Center Crop to Exact Size
Center Crop to Exact Size: Calculates centered bounding box coordinates (x: 560, y: 140, w: 800, h: 800) and extracts sub-canvas.
About this center crop to exact size
Calculates centered bounding box coordinates (x: 560, y: 140, w: 800, h: 800) and extracts sub-canvas Processes media assets directly in the browser using HTML5 Canvas and WebAssembly decoders, ensuring zero file uploads.
Image processing & canvas pipeline
Calculates a centered crop rectangle from the selected image's dimensions and the requested output size, draws that rectangle to Canvas, and exports PNG. It does not offer manual crop positioning or preserve source metadata.
Worked image transformation example
Scenario: Center-crop a 12×9 four-color PNG to 6×6.
Sample input:
Processing: Canvas trims the longer source axis around the center before drawing 6×6.
Illustrative output:
Resolution, dimension & memory limits
The crop is centered and scaled to fill the requested dimensions; there is no manual crop-position control. Width and height are rounded and clamped to 1–4096 pixels, and the source must decode in a Canvas 2D browser.
Center Crop to Exact Size image operations execute in client memory via HTML5 Canvas and browser decoders. Inspect output previews before replacing source assets.
In-memory image processing boundary
File buffers and document assets in Center Crop to Exact Size are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Image format & W3C Canvas standards
W3C Canvas 2D context specifications and standard image container formats:
Center Crop to Exact Size verification · Audit standards
How to use it
- Choose a browser-decodable image.
- Enter the desired crop width and height in pixels, then select Process locally.
- Inspect and download the center-cropped PNG.
Frequently asked questions
How does center crop calculate the output?+
It compares source and target aspect ratios, trims the longer source axis around its center, then draws that rectangle at the requested target size. It does not offer a draggable crop rectangle.
Which controls and bounds are actually available?+
One image plus Width and Height fields are available; each requested dimension is rounded and clamped from 1 to 4096. There are no x/y offsets, anchors, rotation, freehand crop, padding, aspect presets, batch mode, or metadata preservation.
What example can I run locally?+
Use the downloadable 12×9 four-color PNG and request 6×6. The crop spans source x=1.5 through 10.5 and the output is 6×6; the left and right edges are trimmed equally.
Which input condition matters most?+
The image must decode in the browser. Output is a raster PNG at the clamped dimensions, and the crop is always centered rather than chosen interactively.