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When I drag my mouse through a ruler to create a new guide, I want this guide to move pixel by pixel so that when I leave it, it will have snapped to a side of a pixel instead of staying in the middle.

How can I achieve this?

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4 Answers

You need to be at 500% zoom or higher and then hold Shift+Mouse Button to have your guides snap to the pixel grid.

Otherwise, by default it'll snap to:

  • every 2 pixels at greater than 100% zoom
  • every 5 pixels at 100% zoom
  • every 10 pixels at less than 100% zoom

However, if you set your grid to every pixel, then it should snap to the pixel at 100% zoom or greater, even if Snap to>Grid isn't enabled. At zooms less than 100%, you'll need Snap to>Grid as well as have the grid enabled.

But I usually just use the rectangular marquee to mark out the positions where I want my guides to snap to. This avoids having to zoom in or having to change my grid settings.

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Nope, shift + move guide doesn't snap to the pixel grid... (Mountain Lion, Photoshop version 12.1 x64). Also tried combinations of keys and drag without any success. –  user13722 Jul 1 '13 at 20:48
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Positioning a horizontal guide in CS6, if you are zoomed in too far it snaps to Y: 0.0px. Zoom out a bit to get it to snap to pixels properly again. Frustrating. –  onemanarmy Sep 10 '13 at 20:22
    
@user13722 had a similar problem but realized that i had to turn on snap –  Chris B Mar 8 at 3:55
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Have you...

  1. turned on snap to guides?
  2. select a blank layer, so guides won't snap to anything else in the comp.
  3. set your ruler measurement by right clicking on the ruler.
  4. hold down shift + move your guide which snaps percisely to the ruler setting.

Also when you select View > New Guide and specify a vertical position does this snap correctly?

Sorry if this is duplicating previous suggestions.

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What definitively worked for me was the following in Adobe Photoshop CS6:

  1. Go to your menu bar and click on Edit > Preferences > Units & Rulers.
  2. Change Rulers's units to Pixels.
  3. Now drag your guides while pressing Shift.

enter image description here

Enjoy!

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You can hold Shift while dragging., at least in Windows.

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Hello, I did try it but it skips more than a pixel. Strange situation. Thank you. –  Phil Feb 19 '12 at 19:11
    
Have you tried zooming in? –  José Tomás Tocino Feb 20 '12 at 22:57
    
Yes, zoomed in or out, it jumps 3 to 4 pixels. ;-) –  Phil Feb 21 '12 at 0:58
    
It wouldn't have anything to do with what you've got set in your Preferences > Unit & Rulers or Guides, Grid & Slices –  jamesy Feb 21 '12 at 12:24
    
Wouldn't it? Why not? –  Phil Feb 21 '12 at 15:20
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