Resize Image to 10KB
To resize an image to 10KB, the tool above is already set for it. Almost everyone who needs this size is uploading a signature, and almost every portal that asks for 10 KB really means 10 KB to 20 KB.
That range matters more than the single number. Read the section below on floors before you upload, because a signature that comes back at 6 KB is refused just as firmly as one at 25 KB.
Is 10 KB a target or the bottom of a range?
On Indian exam portals 10 KB is almost always the floor of a window rather than a target to hit. SSC and IBPS both ask for a signature between 10 KB and 20 KB, which means the file has to clear 10 KB, not merely stay under it.
Where most tools fail at this size
A signature is a small, simple image, so a compressor aiming only at “under 10 KB” often lands at 5 or 6 KB without meaning to. The portal then refuses it for being too light, and nothing on screen explains why.
Pick a form preset in the tool above and both ends of the window are respected, so the file lands inside 10 KB to 20 KB rather than sliding under the floor.
Why do signatures compress differently from photos?
A signature is line art, not a photograph. It is a few dark strokes on white paper with nothing in between, and that hard edge is the exact pattern JPEG handles worst. A face is made of soft gradients where the format can hide its errors, so the same compression that flatters a portrait wrecks a signature.
What the grey halo actually is
JPEG stores an image as waves rather than as pixels. A sudden jump from black ink to white paper needs many waves to describe, and when the file is squeezed those waves get trimmed. What is left ripples outward from every stroke as a faint grey shadow. Printers call it ringing, and it is why a compressed signature looks smudged rather than merely soft.
The good news is that a signature carries very little information to begin with. Even at 10 KB there is room for clean strokes, provided the file is not wasting its budget on things that are not the signature.
How do I get a clean signature at this size?
Almost every bad result at 10 KB comes from the photograph, not the compression. Fix these four things before you upload and the file will land in range with the ink still sharp.
Crop tight
Empty paper still costs kilobytes. Crop until the signature nearly fills the frame, leaving only a thin white margin, and every byte goes to the ink instead of the page.
Plain paper
Ruled paper is the quiet killer here. Every printed line is extra detail the file has to store, so it eats your budget and leaves less room for the ink.
No shadows
A shadow across the page turns flat white into a grey gradient, and gradients cost far more to store than plain white. Shoot in even daylight, not under a single overhead bulb.
Black ink
Black on white gives the strongest contrast, which survives compression better than blue. Several boards also require black, and capital letters are commonly refused.
Which forms ask for 10 KB to 20 KB?
The 10 KB to 20 KB window is the most common signature specification on Indian recruitment portals. Photographs almost never sit this low, so if a form asks for 10 KB it is nearly always asking for your signature.
| Form | Signature size |
|---|---|
| IBPS bank exams | 10 KB to 20 KB, 140 × 60 pixels |
| SSC | 10 KB to 20 KB |
| Railway recruitment | 10 KB to 20 KB on most notifications |
| UPSC | A wider range, with a higher floor |
Our government form photo and signature sizes reference lists what each exam asks for, with the date each figure was last verified.
My signature will not reach 10 KB. What now?
This happens when the original photograph is already tiny, or when it has been cropped so hard that almost nothing is left. Compression can remove detail but it cannot invent detail that was never there, so the file simply refuses to grow.
Take the signature again on a larger sheet, fill more of the camera frame, and shoot in daylight. If the original genuinely cannot be replaced, the increase image size in KB tool adds weight until the file clears the floor.
Is my signature safe here?
It never leaves your device
Your signature is not uploaded anywhere. Every step runs inside your browser, so there is no server copy to delete later and no retention period to trust. Turn your internet off once the page has loaded and the tool still works.
Worth checking wherever you resize a signature. Several popular tools do send the file to a server and simply promise to delete it after a set time, which is a very different arrangement from never sending it at all.
Need a nearby size?
15 KB sits in the middle of the signature window and is the safest single number when a form gives a range. 20 KB is the ceiling of that window and the floor of most photograph limits, which makes it the busiest size of all.
Common Questions
Should I aim for 10 KB or 15 KB?
When a form gives a range, aim for the middle. A file near 15 KB clears the floor with room to spare and stays well under the ceiling, which leaves no argument either way.
Can I do this in MS Paint?
Not reliably. Paint changes width and height but shows you nothing about the resulting file size, so hitting 10 KB becomes guesswork with a save and a check after every attempt. It also cannot enforce a floor.
Will the ink still be readable at 10 KB?
Yes, if the photograph is cropped tight and shot on plain white paper. Some detail is always given up, because JPEG is a lossy format, but a well-cropped signature holds its strokes comfortably at this size.
Can I upload a PNG or an iPhone photo?
Yes. JPG, PNG, HEIC, HEIF, WebP, AVIF, TIFF, BMP and GIF all work. The result is saved as JPEG because portals expect it, and any see-through PNG background is filled with white first so the ink does not land on black.
Does it also set the pixel dimensions?
Only when you choose a form preset that carries verified dimensions, such as the 140 × 60 pixels IBPS asks for. Where published figures conflict, the tool sets the KB range and leaves the dimensions alone rather than guessing.
