Signature resizerの使い方
- 1
Sign and photograph it
Sign in black ink on plain white paper, then take a flat, well-lit photo with your phone or scan the page.
- 2
Choose the form's size
Pick a preset such as SBI or IBPS (140 × 60 px, 10–20 KB), SSC (about 6.0 × 2.0 cm, 10–20 KB), UPSC's triple signature or Teletalk (300 × 80 px, up to 60 KB), or enter your own.
- 3
Clean it up
Move the background threshold until the paper is pure white without losing thin strokes, choose black or the pen's own colour, and keep trim on.
- 4
Download the signature
When the checklist is green, save the JPEG, named like signature-140x60.jpg, and upload it in the form's signature field.
制限と Pro
Free: one signature at a time from a source image up to 25 MB; JPEG output only.
Pro takes signature scans and photos of up to 4 GB. Pro を見る
Signature resizer について
A signature upload fails for different reasons than a photo: the file is grey and shadowed because it was photographed on a desk, the ink is too faint to see at 140 × 60 pixels, or a plain white image is so small that it can't reach the form's 10 KB minimum. This page is built for those cases.
The clean-up works out the paper's brightness across the picture, so a shadow from your phone or uneven lamp light counts as paper, not ink. Everything lighter than the threshold becomes pure white; darker strokes are deepened to black or keep the pen's own colour, with soft edges so the signature doesn't look jagged when it is scaled down. Trim then finds the ink, cuts away the empty paper with a small margin, and centres the signature in the exact box the form wants. Bolder strokes thickens hairline signatures that would otherwise fade at 140 × 60 px. A live preview shows the cleaned signature while you move the slider.
The file is a baseline JPEG at the preset's pixels, searched for the best quality inside the KB range. For SSC, which gives a physical size, the file is 472 × 157 pixels with 200 DPI written in, which is 6.0 × 2.0 cm. UPSC's form wants three signatures, one below the other, in a picture 350 to 500 pixels on each side, named signature.jpg.
Very small, clean signatures can still fall below a minimum even at the highest quality; the page tells you rather than padding the file. It doesn't create a signature for you or verify that it matches your ID.
プライバシー
The signature photo is processed in this browser tab: the clean-up is plain JavaScript on the pixels, the resize uses the pica library and the size search runs MozJPEG in a Web Worker. Nothing is uploaded, which matters for an image of your signature. Your clean-up settings and chosen preset are kept in local storage; the picture itself is not saved anywhere.