The signature field on an exam or bank application is a narrow strip, much wider than it is tall, and the portal checks the file twice: once for its width and height, once for its weight in kilobytes. A phone picture of your signature is the opposite shape, an upright sheet of paper thousands of pixels across with the ink in a small patch near the middle. Scaling that picture down as it stands gives a tiny portrait-shaped image that matches neither the box nor the rules.
Here the pixel boxes already read 140 and 60, and “Crop to fill” is switched on, so the picture is trimmed evenly to a 7:3 strip before it is scaled. That only works when the ink sits near the centre of what you load, which is why the steps below begin with a close crop. For notices that measure the signature in centimetres, tap cm and type their figures instead.
Before and after
2400 × 3584 px616 KBJPG
140 × 60 px4.1 KBJPG
The dashed frame on the left marks the part that fits the new shape. It was scaled to exactly 140 × 60 px, and the top and bottom outside the frame were trimmed.
The file went from 616 KB to 4.1 KB.
The image on the right is the actual file the tool above produced.
How to use it
- Sign in black ink on plain white paper, photograph or scan it straight on, then crop close around the strokes with the crop tool, leaving a thin band of white paper on every side.
- Load that cropped picture here. Keep 140 × 60 px for a bank-style field, or switch the unit to cm, enter the width and height from your notice and set a DPI.
- Press Resize and look along the edges of the preview. If the first or last letter has been clipped, the earlier crop was off-centre or too tight; crop again with more paper at the sides.
- Read the kilobytes on the result card before uploading. If the figure is below your form’s floor, or the file came out as PNG, see the second section below.
Signature strips in recent recruitment notices
Banking notices give pixels. The Institute of Banking Personnel Selection (IBPS) asks for 140 x 60 pixels (preferred), JPG/JPEG, from 10 KB up to 20 KB in its 2025 PO/MT, Customer Service Associate and Specialist Officer notices and the RRB notice that followed. State Bank of India (PO and Junior Associates 2025), the RBI Services Board and NABARD print the same figures. All of them add that you should sign on white paper with a black ink pen, and a signature written in capital letters is refused: that is a rule about the handwriting, so no resizer can fix it.
The Staff Selection Commission gives centimetres instead: its notices for CGL, CHSL, Junior Engineer and other 2026 exams ask for a scanned signature of about 6.0 cm (width) x 2.0 cm (height), JPEG/JPG, 10 KB to 20 KB, and warn that blurred or miniature signatures are rejected. No DPI is named. The strip is 3:1, a touch wider than the 7:3 bank strip; at 150 DPI it is 354 × 118 pixels. Several signature tools list 140 × 60 pixels for SSC too, but the SSC notices themselves never mention pixels.
When the strip is too light, or saved as PNG
A 140 × 60 strip holds just 8,400 pixels, and dark strokes on white paper cost very little to store, so the resized JPG often weighs well under 10 KB. A field with a 10 KB floor bounces that file even though its dimensions are spot on. Open the 20KB compressor, tick “My form also has a minimum size”, enter 10 and add the strip: it raises the JPG quality first and, only if that falls short, enlarges the picture as little as possible while keeping the 7:3 shape. The notices call 140 × 60 a preferred size, while the KB band is stated as a limit.
Resizing keeps the format you gave it. A JPG comes back as JPG and a PNG as PNG; anything else, an iPhone HEIC for instance, is saved as JPG. Bank and SSC signature fields take JPG/JPEG only, so a signature exported as PNG from a scanner or notes app should go through the PNG to JPG converter before upload. Camera details stored in a phone photo, location included, do not carry over into the resized file.
Frequently asked questions
- Why do the letters of my signature look squashed?
- “Stretch” was chosen, which forces the picture into 140 × 60 whatever its shape, so a tall photo gets flattened. Select “Crop to fill” again: the extra paper above and below the ink is trimmed away and the strokes keep their real proportions.
- Part of my name was cut off. How do I stop that?
- “Crop to fill” always trims from the centre outwards. If the signature sat to one side of the photo, or the photo showed a whole page, the trim reaches the ink. Crop the picture loosely around the signature first, roughly twice as wide as it is tall, and resize that.
- Should I use 140 × 60 pixels for an SSC form?
- The SSC notices describe the signature as about 6.0 cm wide by 2.0 cm high and give no pixel size. Tap cm, enter 6 and 2, and pick a DPI such as 150 or 200; the DPI you choose is written into the file. Then check the weight on the result card against the 10 KB to 20 KB band.
- Will the resized signature be 20 KB or less?
- At 140 × 60 pixels it usually is, often by a wide margin, but this page sets dimensions, not weight, so read the figure on the result card. If it is over 20 KB, or under a 10 KB floor, pass the file through the 20KB compressor with the limits from your form.
- My signature is faint and grey. Will resizing make it darker?
- No. This tool changes the size only; it does not adjust brightness or contrast. Sign again with a black pen pressed firmly, photograph it in daylight without your shadow over the paper, and resize the new picture.
- Can I resize my photo and signature in one go?
- Not on this page; it handles one picture at a time with one set of dimensions. Resize the signature here and the photo with its own size. If a form wants both on a single image, the merge photo and signature tool joins them once each is ready.