Edit a PDF, combine a few, cut one down, shrink it for email, convert it, sign it or lock it. Every tool here runs inside your browser: your document is opened, changed and saved on your own device and never sent to a server.
Yes — no account, no trial, no page limits and no watermark on the result. The work happens on your device, so there is no per-file cost to charge for.
No. Every tool runs in the browser tab. Turn the network off after the page has loaded and the tools still work, which is the easiest way to check.
There is no server-side limit because there is no server involved. The practical ceiling is your own device’s memory.