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150 DPI is the practical default: sharp on any screen, small enough to email, and fast to process even on a phone.
No upload. No watermark. No sign-up. Every tool mentioned here runs inside your browser.
A letter-size page becomes about 1275 × 1650 pixels. That fills a laptop screen at 100% zoom and looks crisp in a slide deck.
It is also roughly what a phone camera produces when scanning a document, so nothing looks artificially sharp or artificially soft.
Choose 150 for anything that stays on a screen. Choose 300 when the image will be printed or enlarged. 600 is only for large-format printing or archival copies.
The file-size difference is roughly 4× between each step, which is why 150 DPI is the right default for multi-page documents.
Not directly — export all pages, then delete the ones you do not need from the ZIP. Or split the PDF first.
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