Find an image’s simplified aspect ratio and calculate matching width, height or scaled dimensions. Use common presets, a scale slider or local image dimensions, with whole-pixel rounding clearly shown.
No file selected.
No image selected.
Static PNG, JPEG or WebP · 20 MiB and 40 MP. The image is decoded only to read its oriented dimensions, then released. No image is kept or resized.
The diagram is scaled to fit, with a minimum visible thickness for extreme ratios. Calculations allow up to 100,000 px per side for planning; image tools have their own processing limits. This tool does not modify or download an image.
Ready to change an image? Open Image Resizer or Batch Image Resizer and enter your calculated size.
Your dimensions and optional image stay on your device. All calculations happen locally, and imported images are decoded only to read oriented dimensions before being released. No files are uploaded, no account is required, and no input history is stored.
Source width and height are reduced by their greatest common divisor. A target width calculates height from the source ratio; a target height calculates width. Percentage mode scales both source dimensions. Calculated dimensions round to the nearest whole pixel with a minimum of 1 px, and any ratio difference is explicitly reported.
Yes. Percentage mode has a synchronized slider and exact input from 1 to 1,000%, in steps of 0.1%. Width and height modes use exact whole-pixel values. The calculated side is read-only; switch modes to edit the other side.
No. This is a dimension-planning calculator. Optional image import reads its dimensions only and releases the decoded image. Open Image Resizer, Batch Image Resizer or Image Cropper to process a file. The preview is a proportion diagram, not an image preview.
Manual source and target dimensions are limited to 1–100,000 px per side for planning. Actual image tools have smaller processing limits. Optional static PNG, JPEG or WebP files must fit within 20 MiB, 40 MP and 16,384 px per side. Browser orientation applies. Extreme preview proportions use a minimum visible thickness. TXT reports include dimensions and ratios without the source filename or image.
