By size · 20 KB
Increase image
to 20 KB.
Twenty kilobytes is a tight budget — usually a signature strip or a thumbnail avatar. This tool lands the file on exactly 20 KB in either direction: it adds weight when a form sets a floor, and trims when the form sets a ceiling. Pixels never move.
No upload · no sign-up · no watermark
01 · The floor
Why a form names exactly 20 KB
A 20 KB figure almost always belongs to a signature or an avatar, not a full photograph. Signature strips are wide and shallow, so 20 KB carries plenty of data for one; avatars are displayed at 96 or 128 pixels, where 20 KB is already generous.
The catch is direction. Some portals write “minimum 20 KB”, others “maximum 20 KB”, and both errors look identical to the person uploading. This page hits the number either way — the button says which direction it is about to move before you press it.
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 20 KB?
Drop the image in, set the target to 20 KB, and press the button. If the file is lighter than 20 KB the engine re-encodes at the highest quality your pixels allow and tops up the remainder with a metadata block; if it is heavier, the same button compresses instead. Either way the file lands on 20 KB and the width and height never change.
Is 20 KB a minimum or a maximum?
Both exist. Signature and avatar fields more often set 20 KB as a ceiling; a few older portals set it as a floor. The tool reads the file you drop in and the target you set, then labels the button “Increase to 20 KB” or “Make it 20 KB”, so the direction is never a surprise.
Will a 20 KB file still look acceptable?
For a signature strip or a 128-pixel avatar, yes — that is roughly what those fields are designed around. For a full-resolution photograph it is a hard squeeze, and the result panel says so when the image had to be downscaled. If the form allows a larger number, take the larger number.