Privacy Policy
Local thumbnail checks
Your thumbnail image is processed locally in your browser. ImageSizeKit does not upload, store, or inspect your image file. The YouTube thumbnail checker reads dimensions, file type, and file size through browser APIs.
Analytics
We may collect basic usage events such as checker viewed, checker completed, overall status, width bucket, file size bucket, and failed rule IDs. We do not send file names, local paths, image URLs, raw images, or binary data.
Official sources
ImageSizeKit links to official help pages when a tool depends on platform requirements. Always check the official source before publishing important assets.