Screenshots and diagrams are the documents of the screen; a PDF is what other people can file.
Screenshots are today's paperwork
A bug report is a stack of screenshots, a dashboard export is a chart saved as an image, an
invoice from a web shop is a picture in a folder. Ten of them in a chat thread vanish;
the same ten as a PDF become a report with numbered pages that a support desk, an
accountant or a client can read in the intended order.
Transparency is kept
A PNG can carry an alpha channel, and this is the format's real advantage for diagrams: a
chart or an icon exported on a transparent background keeps that transparency inside the
PDF. Nothing is flattened onto black, nothing picks up a coloured box — on a page the
transparent parts simply show the white of the sheet, so the diagram sits on the paper
instead of in a rectangle.
Hairlines and small labels survive
A PNG with transparency is embedded without a lossy step, so the anti-aliased edge of a
diagram stays exactly as it was exported. A flat picture is written once at high quality:
thin grid lines, arrows and a 9 pt axis label come through cleanly, because a screenshot
is not asked to survive the heavy compression a web photo gets.
How the pages are ordered
A screenshot walkthrough only makes sense in sequence, so the list is the document.
The first row is page 1
Files are appended in the order you add them, so the screenshot of step one goes in first.
Every row shows a thumbnail, the file name and the size, so a wrong picture can be spotted
without opening the PDF afterwards.
Up and down buttons, no dragging
Each row ends with ↑, ↓ and ×. The arrows
swap it with its neighbour — the page numbers shift with it — and the cross removes it.
Dragging a row is not supported: a drag is treated as a new batch of files and appends them,
so the buttons are the one way to move a page, and they work with a keyboard too.
Add in as many passes as you like
Take the screenshots one at a time and drop them in, or paste them straight from the
clipboard with Ctrl+V (Cmd+V on a Mac) — each paste adds to the end of the list.
Add more reopens the picker. The list stops at 30 images.
Page size, orientation and margin
Wide screenshots and tall diagrams rarely share a shape, so the paper can follow each one.
A4
210 × 297 mm, the default and the safest choice for something that will be printed or filed.
The picture is scaled down until it fits inside the printable area, keeps its proportions
and is centred. A desktop screenshot gets a landscape page and very little wasted space;
a tall diagram gets a portrait one.
US Letter
216 × 279 mm, the same idea for printers in the United States and Canada. Slightly wider
and shorter than A4, with the picture fitted and centred the same way. Pick the paper the
document will actually be printed on rather than converting it twice.
Fit to image
The page becomes the screenshot or diagram itself, with no paper around it. For a single
chart that will be dropped into a wiki, a slide or another PDF, this is the mode that keeps
the picture at its own proportions with nothing to trim afterwards — and with the margin at
0 the page measures the image exactly.
Orientation and the margin
Automatic turns every page to match its own picture, which is usually what a mixed set of
screenshots needs. Portrait or landscape forces one shape across the whole document. The
margin is in millimetres and defaults to 10 mm on A4 and Letter — room for a printer — and
can go down to 0.
Limits and what happens to the pixels
Generous for a full walkthrough, precise about what is and is not resized.
30 images, 25 MB each, 100 MB together
Screenshots are small, so the 30-image cap is usually what stops a list first; a diagram
exported at print resolution can be the one hit by the 25 MB per-file limit. Both are
checked as you add: the offending file is named and skipped and the rest stay, and passing
100 MB in total stops the intake with a message.
Nothing is upscaled
A screenshot taken at 800 px keeps its 800 px — no pixels are invented to make it bigger.
On an A4 or Letter page a small picture is allowed to grow to 1.5× its natural size so it
does not drown in the margin; past that it is placed as it is, and the page stays honest
about the detail that was there.
Capped at 4000 px on the longest side
A 5K or retina screenshot is scaled down to 4000 px before it becomes a page. Across the
printable width of A4 that is still more than 500 dpi, so labels stay readable in print,
while a twenty-page document does not turn into a 200 MB file.
Sharp where it matters
A PNG with transparency keeps its alpha channel in the PDF and goes in without a lossy
round trip, so edges and thin lines survive untouched. A flat picture is written once at
high quality instead, which keeps the document small and looks the same at reading size.
Nothing is cropped and nothing is stretched — an odd aspect ratio leaves bands of empty
page rather than a distorted picture.
How to convert PNG to PDF
Three steps, no account and nothing to install.
Add the PNGs
Drop them onto the box, click it to browse, or paste a screenshot with Ctrl+V (Cmd+V on a
Mac) — the clipboard route is the fastest for a walkthrough taken window by window. Each
file is checked against the limits as it arrives.
Order the pages and choose the paper
Move a row with ↑ and ↓, remove one with
×, then pick A4, US Letter or fit to image. Automatic orientation gives
each wide screenshot a wide page; set a margin in millimetres if the document will be
printed, or 0 to fill the sheet.
Create the PDF
The result card reports how many pages came out and how heavy the file is, next to the
combined size of what went in. One click downloads the document, with the transparency and
the sharp edges intact.
Three tips before you convert
Screenshots are cheap to retake; a murky document is not.
Capture large, then let the cap decide
Take screenshots at the highest resolution the screen offers, or on a retina display at 2×.
Small text in a 1000 px wide capture turns to mush on paper, while anything up to 4000 px
on the longest side is used at full detail — the converter only scales down, never up.
Crop the bits nobody needs
A full-window screenshot drags in the browser tabs, a bookmark bar and the operating
system's clock. Cropping to the window or the panel first puts more of the page into the
printable area, which is exactly what makes a PDF walkthrough readable at arm's length.
Pick the format that fits the job
A diagram that has to stay editable wants paths rather than pixels:
PNG to SVG traces it, and SVG to PDF then puts the artwork on
a page as real curves. A logo that has to work in print is better traced than placed at
400 dpi, while a screenshot is always a picture and belongs here.
Frequently asked questions
Is this PNG to PDF converter free?
Yes. No account, no payment, no watermark and no limit on how many documents you produce. A short rate limit is the only restriction, and it keeps the service usable for everybody instead of letting one visitor occupy it.
Does the transparent background survive in the PDF?
Yes. A PNG with an alpha channel is embedded with that transparency, so a diagram exported on a transparent background keeps it: nothing is flattened onto black or onto a coloured rectangle, and the transparent parts show the white of the page when the PDF is printed or viewed. A picture that already has a white background simply looks as it did.
What are the limits?
Up to 30 images in one PDF, 25 MB per image and 100 MB in total for the request. The limits are checked while you add files: one that is too heavy is named and skipped while the others stay in the list, and passing 30 images or 100 MB stops the intake and tells you which limit was hit.
Can I search the text in the screenshots?
No. Each page is the picture itself, so the PDF is an image container and nothing more: the words in a screenshot cannot be selected, copied or found with the search box, because there is no text layer under the picture. Getting real text out of a screenshot needs optical character recognition, which this tool does not perform.
What happens to my files?
Files are processed on our server and not stored. The PNGs are decoded, placed on the pages and returned as a single PDF; the download is the only copy that leaves the conversion, and no account is tied to it.