PDF Ink Color to Black Converter
Convert colored ink (blue, red) to black in PDF documents. Normalize ink colors.
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Maximum file size: 10MB
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What is This Tool?
Convert colored ink (blue, red) to black in PDF documents online for free. This tool changes all pen writing to uniform black color while preserving stroke thickness. Perfect for creating consistent mono-color documents.
PDFs with blue pen or red pen writing look inconsistent. Mixed ink colors reduce professional appearance. Our tool detects colored ink regions, replaces with black, and keeps thickness preserved for uniform appearance.
How to Use
Upload PDF - Upload PDF with colored ink writing. Processing in browser.
Select Conversion - Choose: Blue → Black or Red → Black. Adjust Conversion Strength.
Process & Download - Tool detects colored ink, replaces with black, preserves thickness, downloads uniform PDF.
Frequently Asked Questions
Can this convert multiple colors?
Yes! Converts blue and red ink to black. Can process both in one operation.
Will printed text be affected?
No. Tool targets only handwritten ink strokes, not printed text.
Does this preserve stroke thickness?
Yes! Original pen stroke width is maintained after color conversion.
Is my data secure?
Yes. All processing in browser.
Can I adjust conversion strength?
Yes. Conversion Strength slider controls color replacement intensity.
What's the file size limit?
Supports PDFs up to 10MB.