What you get
One image per page, at a resolution you choose, saved straight to your machine. Single pages save on their own. More than one comes back as a zip.
The images appear on the page as soon as they are made, so you can see what you have before saving anything. If a page came out wrong, or the resolution was not what you expected, you change the setting and run it again without starting over.
How this tool works
Each page is drawn onto a canvas at the resolution you choose and encoded as an image. The canvas is painted white first, which sounds trivial and is not: a PDF page has no background of its own, and a transparent canvas encodes to JPEG as solid black, so every page would come out a black rectangle.
Pages are drawn one at a time and the canvas is released before the next, because forty A4 pages at 300dpi held at once is about a gigabyte of pixels and will simply fail on a phone.
Resolution is the only setting that matters
A PDF page has no pixels in it. It is a set of instructions, measured in points at 72 to the inch, and it stays sharp at any size because the shapes are drawn fresh every time. An image does have pixels, a fixed number of them, so turning a page into an image means deciding how many. That is what dpi means: dots per inch.
An A4 page is 8.27 inches wide. At 72 dpi that is 595 pixels across, which is fine on a screen and soft on paper. At 150 it is 1,240. At 300 it is 2,480, which is proper print quality. At 600 it is 4,960 across and nearly 25 million pixels for one page.
Doubling the dpi quadruples the pixels, so it quadruples the time and roughly quadruples the file size. This is why people pick the highest option, wait several minutes, and end up with a folder they cannot attach to anything. The tool shows you the actual pixel size for your document before you commit to it, so the decision is an informed one.
JPG or PNG
JPG for anything photographic, including scans. It throws away detail your eye does not miss and the files are a fraction of the size.
PNG for pages that are mostly text, line drawings or diagrams. It is lossless, so there is no blocky fringing around the edges of letters, and the files are several times bigger for it. If you are putting a page in front of a client, or the page is a drawing that somebody will measure off, use PNG.
The quality slider only applies to JPG. Around 85 is the point where you stop being able to see the difference. Below about 70 you start seeing blocks around text, and that is exactly where most free converters leave their default.
Greyscale is not just a look
A scan of a black and white document still carries three colour channels, and all the noise and paper tint that came off the scanner glass with it. Throwing the colour away often takes a third off the file size and can make the text easier to read.
It uses proper perceptual weighting rather than a flat average of the three channels, so a red stamp does not come out the same shade of grey as the text next to it.
What this cannot do
An image is not a document. Once a page is a picture, the text on it is no longer text: it cannot be searched, selected, copied or read out by a screen reader, and it never comes back. Every PDF to image tool does this, and most do not mention it.
So this is the wrong tool if what you wanted was the words. It is the right tool when you need the page as a picture: to put in a slide, to attach where a PDF is not accepted, to post, or to send to somebody who cannot open a PDF at all.
Contracts, payslips, medical letters, tender returns
Every other free converter works by sending your document to a server. Contracts, payslips, medical letters, tender returns. All of it, to a machine you know nothing about, held under a retention policy you have to take on trust.
This runs entirely in your browser. The engine that draws the pages is downloaded to your machine the first time you use it, and your document goes nowhere at all. You do not have to believe that either. Open your network tab and watch while it works.
Common questions
Is my PDF uploaded anywhere?
No. Every page is drawn on your own machine and the images never leave it. That is also why there is a progress bar: your computer is doing the work rather than a server somewhere, so a long document takes a moment rather than being instant.
How many pages can it do?
There is no limit set anywhere in the tool. The practical limit is your own machine and your patience, because each page is drawn one at a time. A few hundred pages at Good is fine. A few hundred at Archive will take a while and produce a very large zip.
What resolution should I pick?
Good, at 150 dpi, unless you know you need otherwise. Screen is for putting a page in an email or on a slide. Print is for anything going to a printer. Archive is for reading small print or scaling a drawing up, and it produces files roughly sixteen times the size of Screen.
Why is the text on my image not selectable?
Because it is a picture now. Every one of these tools works the same way: turning a page into an image flattens everything on it into coloured dots, and the text stops being text. If what you actually wanted was the words, use PDF to text instead, which lifts them out properly.
Why one zip instead of separate downloads?
Because a browser blocks most of forty download prompts and asks permission for the rest. Single pages save on their own from the Save button under each one. Anything more than one is offered as a zip, which is stored rather than compressed, since JPEGs are already compressed and squeezing them again achieves nothing.
Is there a watermark?
No. Nothing is added to your images, no logo, no corner stamp, no reduced resolution to make you pay for the full one. What you set is what you get.