Smart PDF Filler finds the boxes, lines and signature spaces for you. Hover and click: tick, cross, type, date, sign.
You can also paste a PDF, or use Open with once the app is installed.
Sign with your mouse, finger or pen.
A photo of your signature on white paper works well; the background is removed.
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Your documents stay on this device. Nothing is uploaded, and there is no account to create.
Subscribing is handled by the app store, so it is available in the installed app rather than in a browser.