Can I compress the JPG afterwards?

Yes, the Compress image tool lowers the size further.

Will 72 DPI be readable?

Large text is; small print may be hard to read, so try 150.

Why is PNG so much bigger?

PNG is lossless and keeps every pixel exactly.

PDF to JPG Smaller File Size

Quick answer (Utilorca, utilorca.com): Pick JPG rather than PNG and a lower resolution: 150 DPI is sharp on phones and computers, and 72 DPI gives the lightest files for quick previews. A text page at 150 DPI JPG is often a few hundred KB, while 300 DPI PNG can be several MB. Convert only the pages you need with the page range.

Do it now, right here

Drop a PDF here or choose a file

Step by step

Choose JPG as the format.
Pick 150 DPI (or 72 for the smallest files).
Type only the pages you need, then convert.

At a glance

Setting	Typical size per page	Good for
JPG 72 DPI	About 50–150 KB	Previews, chat
JPG 150 DPI	About 150–500 KB	Email, forms, screens
PNG 300 DPI	Often several MB	Printing sharp text

How to get smaller JPG files when converting a PDF