Resize a Signature for Online Applications
SSC, IBPS, PAN/NSDL and other Indian government portals reject signature uploads that miss an exact pixel size and a tight KB window. Crop out the paper margin, pick your portal, and download a file built to spec — entirely in your browser.
Drop a signature photo here or click to browse
JPEG or PNG — a phone photo or scan of your signature on white paper
140×60px, 10–20 KB — SSC exam signature spec (4×2cm, black ink on white)
Why do portals reject signature uploads?
These forms run on legacy systems that expect an exact match on two axes at once: the right pixel width and height, and a file size inside a narrow KB window. A signature photographed on paper usually comes out far larger on both counts, so it bounces with errors like “invalid dimensions” or “file size exceeds limit.”
A generic crop-and-save in your phone's photo app rarely lands inside both constraints together. This tool crops tightly to the signature itself, resizes to the exact pixel box your portal expects, flattens it onto white, and then binary-searches the JPEG quality that fits your KB window — all without ever leaving your device.
Signature specs by portal
| Portal / form | Pixel size | KB window | Notes |
|---|---|---|---|
| SSC (CGL, CHSL, MTS, GD, etc.) | 140×60 px | 10–20 KB | 4×2cm, JPEG, black ink on white |
| IBPS (PO, Clerk, SO, RRB) | 140×60 px | 10–20 KB | Same spec as SSC |
| PAN card / NSDL (Protean) e-Sign | 354×157 px | 10–50 KB | ~4.5×2cm at 200 DPI |
| UPSC (CSE and other exams) | Not fixed — check your DAF | ~20–100 KB | Sign 3× vertically on one white sheet; pixel size varies by notification |
| Passport Seva (Indian passport) | Not fixed — tight crop | ≤ 100 KB | Signature upload is mandatory since the GPSP 2.0 migration; no exact pixel box is enforced |
Specs change between recruitment cycles — always check your form's current instructions before submitting. Rows without a fixed pixel size are shown that way on purpose: set the KB window here and crop to a sensible size by eye.
How to resize a signature
- Sign your name on plain white paper with black ink (blue is sometimes accepted — check your form first).
- Photograph or scan it in good, even light so the paper reads as white, not gray.
- Drop the photo into the tool above.
- Drag over the image to crop tightly around just the signature strokes, cutting away the paper margin.
- Pick your portal's preset, or type a custom width, height and KB window.
- Download the JPEG — it's already named
signature-<width>x<height>.jpg.
Most of these portals also want a separate photograph upload at its own pixel/KB spec. Use the Compress Image to KB tool for that, or the free passport photo editor if you also need a compliant passport-style photo.
Signature resizing — FAQ
How do I resize my signature to 20 KB?
Upload your signature photo above, drag over the image to crop out just the signature (cutting away the paper margin), then click the SSC/IBPS preset — it sets 140×60px, 10–20 KB in one click — or type "20" into the max-KB box yourself. Download the JPEG when it is done; the tool binary-searches the JPEG quality that lands inside your KB window without changing the pixel dimensions.
What size does SSC want for a signature upload?
SSC exams (CGL, CHSL, MTS, GD Constable and others) ask for a signature scanned at 140×60 pixels, 10–20 KB, JPEG format, signed in black ink on plain white paper. IBPS bank exams (PO, Clerk, SO, RRB) use the identical 140×60px, 10–20 KB spec. Both are covered by the same preset in the tool above — but always confirm on the current notification, since exam bodies occasionally tweak requirements between recruitment cycles.
Why does the tool put a white background behind my signature?
JPEG has no transparency channel, so a photo with a translucent or off-white background can render as gray or black once a strict portal validator reads it. Flattening onto pure white first avoids that, and matches what every portal expects: dark ink strokes on a clean white field.
Is my signature photo uploaded to a server?
No. Cropping, resizing and compression all run on your device using the browser canvas — nothing is sent anywhere, ever. That is true of every tool on this site: no accounts, no storage, no upload, even for the final download step.
What if my resized file is still too small or too big for the portal?
Landing under your chosen minimum is usually fine — most portals enforce a hard maximum but only a soft guideline minimum, and the tool flags it when this happens. If it cannot get under your maximum at the pixel dimensions you set, try cropping tighter around just the ink strokes (less visual detail compresses further), simplifying the background, or nudging the max-KB value up slightly.
Do UPSC and Passport Seva use the same fixed pixel size?
Not as strictly. UPSC’s current guidance asks for a signature JPEG roughly 20–100 KB without one universal fixed pixel box — it has varied by notification, so set the KB window here and check the current Detailed Application Form for exact dimensions. Passport Seva’s GPSP 2.0 portal now requires a signature upload (JPEG, tightly cropped, under 100 KB) but likewise does not mandate an exact pixel size — just crop close to the ink and stay under the cap.