An application form may reject a photograph that looks perfectly clear simply because its file is too large. A byte target is a different requirement from image dimensions or print size.
Target File Size Compressor searches a bounded set of JPEG quality levels without resizing the source. It returns a tested output that fits the target, or explains that the requested limit cannot be reached this way.
Use the unit shown by the tool
The target uses KB as 1000 bytes. A target of 200 therefore means an output no larger than 200,000 bytes, not 200 KiB.
| Entered target | Maximum bytes |
|---|---|
| 100 KB | 100000 |
| 200 KB | 200000 |
The output remains at the source dimensions. Transparent areas are flattened onto the selected JPEG background. The result's byte count is reported so you can compare it with the actual portal rule.
An impossible target needs a different step
A very low ceiling may remain out of reach even at a low tested quality. The tool reports that case instead of quietly reducing dimensions or claiming success with an oversized file.
Resize the source and try again when the destination permits smaller dimensions. For a signature or text scan, inspect readability carefully before sacrificing more quality.
The search is bounded and does not promise a mathematically global optimum among every possible encoder setting. Its practical promise is a file under the target when a tested choice fits.
Keep the original and compare the downloaded JPEG at the size it will be reviewed. Passing a byte limit is not enough if facial detail, lettering or a required background has become unsuitable for the receiving application.