GroupDocs.Redaction
7.6#1 in document redaction software$1,999 usage-basedAndroidiOSWebAPI
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It suits developers or organizations that need to redact documents on-premises across varied file formats. The browser app may suit users seeking a web-based option.
PDFRedaction is aimed at legal, healthcare, government and financial organizations handling sensitive or regulated information. It may suit users who need local document processing and permanent PDF redaction.