Which page layout should you pick for screenshots?

Pick Fit to image for reading on screen and A4 or US Letter for printing. Fit to image produces pages that match each screenshot, so a tall mobile capture becomes a tall page and a wide desktop capture becomes a wide one. The long side is capped at 297 mm without dropping pixels, so zooming in still shows full detail.

For printing or a consistent look, choose A4 or US Letter. Auto orientation turns landscape screenshots sideways on the page instead of shrinking them, and a small 10 mm margin keeps content clear of printer edges. Images are scaled to fit and centred, never stretched or cropped.

What happens to the files during conversion?

They are processed entirely in the browser tab and never uploaded. Each file's real format is detected from its first bytes, PNG data is embedded without lossy recompression, and the pages are laid out by a background worker. WebP and HEIC files in the same batch are decoded locally first.

Screenshots often capture more than intended, such as email addresses in a sidebar, account numbers or open chat windows. Crop them in the screenshot tool before adding them, because the PDF shows every pixel of the original image. If something sensitive is noticed only after creating the file, Redact PDF can black it out permanently.

What are the limits of PNG to PDF?

Each image can be up to 50 MB, and the text inside images is not selectable until OCR is run. The number of images is limited only by the memory of the device, so very large batches are best done on a computer rather than an older phone. A few other details are worth knowing:

• Extremely large canvases above about 16 megapixels are reduced when they need re-encoding.
• Images are placed as pictures, so text in a screenshot isn't selectable. Run OCR PDF afterwards to add a searchable text layer.
• Sort A–Z compares numbers in file names naturally, so image-2 comes before image-10.
• To go the other way, PDF to PNG exports each page as a PNG.