ImageCompress converts the entered decimal KB value to exact bytes, tests the browser encoder at bounded integer qualities and keeps the highest tested candidate at or below the budget. It does not add padding to hit an exact number and does not reduce dimensions behind the scenes. The displayed result is evidence from the current browser, not a prediction.
Treat not met as useful evidence
If quality 10 still exceeds the budget, the tool returns that tested Blob with TARGET_NOT_MET instead of claiming success. A detailed high-resolution image may simply contain too many pixels for the requested bytes. Decide whether a larger limit is acceptable or open ImageResize and deliberately reduce dimensions.
Inspect the actual output
The preview and download point to the same browser-created Blob, so compare edges, gradients, text and transparent areas before using it. The byte count is exact for that Blob, but another browser or codec version may produce different bytes from the same visible settings. Keep the original file until the destination accepts the result.
Inspect the actual output
The preview and download point to the same browser-created Blob, so compare edges, gradients, text and transparent areas before using it. The byte count is exact for that Blob, but another browser or codec version may produce different bytes from the same visible settings. Keep the original file until the destination accepts the result.