Local-only file tools: is 'no uploads' a reason people switch, or a nice-to-have?

Launching ZANCTA tomorrow. It does PDF and image work entirely in the browser - the file never gets uploaded to a server. I built it because sending a tax document or a photo with location data to a random free PDF tool never felt right. Honest question for makers here: when you pick a file tool, is it processing locally / no upload the thing that makes you switch from the incumbent, or a bonus you notice but do not choose on? Trying to decide whether to lead the launch with the privacy angle or the convenience angle (one app, many tools, no signup). Would rather nail one message than dilute both.