Metadata that can add bytes
EXIF camera fields are often relatively small. Embedded thumbnail previews, XMP editing history, ICC color profiles and application-specific blocks can add more. Files can accumulate metadata as they pass through cameras and editing software.
The exact amount depends on what was embedded. Do not assume that stripping metadata will produce a large reduction, especially if the image itself is high resolution or visually complex.
Metadata is not the only optimization
Resizing and choosing a suitable encoding often affect file size more than removing descriptive fields. Lossless removal can preserve pixels, while re-encoding may change them depending on format and browser.
If color consistency matters, be careful with ICC profiles. A file that is smaller but loses color-management information can render differently in some workflows.
Frequently asked questions
How much space can metadata removal save?
There is no fixed amount; it depends on embedded fields and previews in the individual file.