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Percentages, tips & quick math
Resize an Image Keeping the Aspect Ratio
Resize an image or video without distortion by locking its aspect ratio. Enter the original width and height (or pick a preset like 16:9), then type the new width and the calculator returns the height that keeps the same ratio (new height = new width × original height ÷ original width) — or type the new height to get the width. For example, a 1920 × 1080 image resized to 1280 wide becomes 1280 × 720. Everything is computed in your browser; nothing is uploaded.
new height = new width × (orig height ÷ orig width)
- 1920 × 1080 → resize to 1280 wide = 1280 × 720
- Locking the ratio prevents stretching/distortion
Frequently asked questions
How do I resize an image without stretching it?
Keep the aspect ratio: new height = new width × (original height ÷ original width). Enter your original size and one new dimension and the calculator returns the other so the image is not distorted.
What is 1920×1080 resized to 1280 wide?
1280 × 720. Both are 16:9, so the image scales down cleanly with no distortion.