How to use this calculator
Plan resized GIF dimensions while preserving aspect ratio.
How the calculation works
- Enter current width and height.
- Enter a target width.
- The proportional height and scale percentage update immediately.
Formula
New height = original height x target width / original width.
Example
An 800 x 600 GIF resized to 400 px wide becomes 400 x 300.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- This does not resize a file; it calculates target dimensions.
- Actual file size savings depend on frames, colors, and encoder settings.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.