By size · 100 KB
Increase image
to 100 KB.
One hundred kilobytes is the default floor on more upload forms than any other number. Drop an image in and it lands on 100 KB exactly — pixels, format and DPI untouched, and nothing leaves your browser.
No upload · no sign-up · no watermark
01 · The floor
Why 100 KB became the default floor
A 100 KB floor is a rough proxy for “this is a real photograph, not a thumbnail that has been emailed around five times”. It is high enough to exclude squeezed previews and low enough that a phone photo passes without any work at all.
Because it is a round number it also travels: guidance documents are written once and copied into job portals, university applications and insurance claims. When a form says “minimum 100 KB”, this is the number it means.
02 · The mechanism
How the size is reached
Re-encode at the highest quality those dimensions can hold
The encoder is pushed until the file is as large as your existing pixels allow. These are real image bytes, and they survive a portal that re-encodes whatever it receives.
Top up the remainder with declared metadata
If maximum quality still lands under the target, the gap is filled with a standards-compliant segment — a JPEG comment, a PNG tEXt chunk, a WebP JUNK chunk. Every viewer ignores it; pixel data, dimensions and DPI stay untouched.
Portals that re-encode every upload will strip metadata, and the file falls back to its real-pixel weight. That is why the quality step runs first — bytes carried by pixels survive re-processing; bytes carried by metadata do not.
What stays the same
03 · Questions
Questions people actually ask
How do I increase an image size to 100 KB?
Drop the photo in, keep 100 KB selected — it is the default target on this tool — and press the button. The file lands on 100 KB exactly, with the width and height unchanged, and the download name records the new size.
My file is 240 KB already. Does this page help?
Not for raising it. If the form states 100 KB as a maximum you want compression, and the tool switches to that automatically: the button becomes “Make it 100 KB”, the output sits at or just under the target, and it is never larger than what you started with.
What is the difference between 100KB and 100 KB?
Nothing. “100KB”, “100 KB” and “100 kb” all mean one hundred kilobytes; spacing and capitalisation carry no meaning in a file-size limit. The same applies to the search term image increase size 100 kb — it describes exactly this page.