You want a chart from a report on slide 6. The obvious move is a screenshot, and the obvious result is a slightly blurry rectangle that looked fine on your laptop and looks terrible on the projector.
The reason is resolution. A screenshot captures what is on your screen — maybe 150 pixels across for that chart. A projector or a large monitor wants considerably more.
Converting the page properly
At 300 DPI an A4 page renders at roughly 2480x3508 pixels. Scale that down to fit a slide and it stays sharp, because you are shrinking a large image rather than stretching a small one.
PNG or JPG?
For anything from a document, use PNG.
PNG is lossless, so text edges and thin chart lines stay crisp. JPEG compression is built for photographs and produces visible artefacts around high-contrast edges — exactly what text and line art are made of. A JPEG of a chart gets a faint halo around every line.
Use PDF to JPG only if the page is a full-page photograph, or if file size is a genuine constraint and the page has no fine detail.
Cropping to just the chart
The conversion gives you the whole page. You usually want one figure from it.
Two approaches:
Crop in your presentation software. PowerPoint, Keynote and Google Slides all have a crop tool. Insert the full page, crop to the figure, and the original stays intact underneath so you can adjust later. This is usually the better option.
Crop the image first in any image editor if you want a clean asset to reuse.
Either way, crop from the 300 DPI render rather than screenshotting the region — you keep the resolution.
Keep it as a picture, not as text
A tempting alternative is extracting the text and rebuilding the figure natively on the slide. Sometimes right, often not.
Rebuild it natively if it is a simple table of a few rows, or a short quote. It will match your deck's styling and stay editable.
Keep it as an image if it is a chart, a diagram, a form, or anything where layout carries meaning. Rebuilding a complex figure by hand takes an hour and usually looks worse.
An image also guarantees it renders identically everywhere, which matters when you are presenting from someone else's machine.
Attribution
If the figure came from a published report, put the source on the slide. A small line under the figure — publication, year, page — is standard practice and takes five seconds. It also saves the awkward question from the audience about where the number came from.
Batch converting a whole document
If you need many pages — turning a full report into a slide deck, or extracting every figure — convert the whole PDF at once and download the pages as a set, then pick what you need. That is faster than converting one page at a time and means you have the rest available when the deck changes.
For a very long document, convert the range you need with Split PDF first, then convert the extract to images. Rendering 400 pages at 300 DPI when you need six is a lot of waiting for nothing.