Resize a signature for an online form
Online forms want a signature as a small JPG: so many pixels wide and high, and between two file sizes. Add a photo of your signature, crop it, and set both.
- Runs in your browser
- Nothing is uploaded
- No sign-up
- No watermark
Drag & drop your image here
or tap to browse · you can also paste from the clipboard
JPG · PNG · WebP · GIF · BMP · AVIF · SVG · up to 50 MB each
Choose an imageBefore
Result
Processed image will appear here.
How to use the signature resizer
Add a photo or scan of your signature, drag the crop box around it and set the pixel size and file-size range your form states. The defaults are 140 × 60 pixels and 10 to 20 KB. The download is a JPG that meets both.
- Add a photo or scan of your signatureBlack ink on plain white paper gives the cleanest result.
- Crop close and set the size140 × 60 pixels and 10 to 20 KB are filled in. Type your form's numbers if they differ.
- Download the JPGThe result confirms the pixel size and whether the file is inside the range.
About this tool
A signature upload has two separate rules, and a file can pass one and fail the other. The first is the pixel size, such as the 140 × 60 pixels that bank recruitment forms run through IBPS prefer. The second is the file size, 10 to 20 KB on those same forms. A photo of a signature straight from a phone fails both: it is thousands of pixels across and several megabytes.
This page deals with both rules in one pass. You drag a crop box, which keeps the shape of the output, around the signature. The picture is resized to the exact pixels and saved as a JPG at the quality that puts the file inside the range. If a clean signature on white paper comes out below the minimum, which is common because blank paper compresses so well, the file is topped up to the minimum without altering the picture.
What you get
- Exact pixel size, starting at 140 × 60
- File size between a minimum and a maximum you set
- Crop box that keeps the output shape
- Tops a too-small file up to the minimum
- JPG output, the format application forms accept
When to use the signature resizer
Bank and insurance recruitment forms
Applications run through IBPS ask for a signature of 140 × 60 pixels, preferred, in a file between 10 KB and 20 KB.
University and entrance exam applications
Admission portals set their own pixel size and range for the signature; both go into the fields on this page.
Government service portals
Licence, certificate and scholarship portals take a small signature image alongside the applicant's photo.
A signature for documents and email
A tightly cropped signature at a known pixel size drops cleanly into a letter, a PDF form or an email footer.
Reading the signature rules on a form
| Rule on the form | What to set here | Why it matters |
|---|---|---|
| A pixel size, such as 140 × 60 | Width and height | A file with the wrong pixel size is refused before anyone looks at it |
| A maximum file size | Largest file size allowed | The quality is lowered until the file fits |
| A minimum file size | Smallest file size allowed | A clean signature is often too small and has to be topped up |
| JPG or JPEG only | Nothing: the output is always JPG | PNG and PDF signatures are refused by most forms |
How it works
A signature is an unusual image: a few dark strokes on a field of one colour. JPG stores the flat field in almost no space and spends its bytes on the edges of the strokes, so the file size depends far more on how clean the paper looks than on the pixel count. The same signature can make a file two or three times larger on a shadowed, textured sheet than on pure white.
That is why a minimum file size catches people out. When the best-quality JPG is still under the minimum, there is nothing left to gain from the encoder, and this page adds filler bytes in a comment segment, a part of the JPG format meant for notes, until the file reaches the minimum. Image viewers and upload checks read the picture exactly as before. The maximum is handled the opposite way, by lowering quality step by step until the file fits.
Common problems and how to fix them
- The signature is unreadable at 140 × 60
- That is very few pixels. Crop tightly so the signature fills the box, and sign with a thicker pen. If your form allows a larger size, use it.
- The background came out grey
- The photo was taken in dim or uneven light. Retake it by a window on bright white paper. This page does not whiten paper.
- The form says the file is too small
- Enter the form's minimum in the smallest-size box. The file is then brought up to it. The result note says how much filler was added.
- The shape of the box does not suit my signature
- The box follows the width and height you set. A long signature suits a wide box such as 450 × 150; change the size only if your form permits it.
Frequently asked questions
How do I resize a signature to 140 × 60 pixels?
Add the image above. 140 × 60 is already filled in, so drag the crop box around the signature and download. The result is exactly 140 pixels wide and 60 high.
How do I make a signature between 10 KB and 20 KB?
Those limits are the defaults here. The JPG quality is searched for the highest setting that stays under 20 KB, and if the file is still below 10 KB it is brought up to 10 KB. The result note tells you the final size.
Should I sign in blue or black ink?
Black, unless your form says otherwise. Most recruitment notices ask for black ink on white paper, and black gives the strongest contrast after compression. A few forms reject signatures in capital letters, so sign the way you normally do.
Does it remove the paper background?
No. The page crops, resizes and compresses; it does not whiten the paper or remove shadows. Photograph the signature in even light on white paper. For a background that is one solid colour, the Background Colour Changer can replace it.
What is the best size for a signature image?
The one your form states. Where none is given, 300 × 100 pixels is a reasonable choice: wide enough to stay legible and small enough for a file of a few kilobytes.
Can I resize a signature in centimetres instead?
Yes, on the pages built for it: 6 × 2 cm and 50 × 20 mm, both of which accept other sizes too.
Is my signature uploaded anywhere?
No. The image is read and processed by your browser on your own device and is never sent to a server. That matters more for a signature than for most pictures.