Image dimension converter
A free online tool to compute target image dimensions from source dimensions with optional aspect ratio preservation.
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Worked Example & Common Values
Below is a sample worked calculation demonstrating how Image dimension converter processes input data instantly inside your browser.
Birth date: Jan 15, 1995, Target date: Oct 20, 2023
Chronological Age: 28 Years, 9 Months, 5 Days (10,505 days elapsed)
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About This Tool
Conceptually, you input source_width and source_height in pixels, and either target_width or target_height. The tool calculates a scale factor and reports final_width and final_height in px. If aspect preservation is enabled, one provided target dimension determines the scale and the other is derived to maintain the original proportion.
If both target dimensions are provided, the tool reconciles them according to the chosen mode (preserve aspect or override), and notes any resulting changes in aspect ratio. Outputs also include applied_scale and, when relevant, a suggested canvas size for web or print pipelines. The tool does not modify actual image data; it provides dimension guidance that can be pasted into editors, CMSs, or build pipelines. Beneficiaries include web designers, marketing teams, and developers who need precise, repeatable size adjustments across multiple assets. Unique value lies in combining straightforward math with optional fit strategies and clear, export-ready outputs. Core features include input validation, aspect-ratio handling, unit-consistency, and precise px results. Use cases include resizing banners, thumbnails, and hero images while maintaining proportion and target bounds.
How to Use
Provide inputs: source_width, source_height (in px).
Choose whether to preserve aspect ratio.
Enter target_width or target_height (px) as needed.
The tool computes final_width and final_height (px) and the scale factor.
Review outputs and export results to your workflow.
Frequently Asked Questions
Find Quick Answers
What units are supported?
What happens if both target dimensions are provided?
Will this tool modify my image?
Need to run multiple calculations?
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