Fix Signature to Black
Convert blue or red ink signatures to pure black as required by most government portals.
Portal requirement
Most portals require black ink signatures. This tool converts blue, red, or any coloured signature to pure black on white.
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Why Convert Signature to Black?
Many government exam portals (UPSC, SSC, IBPS, etc.) explicitly require signatures in black ink. If you signed in blue or red, your application photo may be rejected at the verification stage.
How does the sensitivity slider work?
The slider controls how dark a pixel must be to count as "ink". At low values, only the darkest pixels are converted to black — good for bold signatures. At higher values, lighter strokes are also captured — useful for faint or gel-pen signatures.
Is my signature secure?
Yes. All processing happens entirely in your browser. Your image is never uploaded to any server.