Use width, height and aspect ratio intentionally.
Quick answer
The browser canvas draws the source image at the requested pixel dimensions.
Pixels
The browser canvas draws the source image at the requested pixel dimensions. In this context, pixels matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Aspect Ratio
The browser canvas draws the source image at the requested pixel dimensions. In this context, aspect ratio matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Upscaling
The browser canvas draws the source image at the requested pixel dimensions. In this context, upscaling matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Practical example
Use the matching Get Tools Lab Image Resizer tool with a small, non-sensitive example first. Confirm the expected result before using a larger or important input.
Privacy and limitations
Processing behavior depends on the tool. Priority browser-local tools identify that behavior on the tool page. A local browser workflow reduces server upload exposure, but it does not remove the need to protect the source file, device and downloaded result.
Related workflow
Open Image Resizer. You can also use the related comparison, glossary and topic pages to understand the format and trade-offs.