WebToolArcCalculator + editor
Most ratio calculators stop at the missing dimension. This studio keeps that exact math, then carries the same ratio into contain/cover planning and a real local crop-or-pad export.
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Image Aspect Ratio Calculator
Calculate exact image ratios and proportional dimensions, compare contain versus cover, then crop or pad a local image to a target ratio and export the result without uploading it.
browser-local · ratio math + real image handoff
Exact ratio evidenceAspect Ratio & Crop Studio
Find exact ratios, solve proportional dimensions, compare contain versus cover, then crop or pad a local image to the target ratio and export the result without uploading it.
16:9Exact integer ratio
1.77778:1Decimal ratio
LandscapeOrientation
16:9Closest common ratio
2,073,600Total pixels
2.074 MPMegapixels
Proportional dimension solver
1280 × 720 pxInteger dimensions are rounded to the nearest pixel.
Resolution ladder at the source ratio
| Width | Matching height | Scale vs source | Megapixels |
|---|
Fit the source into a target frame
Contain size—
Total padding—
Cover size—
Total crop overflow—
Source area kept—
Source area cropped—
Process a local image
Nothing is uploaded. The browser decodes the chosen image only inside this tab.
Batch ratio audit · up to 200 rows
Paste label,width,height or just width,height. Invalid rows stay out of the results rather than being guessed.
| Label | Dimensions | Exact ratio | Decimal | Orientation | Nearest common | Error | MP |
|---|
Project & repeat-use handoff
No silent stretching
The fit audit makes the tradeoff explicit: either preserve every source pixel and accept padding, or fill the frame and accept cropping. Independent X/Y stretching is not presented as a ratio-preserving operation.
Developer handoff
Copy the CSS aspect-ratio/object-fit/object-position contract, export a project, or batch-audit dimensions without storing the source image on WebToolArc.
Core image workflows
Use a flagship page for the highest-demand resize, compression, crop and conversion jobs; specialist image tools remain available from the full hub.
Image ResizerResize by pixels or percentageImage CompressorReduce file size with controlsImage CropperCrop visually or by coordinatesImage ConverterConvert JPG, PNG and WebPJPG to PNGConvert JPEG into PNGPNG to JPGExport PNG as JPEGHEIC to JPGConvert phone HEIC/HEIF photosWebP to JPGExport WebP as JPEG
Aspect ratio is shape, not resolution
An aspect ratio is width divided by height. Reducing 1920×1080 by the greatest common divisor gives 16:9, but a nearby size such as 1366×768 reduces to 683:384. Snapping every near-widescreen source to 16:9 hides real geometry and can create unexpected crop or padding later.
Contain and cover answer different questions
Contain scales until the whole source fits inside the target frame, so one axis may have empty bars. Cover scales until the frame is full, so one axis may overflow and be cropped. The fit planner reports both scale factors, bar/crop amounts and the approximate source-area loss.
Crop with a focal position instead of assuming center
Center crop is common, but it is not always safe for faces, products or text near an edge. The local image workflow supports nine focal positions and applies the same geometry to the real exported crop.
Padding preserves the full source
When nothing can be cut off, fit/pad places the whole source in the target ratio and fills the remaining canvas with a chosen colour or transparent pixels for PNG. JPEG/WebP exports cannot preserve transparency in the same way.
Do not confuse aspect ratio with file quality
A ratio says nothing about sharpness, compression, colour profile or whether an image has enough pixels for a particular print or display size. Use a resolution or print-density tool when pixel count and physical output matter.
Local processing and export limits
Chosen images are decoded and transformed in the browser and are not included in settings links or local saved settings. Browser image decoders and encoders vary by format, and very large canvases consume significant memory, so export is capped at 80 megapixels.
Browser-local limits
Canvas-based export is browser dependent. PNG is broadly available; JPEG/WebP quality and support can vary, and metadata may not be preserved through canvas re-encoding.