Signatures for digital forms
Compress Signature to 10 KB
Preset and ready: drop a file and the output lands under 10 KB as JPEG — processed entirely in your browser.
Drop your image here or browse
JPEG, PNG, WebP — everything stays on your device
Why this exact limit matters
Ten kilobytes is the floor of the standard Indian signature rule: IBPS and SSC exams accept scanned signatures between 10 KB and 20 KB, so 9.9 KB passes and 9 KB fails. Signatures are the easiest files in this whole site to compress — black ink on white paper is line art, and line art shrinks dramatically before anyone notices anything.
A signature is high-contrast line art, which compresses extremely well — hitting a small kilobyte target normally costs almost nothing in legibility. 10 KB is one of the tightest limits you will meet online, and this page is preset to exactly that ceiling.
How to compress to 10 KB
- Drop your signature scan into the box above — it stays on your device.
- Confirm the target: under 10 KB as JPEG.
- The MozJPEG encoder searches its quality range so the JPEG output lands just under your limit. Dimensions are left at their original size unless the target demands otherwise.
- Preview the result, compare it with the original if you want, and download — the filename carries its actual size.
Tip: If your scan has a grey or shaded background, the encoder spends bytes on that noise. A clean white background is the single biggest size saver for signature files.
Measured: a real signature-style scan under 10 KB
We generated a signature-style test file — 1600×700, dark strokes on plain white, 22.4 KB as saved by a photo editor — and gave it a 10 KB ceiling:
Source file
22.4 KB
1600×700 JPEG
Output
9.8 KB
2.3× smaller
Quality setting
q50
mid-range
Resolution
1600×700
unchanged
Quality 50 on line art still looks clean — strokes stay solid because there is almost nothing in the image to distort. That is the signature pattern in general: budgets that are brutal for photos are routine here. Crop tightly, keep the background white, and 10 KB is enough.
Signature rules that mention 10 KB
| Form | Photo size rule | Dimensions | Format |
|---|---|---|---|
| IBPS PO & Clerk → | 10–20 KB — 10 is the floor | 140×60 px | JPG |
| SSC CGL | 10–20 KB | 236×79 px | JPG |
| SSC CHSL | 10–20 KB | 200×80 px | JPG |
| UPSC (for contrast) | 20–100 KB — 10 KB is below its floor and fails | 350–500 px wide | JPG |
From the 2025–26 cycles. Note the one trap: UPSC’s signature floor is 20 KB, so a 10 KB signature that satisfies IBPS perfectly will fail UPSC. Match the page to your form.
Frequently asked questions
My scan is 3 MB — will it really reach under 10 KB?
If it is a clean black-on-white scan, yes comfortably; if it is a dim photo of paper with grey shadows, those shadows eat the budget. Brighten and crop before compressing and the same 10 KB looks far better.
Should my signature be PNG since it is line art?
PNG suits line art on principle, but the forms in the table require JPG — and their KB bands are sized for it. Use JPEG here; if you need PNG for another destination, the tool optimizes it losslessly too.
How do I get the signature file in the first place?
Sign with black ink on white paper, photograph or scan it in even light, crop to just the signature with a small margin, then bring it here. Everything outside the strokes is wasted bytes.
Should my signature be PNG or JPEG?
JPEG is accepted by virtually every form and reaches very small sizes on line art. If you need PNG specifically, this tool optimizes it losslessly and offers a JPEG alternative when the lossless result cannot fit your limit.
Why JPEG and not another format for my upload?
JPEG is the most universally accepted image format on upload forms and gives the smallest files for photographs. If your destination accepts only "images", JPEG is the safe choice.
Do I need an account or app install?
No account, no install, no watermark. The page you are on is the whole tool.