Image size & formats
Why a file shown as 50 KB may exceed a 50 KB limit
Check exact output bytes when different programs round file sizes differently.
Displayed sizes can hide precision
A file manager may round the number it shows. Some programs also use 1,024-based units while labelling them informally. That can make a file appear to fit a boundary even when an upload validator counts a different number of bytes.
Use the tool's actual result
FormFile treats KB as 1,000 bytes and MB as 1,000,000 bytes. Enter the portal's ceiling, process the file and read the requirement status. For a maximum-only limit, a result slightly below the boundary is often more convenient than one exactly on it.
If the portal rejects a boundary file
Try a modestly lower maximum, such as 49 KB for a stated 50 KB ceiling, provided readability remains good and no minimum is violated. Do not change required pixel dimensions solely to avoid a rounding difference.
Keep the other checks
A smaller file can still fail for an unsupported format or incorrect dimensions. Check the error message before blaming rounding, and keep the original so a second attempt does not compound compression damage.
Ready to prepare your file? Use Image size & dimensions and check the downloaded result.