PDF to JPG Converter

DPI, and the pixel dimensions you actually get

A PDF page has no pixels. It is described in points, where one point is a seventy-second of an inch, and the resolution only exists at the moment something draws it. The DPI setting here decides how many pixels get drawn per inch of page.

A4 measures 595 by 842 points, so the arithmetic is straightforward:

• 72 DPI gives roughly 595 by 842 pixels. Fine for a thumbnail or a forum post.
• 150 DPI gives roughly 1240 by 1754 pixels. This is the sensible default for screens, slide decks and email attachments.
• 300 DPI gives roughly 2480 by 3508 pixels. Use it when the image will be printed at full size, or when small type has to stay readable after zooming.

US Letter, at 612 by 792 points, works out at 1275 by 1650 pixels at 150 DPI and 2550 by 3300 at 300. A page of any other size scales the same way.

Each image is encoded as JPEG at quality 0.92, which is high enough that compression artefacts around small black text are hard to spot but keeps files well below what a lossless format would produce. A text-heavy A4 page at 150 DPI typically lands somewhere around 150 to 400 KB.

What you give up by turning a page into a picture

This is the important trade-off and it is not reversible. A PDF page holds text as characters plus a font. A JPG holds a grid of coloured dots. Once converted, you cannot select a sentence, you cannot search for a phrase, a screen reader has nothing to announce, and copy and paste gives you nothing.

Line art suffers too. A logo that was stored as vectors and stayed crisp at 800 percent zoom becomes a fixed grid of pixels that softens the moment you enlarge it beyond the DPI you chose.

There are good reasons to accept that. Images embed anywhere: a slide, a web page, a chat message, a listing that only takes photos. They also render identically everywhere, which a PDF does not always do when the recipient's reader substitutes a missing font. But if what you actually want is the words out of the document, PDF to Word will serve you far better than a picture of them.

One more detail: every page is painted onto a white background before rendering. Any transparency in the original becomes solid white, and JPEG has no alpha channel to preserve it anyway.

How the page range and the downloads behave

Leave the range box empty and every page is converted. Type 1-3,5 and you get four images. Reversed ranges such as 8-6 are read backwards and accepted. Anything that is not a number, a comma or a hyphen is rejected rather than interpreted, as is any number outside the document's page count.

Changing either the DPI or the range re-renders the whole set from scratch, so switch to 300 DPI before you start downloading rather than after.

Each thumbnail has its own download button that saves that single page immediately. The main button packages everything into one ZIP, with file names zero-padded to match the highest page number, so a 120 page document produces report-page-007.jpg rather than report-page-7.jpg and your file manager sorts them correctly. If your range came out to exactly one page, that button skips the ZIP and simply hands you the JPG.

Memory, and where a phone gives up

Rendering is the expensive part. A canvas holds four bytes per pixel, so one A4 page at 300 DPI occupies about 35 MB while it is being drawn, and each finished image is then kept in memory so you can download it later.

On a desktop that is unremarkable. On a phone, a 60 page document at 300 DPI is a reliable way to make the browser discard the tab halfway through. If you are on a mobile device and the page reloads itself, drop to 150 DPI, or convert in batches by typing 1-20, then 21-40, and so on.

Encrypted files are refused when you open them, with a message explaining why. Remove the password in the application that produced the file, then come back.

Everything runs in your browser, so your files never leave your device.

After the conversion

If the JPGs are larger than a form or a website will accept, Compress Image to KB lets you aim at a specific size such as 200 KB. If you only wanted the photographs that were placed inside the document rather than pictures of the whole page, Extract Images from PDF is the right tool. And if you convert a document and later want it back as a PDF, Images to PDF will reassemble the pages, though the text will stay flattened.

Questions

Why is my JPG blurry when I zoom in?

Because it holds a fixed number of pixels. Zooming past the resolution you chose enlarges those pixels rather than revealing detail. Re-convert at 300 DPI if you need to inspect fine print.

Can I get PNG instead?

Not from this page, which always writes JPEG. For a lossless copy of a page, the fallback mode in Extract Images from PDF produces PNG, or you can convert a saved JPG with an image converter.

Does a scanned PDF convert well?

Yes, and often better than you expect, because a scanned page was already an image. Matching the DPI to the original scan, commonly 200 or 300, avoids resampling a picture that is already at its natural resolution.

Why did one page come out with missing fonts or odd spacing?

The renderer substitutes a font when a document does not embed the one it asks for. Line breaks and spacing can shift slightly as a result. Documents that embed their fonts, which most do, render exactly as intended.

How many pages can I convert at once?

There is no fixed cap. The practical limit is your device's memory, and a warning appears for files over 100 MB so you can decide whether to narrow the range first.