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Free to use for 2 documents a month. No account needed.

Windows 10 and 11

Smart PDF Filler for Windows

Version 1.1.4. Installs just for you, without needing an administrator. Worth it if you fill forms often: it opens PDFs straight from File Explorer and works offline. The Windows app also opens Word documents (.docx): they are turned into a PDF on your own computer, so you can tick and sign them the same way.

Download for Windows About 120 MB. Once installed, right-click any PDF and choose Open with > Smart PDF Filler.
Android

Smart PDF Filler for Android

On Google Play now. Open PDFs straight from Gmail, Files or Drive, tick and sign with your finger, and pinch to zoom in on the small boxes. It opens Word documents (.docx) too, turned into a PDF on your own phone.

Get it on Google Play

Installing on Windows

Open the downloaded file and follow the steps. It installs for you alone, so Windows will not ask for an administrator password.

Two warnings are normal for a newly released program. Neither means anything is wrong with the file.

Your browser says the file "isn't commonly downloaded". Click the three dots or arrow beside the message and choose Keep.

Windows says "Windows protected your PC". Click More info; the box grows and shows Run anyway. Click that.

Prefer not to install anything? Use it in your browser instead.