Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

100% zoom / actual size / current zoom controls

On many widescreen monitors, when viewing portrait documents, fit width is zoomed in too close but fit whole page is too small. Is it possible to add a button that zooms to 100%/actual size between the two? I know it’s a menu selectable option, but for old point-and-click users, it’s 3 clicks away.


Ctrl+1 should be 100% (Actual size) = 2 keys but better still

If you change zoom > custom zoom (Ctrl+Y) to 100% (or any other preference)
then I think you will find either page button will toggle from custom to default ?

this value is stored for each file but can change from session to session especially if you alter it, SO if you want to store your
DefaultZoom = 100 for the next session you need to alter Settings > options > default zoom

then opening the next fresh file or session will use that value

I know there are non-GUI ways to achieve this but I think your suggestion doesn’t appreciate the average pernon’s level of computer literacy. The majority of adults I have worked with didn’t even know about Alt + Tab until I explained it to them, and many of those forgot it existed afterwards. Personally, I think the default zoom causing documents to be too small to read is a mistake, and not having an obvious button to correct it compounds the problem.

I dont write SumatraPDF thats @kjk,
so can only advise the best options to help you

With your specific mix of hardware you may wish to
click on
then options then set your prefered Default Zoom value (100% ?)

then see if using the standard buttons suites your preference

I had already set defaults to 100% when installing for everyone, thank you. My point is that it cannot be reset from the main toolbar, and new users with limited ability are not going to have documents at a readable size by default. @GitHubRulesOK I appreciate your effort to help, but this is really only fixable in code.

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You might want to read the dev’s thoughts on this.

Maybe the solution is to have 100% be the default zoom level upon install, then, and/or change the two zoom buttons into one tri-state button that cycles through 1:1, fit width, and fit whole.

Wanting a tidy toolbar is not a good reason to have the default behaviour of a document reader cause documents to be difficult to read.

I’d like to find a way to set the default zoom to actual size when opening a file

but in the options dialog I can’t seem to find the actual size in dropdown menu.

I don’t want to press ctrl + 1 every time I open the document to change the zoom manually.

any solution?

“Actual Size” should be 100% unless you adjust screen scaling dpi


It would be nice to know what zoom % i’m at while reading.

I moved your comment to this thread as its related.
The current hot key to check zoom is CTRL+Y as described above

The old link above as to reason its not included on toolbar is dead, but in short the answer was a small toolbar with about 12 small icons was considered as fitting width of majority of devices (think older tablet in portrait mode). Rotation was recently included as highly demanded over the years.

Oh wow i didn’t know about this hot key. thanks.