Compress signature to 20 KB
Files never leave your deviceDrop a photo or scan of a signature and download a file at or under 20,000 bytes (20 KB). The page crops the blank margin, keeps thin pen strokes dark, and shows the exact byte size before you download. It all runs in this tab.
Blank margins removed. The long side stays at 1,200 px or less. 1 KB is 1,000 bytes, so 20 KB means 20,000 bytes.
How to use it
- Choose 20 KB, or switch to 10 KB or 50 KB. Pick Smart gray for a pen stroke, and a size box if the form names one.
- Drop the signature. Blank paper around the ink is removed, then the image is compressed to the highest quality that fits.
- Read the exact byte count. Download the file when it is inside the limit.
Details
- Target
- At or under 20,000 bytes by default. Also 10,000 or 50,000, or a custom limit. 1 KB = 1,000 bytes
- Crop
- Blank or near-white paper around the ink is removed. A dark table is not blank paper, so it stays
- Strokes
- Smart gray stretches the ink darker. Threshold snaps it to black and white. Color keeps the photo
- Boxes
- Cropped, 140×60 px, 472×157 px (6×2 cm at 200 dpi), 709×236 px (6×2 cm at 300 dpi), or 400×500 px
- Floor
- Optional. A JPG under 10,000 bytes can gain faint grain in the blank paper only, so it clears a 10 KB minimum
- Check
- The result states the exact byte count and whether it is inside the limit
Questions
Are my files uploaded?
No. The page loads its code once, then reads and processes your files inside the browser tab. Nothing is sent to a server; you can confirm it in your browser's network panel while a file converts.
Will a thin pen stroke disappear?
Smart gray is the default because it maps the darkest ink to black and the paper to white, and shrinking keeps the darkest pixel in each block. Threshold is crisper and smaller, and it can drop a stroke that is only a faint gray. Color keeps the photo, including shadows, and uses more of the byte budget on the background.
What size do exam and government forms ask for?
Check the current notice; these are the published figures this page's boxes are built from. SSC CGL 2025 asks for a JPEG signature of 10 to 20 KB at about 6.0 cm by 2.0 cm. IBPS asks for a JPG of 140×60 px, between 10 and 20 KB, in black ink on white paper. UPSC asks for a JPG of 20 to 100 KB with dimensions of 350 to 500 px, and three signatures stacked. Pick 50 KB or a custom target when the cap is above 20 KB.
Does 20 KB mean 20,000 or 20,480 bytes?
20,000 bytes. The same rule as the other compressors: 1 KB is 1,000 bytes, so the file also passes a form that uses 1,024. The result line shows the exact count.
The form wants between 10 KB and 20 KB, and my file is under 10 KB.
Leave Keep at least 10 KB on. If the clean JPG is under 10,000 bytes, the page adds faint grain to the blank paper until the file is inside 10,000–20,000 bytes, without changing the ink. A very small box such as 140×60 can still land under 10,000 bytes; the result says so. PNG is often smaller still, so use JPG when the form has a minimum.
Why is there still white space?
A fixed box such as 140×60 is filled with white and the signature is fitted inside it without stretching, because those forms check the pixel size. Choose Cropped if you only want the ink and a small margin.