The Preview app has markup / annotate tools like rectangle, oval, line, text, speech bubble, thought bubble. Is there a pen or pencil tool that lets you draw lines in a freehand way?
(I'm using Preview version 7.0 (826.4) in OS X Mavericks 10.9.5)
MacOS – Does the Preview app have a freehand pen/pencil tool
image editingmacospreview
Related Solutions
By default the drawing engine in Preview can't be changed (in El Capitan or earlier) as it's a vector base drawing system. So it will always have some level of smoothing applied to it based on the algorithm Apple is using.
You can however turn off some of the smoothing for documents that store the drawing in vector format like PDF, but this will have a minimal effect at best for most drawings.
If you want to try turning off the vector smoothing under Mac OS X 10.11 El Capitan.
Go into the Preview -> Preferences... and choose the third tab PDF.
Un-checkmark Smooth text and line art.
Beyond that there isn't a way to turn off the math that drives the drawing tool in Preview.
But you can draw freehand circles in Preview, just select the shape you want to use in the upper left corner after you draw the shape. If you don't see the controls as below, go to View → Show Markup Toolbar
Best Answer
Yes, Preview in OS X 10.10 (Yosemite) has a freehand tool. Access it within Preview from the "Markup Toolbar" icon of the .JPG or .PDF file you have open.
When you click on that icon, the Markup toolbar appears, and the freehand "sketch" tool is the 3rd icon from the left, in blue in the image below.
and it offers a smoothing option as well as a freehand mode.