PDF to JPG: choosing the right resolution (DPI) for print, screen and documents
Converting a PDF page to a JPG turns the document into a picture. That sounds simple, and mechanically it is: each page is drawn onto a canvas and saved as a JPEG file. The subtle part is choosing the settings, because they decide whether the image looks like a sharp page or a blurry scan.
This guide covers the two controls that matter most — resolution and quality — and helps you decide when a page image is genuinely the right output versus when another format would serve you better.
How the conversion works
The converter draws every page of the PDF onto a pixel canvas and encodes it as a JPEG. Text and vector graphics are rasterised: they become coloured pixels at a fixed resolution. The canvas size is derived from the PDF page size in points, multiplied by the chosen DPI (dots per inch) setting.
Higher DPI means more pixels, which means a sharper image and a larger file. At 72 DPI a letter-size page becomes roughly 612 by 792 pixels — fine for a quick preview, too coarse for print or close inspection. At 300 DPI the same page is about 2550 by 3300 pixels, suitable for most print uses.
Choosing the right resolution
| Use case | Suggested DPI | Note |
|---|---|---|
| Email or chat sharing | 72–96 | Small file, readable on screen |
| Web upload or slides | 144 | Good balance of size and clarity |
| Documentation and archiving | 200 | Text stays crisp when zoomed |
| 300 | Standard print resolution |
There is no reason to use higher DPI than your destination needs. A 600 DPI export of a long document produces huge files that most viewers will never display at full zoom. Pick the resolution that matches where the image will actually be used.
Understanding JPEG quality
JPEG is a lossy format: it discards detail to shrink file size. Quality settings on this tool control how aggressively that happens. High quality (90+) keeps text edges clean and photos crisp but produces larger files. Medium quality noticeably reduces file size; text remains readable but fine details soften.
For pages with small text, prefer high quality. For photographic pages, medium quality is often indistinguishable and much smaller. Artefacts — the smudges around letters or blocky patches in gradients — become visible when quality is too low for the content.
When a JPG is the right output
- A website or portal rejects PDF uploads but accepts images.
- You want to paste a page into a document, slide deck or chat.
- You need a preview thumbnail of each page.
- The PDF is mostly photographs, where JPEG is a natural fit.
- You want to protect the layout from being copied as text.
When it is the wrong output
- You need selectable or editable text — an image has none.
- You are archiving documents and want searchability — prefer PDF with a text layer.
- You need transparency or lossless detail — use PNG instead.
- You will re-print text-heavy pages — JPEG artefacts degrade small text.
Checking the result
- Zoom into the exported image and look at the smallest text on the page.
- Confirm the file size is reasonable for the resolution you chose.
- Verify the page count matches: one JPG per page, named clearly.
- Check that white pages stayed white and no colours shifted.
Color pages and grayscale documents
PDF pages render in their original colors unless you choose a grayscale option. Color pages produce larger JPGs because JPEG stores the three color channels; a grayscale export can cut file size significantly for documents that are mostly black and white anyway.
If the source is a color brochure that you intend to print in black and white, exporting grayscale saves bandwidth and printing toner, and the result looks identical on monochrome paper. If the document contains diagrams that use color to distinguish elements, keep color — grayscale can make those diagrams ambiguous.
Batch and long documents
A long PDF produces one image per page, so a 200-page manual at high resolution creates 200 large files. For sharing or embedding, most people only need a few pages — extract the pages you need first, or export at a modest DPI.
If every page is required as an image, plan for the total size: at 300 DPI a 200-page document can exceed a gigabyte of images. At 96 DPI the same document fits in a fraction of that, which is usually enough for on-screen use.
Privacy
Conversion happens in your browser. Pages are rendered and encoded locally, and the resulting images are generated on your device. Nothing is uploaded, so sensitive documents never leave your machine.