Stretching a photo in Google Slides by dragging the wrong handle makes it look squashed or distorted. Locking the aspect ratio keeps the width and height in proportion whenever you resize. Google Slides has a Lock aspect ratio checkbox in Format options, and a couple of mouse tricks that do the same thing. This guide covers both, plus how to fix a picture that’s already distorted.
Quick Answer
Select the picture, click Format options in the toolbar (or right-click > Format options), open Size & Rotation, and check Lock aspect ratio. Now changing the width or height adjusts the other automatically.
How to Lock a Picture’s Aspect Ratio
- Click the picture on your slide to select it.
- Click Format options in the toolbar. You can also right-click the picture and choose Format options, or use Format > Format options.
- In the panel on the right, expand Size & Rotation.
- Check Lock aspect ratio.
- Type a new Width or Height, or a Scale percentage; the other dimension updates to keep the proportions.
The setting applies to that picture only. Repeat for each picture you want to protect.
Resize Proportionally With the Mouse
- Corner handles: dragging a corner handle of a picture keeps its proportions by default.
- Side handles (top, bottom, left, right) stretch in one direction and distort the picture. Avoid them unless you want that effect.
- Shift + drag a corner to force proportional resizing, which also works for shapes and other objects.
- Alt/Option + drag resizes from the center instead of the opposite corner.
Fix a Picture That’s Already Distorted
- Right-click the picture and choose Reset image (or click Reset image in the toolbar). This restores the original size and proportions, and also removes crops and adjustments.
- Then lock the aspect ratio and resize from a corner.
If you want to keep a crop, open Format options > Size & Rotation and set Scale width and Scale height to the same percentage instead.
Fit a Picture to a Specific Shape or Size
- Crop to a ratio: select the picture, click the arrow next to the Crop button, and choose Aspect ratio (for example, Square 1:1 or 16:9).
- Mask to a shape: choose Mask image from the same menu and pick a circle, rounded rectangle, or other shape.
- Full-slide background: use Slide > Change background > Choose image so the picture fills the slide without distortion.
Frequently Asked Questions
Why is Lock aspect ratio missing?
Make sure a single picture or object is selected, not text inside a text box or a group of several items.
Can I lock the position of a picture so it can’t move?
Google Slides doesn’t have a lock-position option. Putting the picture on a layout or master (Slide > Edit theme) keeps it from being moved on regular slides.
Does locking the aspect ratio affect cropping?
No. You can still crop freely; the lock only affects resizing.
Summary
- Select the picture and open Format options.
- Check Lock aspect ratio under Size & Rotation.
- Resize using corner handles, or hold Shift while dragging.
- Use Reset image to fix distortion.
Kermit Matthews is a freelance writer based in Philadelphia, Pennsylvania with more than a decade of experience writing technology guides. He has a Bachelor’s and Master’s degree in Computer Science and has spent much of his professional career in IT management.
He specializes in writing content about iPhones, Android devices, Microsoft Office, and many other popular applications and devices.