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Congrats for the best lightweight PDF reader ever that I’m using since years…

Small question: is the “Ruler” feature (or any other way to measure things in millimeters) implemented? I found a discussion about it here: Ruler (, but I can’t find it the latest version (I used SumatraPDF-3.1.2-64-install.exe).

All the best


As mentioned in that thread the status was primarily “wont fix”, however the concession was to add a basic feature to the pre-release version (eventually available with stable version 3.0 onwards), which AFAIK should still work the same way.

Quoted from

Thanks for the suggestion. I’ve created an experimental implementation of something along your description with r9022.

Please download a pre-release build from (revision 9022 or later once it’s available), open a document and then hit the M key (for “Measurement”) to see what we’ve currently got - and keep hitting M for changing the measurement unit. To get even closer to an actual ruler, try selecting part of the page while keeping the Ctrl key pressed.

It is very rudimentary and I along with others wanted more, but I have often used it as it’s better than nothing. Perhaps other helper apps mentioned in that same thread are more useful, but I have not tested them recently.


Perfect like this, I didn’t notice it was also present in PDFSumatra-3.1.2-64 because it was not in the menus, but the “m” key shortcut is perfect, thanks!

(a little improvement could be: displays position (like it is currently) + also displays distance between the current click position and the previous click position, so it would be like a real ruler that can measure distances)