How to Convert a PDF to an Image
Converting a PDF page into a PNG, JPG or WEBP file is a common need: slides want images, issue trackers preview them properly, and some printers simply refuse anything else. This guide covers the whole process and the problems people most often run into.
Why convert a PDF at all?
A PDF is a description of a page rather than a picture of one. It stores text as characters, vectors as curves, and fonts as embedded programs, and it expects the viewer to draw all of that on demand. That is exactly what makes PDFs sharp at any zoom level, but it also makes them awkward to embed. Paste a PDF into a presentation and you are at the mercy of whatever renderer that application happens to use.
An image has no such ambiguity. Once a page has been rasterised, every viewer shows the same pixels. That predictability is the real reason most people convert: not because images are better, but because they travel better.
The conversion, step by step
Start by opening the converter and waiting a moment for the rendering engine to load. On the first visit the browser downloads a WebAssembly module of a few megabytes; after that it is cached. When the upload area appears instead of the spinner, the tool is ready.
Select your PDF by dragging it onto the upload area or clicking to browse. The first pages are rendered as thumbnails so you can confirm the document is the one you meant. Nothing has been uploaded at this point, and nothing will be.
Now choose your settings. Pick an output format, set the scale that matches your intended use, and adjust image quality if you selected JPG or WEBP. Press Convert to image and the tool renders each page in turn, packs them into a ZIP archive, and hands that archive to your browser as a download.
Inside the archive each file is named after the original document with the page number appended, so page order survives extraction regardless of how your operating system sorts files.
When the output looks blurry
Blurriness is almost always a scale problem. A PDF page is measured in points, and one point is 1/72 inch, so rendering at scale 1x gives you roughly 72 pixels per inch. That is fine for a thumbnail and far too coarse for anything you intend to look at closely.
Raise the scale and the problem disappears. Scale 2x lands around 144 DPI, which is comfortable on screen; 4x gets you close to 288 DPI, which is reasonable for printing body text. If you are exporting a page that is mostly small print or fine line art, going higher still is worth it.
One caveat: scale multiplies both width and height, so the pixel count grows with the square. Going from 2x to 4x does not double the output size, it roughly quadruples it. Pick the lowest scale that actually looks right rather than reaching straight for 10x.
When the archive is too large
If your ZIP came out unexpectedly large, the cause is usually PNG at a high scale. PNG is lossless, so a 300 DPI page of dense text can run to several megabytes on its own, and a hundred-page document adds up quickly.
Switching to JPG or WEBP at a quality of around 0.85 typically cuts the total dramatically with no visible difference, and WEBP usually wins over JPG at the same quality. Lowering the scale by one step is the other lever, and it is often the more effective of the two.
Raising the ZIP compression slider, by contrast, will not help much. PNG, JPG and WEBP are all compressed formats already, so there is very little redundancy left for deflate to remove. You mostly pay in processing time.
Large documents and browser memory
Because everything happens in your browser, the practical limit is your own available memory rather than an upload cap. Each page is rendered into a full-size bitmap before it is encoded, so a very long document at a very high scale can exhaust what the browser is willing to allocate.
If a large file stalls or the tab becomes unresponsive, reduce the scale first, and consider splitting the PDF into smaller chunks before converting. Closing other heavy tabs frees up headroom too.
In short
Pick PNG for text you want pixel-perfect and JPG or WEBP when size matters, set the scale from the DPI you actually need rather than from the maximum available, and leave ZIP compression alone. That covers the overwhelming majority of conversions.