How do I resize an image without changing its proportions?
Quick answer
Keep the image’s aspect ratio locked, then change either its width or height; the other dimension should adjust to preserve the original proportions. In Publisher, the “Lock aspect ratio” option does this when you change either dimension. [S1] If your editor has no such control, calculate the second dimension from the original width-to-height ratio. Compare familiar shapes with the original to check for distortion.
The question, the details, the next step.
I need a smaller image, but I don’t want faces or objects to look squashed. What should I do?
Preserve the image’s aspect ratio: its width-to-height relationship. In your editor, look for a control such as a chain, lock, or “keep proportions” option. When it is enabled, enter a new width or height and let the editor calculate the other dimension. In Microsoft Publisher, “Lock aspect ratio” keeps an object’s original proportions when either dimension changes. The instructions describe specific Publisher versions, so don’t assume another editor has the same controls. [S1]
If your editor has no ratio lock, calculate the missing dimension from the original width and height. Avoid setting width and height independently unless you intend to change the image’s shape.
How do I work out the second dimension if I only know the width I want?
Use the original dimensions as a ratio. Divide the original height by the original width, then multiply that result by your new width.
For example, suppose the original image is 1200 pixels wide and 800 pixels tall. The height-to-width ratio is 800 ÷ 1200, or two-thirds. If you want a width of 600 pixels, calculate 600 × two-thirds: the corresponding height is 400 pixels. The new dimensions, 600 × 400, keep the original ratio. This example illustrates the calculation; use your image’s actual dimensions.
My app has width and height boxes, but I can’t tell whether proportions are locked. How can I check?
Look near the dimension fields for a lock, chain, checkbox, or wording about maintaining proportions. If you’re unsure, note the current dimensions, change just one field slightly, and see whether the other changes too. Undo the change if needed. Editors may use different controls, so don’t assume a particular icon or setting behaves the same everywhere.
If you can’t confirm that the ratio is locked, calculate the second dimension from the original ratio and enter both values. Then compare the result with the original. Avoid dragging just one side of the image unless you know the editor is preserving the ratio.
What would stretching look like, and what should I check before I save?
Stretching changes the width and height by different proportions, so familiar shapes may look unusually wide, narrow, tall, or short. For example, a circular logo may look oval, or a face may appear broader than in the original. These are visual clues rather than a precise test; compare features you recognize in the original and resized versions.
Before saving, check that the displayed dimensions match your intended size and that recognizable shapes still look right. If the editor’s behavior or the intended dimensions are unclear, consult that editor’s help rather than guessing.
A practical checklist
Note the image’s original width and height.
Find and enable the editor’s aspect-ratio or proportions lock, if available.
Change one dimension and let the other adjust automatically.
If there is no lock, calculate the second dimension from the original ratio.
Compare familiar shapes in the original and resized image before saving.
A few more useful answers
Can I change both width and height and still preserve proportions?
Yes, if both new dimensions keep the same ratio as the original. Otherwise, the image’s proportions change. Calculate one dimension from the other or use the editor’s ratio lock.
What if I don’t know whether the ratio lock is on?
Look for a setting about locking or maintaining proportions. If you’re unsure, change one dimension slightly and see whether the other changes too; undo the change, then calculate the dimensions from the original ratio if needed.
Does the Publisher guidance apply to every image editor?
No. The cited instructions describe specific Publisher versions and do not establish that other editors use the same controls. Check your editor’s help for its equivalent setting. [S1]
Sources
References used for this guide.
- [S1] Resize a picture, shape, text box, or other object support.microsoft.com · Checked