PNG to PDF
Convert PNG images to one PDF, one page per image. Ordinary opaque PNGs are placed unchanged, and transparent ones keep their transparency unless you choose white.
Tool workspace
Nothing is uploaded. Files are read in this tab and stay on your machine.
Convert PNG images to PDF
Save your download before you leave the page — it exists only in this tab.
How do I convert PNG images to PDF?
Select up to 500 PNG files, each up to 64 MiB. One page is produced per image, in the order listed.
Decide whether to keep transparency or put transparent areas on white, then choose the page sizing.
Select Create PDF and save the result before leaving the page.
How does PNG to PDF handle transparency?
Convert PNG images to PDF, combining screenshots, diagrams or artwork into one PDF with a page per image. An ordinary opaque PNG is placed with its original compressed data untouched, and a transparent one keeps its transparency unless you choose a white background.
An ordinary PNG without transparency stores its compressed rows in exactly the form a PDF uses, so they are copied across unchanged and the PDF is told how to unpack them. Opaque palette images keep their palette rather than being expanded to full colour. A PNG with transparency, or one saved as interlaced (built up in several passes), cannot be copied that way, so your browser decodes it and it is rebuilt, with its transparency kept as a separate layer the page shows through unless you choose a white background.
How Xenmark makes it easy to convert PNG images to PDF
Opaque PNGs go in without a re-encode
A non-interlaced PNG without transparency keeps its compressed rows exactly as saved, so lines and text come out pixel for pixel unchanged.
Nothing leaves your machine
Nothing is uploaded. Files are read in this tab and processed in memory, with no account and no server for them to go to.
Transparency kept, or flattened onto white
Keep transparency and it stays see-through on the page. Turn it off and those areas are filled with white, never with black.
Palette images stay indexed
An opaque palette PNG keeps its palette instead of being expanded to full colour, which keeps the PDF small.
Page size from the PNG's own resolution
When a PNG records its resolution in pixels per metre, the page takes that physical size. Without one, the density you enter is assumed and reported.
Nothing to install
It runs in the browser you already have. There is no plug-in, no desktop application and no sign-up to get through first.
Limitations
What this tool does not do, stated up front.
Interlaced and transparent PNGs, and 16-bit PNGs that must be decoded, are rebuilt at 8 bits per channel by your browser, so fine tonal steps in 16-bit images can be lost.
A colour profile or gamma setting in an opaque PNG that is placed untouched is not carried into the PDF, so its colours can look slightly different.
Each PNG can be up to 64 MiB, and up to 500 go into one PDF. A PNG your browser has to decode is limited to 40 million pixels.
Questions
What happens to transparent areas?
By default they stay transparent and the page shows through. Untick Keep transparency and they are placed on white instead. They are never left black.
Is my PNG recompressed when it is converted to PDF?
An ordinary opaque PNG is not; its compressed data is placed unchanged. One with transparency or interlacing has to be decoded and rebuilt, and the result tells you which.
Do palette colours survive?
Yes, for an opaque, non-interlaced palette PNG: its palette is carried across, which keeps the file small. A palette PNG with transparency or interlacing is decoded and stored as full colour.
Why did Xenmark build a free PNG-to-PDF converter?
Xenmark AS is a Norwegian software company building browser-based drawing review tools for owners, consultants, operators and other teams that receive and review technical drawings. Those teams handle PDFs every day, and not every file should be sent to a website just to merge, split or check it — a tender document, a client’s drawing set, a revision that is not released yet. So these everyday tools are free and run entirely in your browser: no account, no upload step, and no server ever receives the file. You can check that yourself — open your browser’s network tab, place a PNG on a page, and watch nothing leave. What this tool cannot do is listed under Limitations above.
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