About Scanto

Most free "image to PDF" tools on the web quietly upload your photos to a server to process them. That's a reasonable trade-off for a simple format conversion — but it's a poor one when the photo is your ID card, a medical form, or a signed contract.

Scanto takes the opposite approach: every step — detecting the page, straightening the perspective, applying a black-and-white filter, and assembling the final PDF — runs entirely in your browser, using the same Canvas and Web Worker APIs any modern site has access to. Nothing is uploaded, because there is no upload endpoint to send it to.

The trade-off, for now: corner detection is manual (you drag four handles onto the page), rather than fully automatic. We think that's a fair price for a tool that never has to ask you to trust a server with your documents, and automatic detection is on our roadmap.