The portal says 'below 18 KB' — how close can I get?

Aim just under, around 16–17 KB. Some portals reject a file that reports exactly at the limit because of rounding on their side.

Can a signature fit 18 KB?

Easily. Ink on white paper carries very little colour information, so a cropped signature at 18 KB usually looks clean even at full zoom.

Resize an image to 18 KB

18 KB is an unusually specific cap used by a handful of recruitment and admission portals, generally for a passport-style headshot at 200×230 px. Drop your photo in below — the target is already set to 18 KB, and everything runs inside this browser tab, so the image never leaves your device.

Target file size

Dimensions

Output format

How to get a photo under 18 KB without it turning to mush

Crop before you compress

Empty background costs bytes. Cropping tight on the subject leaves more of the size budget for the detail that matters.

Match the required dimensions

Most forms cap both KB and pixels. Set the dimension preset here as well so a 18 KB file is not rejected for being the wrong shape.

Use JPG for photos

PNG stores photos far less efficiently. Choosing JPG output often reaches the target with visibly better quality.

Who asks for 18 KB?

18 KB is an oddly specific cap that appears on some recruitment and university admission portals, usually alongside a 200×230 px photo spec or a 140×60 px signature box.

Settings that actually reach 18 KB

Set the pixel dimensions the form asks for first, choose JPG, then let the target do the rest. At 200×230 px an 18 KB headshot still holds facial detail as long as the background is plain.

The mistake that gets uploads rejected

Compressing a cropped screenshot of a photo. The screenshot has already lost detail once, so the second pass at 18 KB shows visible blocking. Always start from the original picture.

Questions about 18 KB uploads

The portal says 'below 18 KB' — how close can I get?: Aim just under, around 16–17 KB. Some portals reject a file that reports exactly at the limit because of rounding on their side.
Can a signature fit 18 KB?: Easily. Ink on white paper carries very little colour information, so a cropped signature at 18 KB usually looks clean even at full zoom.