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How to set your signature as black and white?

With WPS PDF, you can read, take annotation, compress, convert PDF to jpg, highlight, search, process & edit pdf documents on Windows, Mac, PC, and Android platforms.1. Open PDF files in WPS Office. 2. Click the Insert tab → Sign → Create signature. 3. Select Image in the pop-up box and upload your signature, then click Set as Black and White on the upper right corner. 4. Click OK and your signature will be set as black and white.