Spectra PDF

Free open-source PDF workbench for Windows with 20+ tools including signatures, OCR, redaction.

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Spectra PDF is a free, open-source PDF editing workbench for Windows offering more than 20 tools for reading, annotating, organizing, signing, OCR-scanning, and redacting documents. It runs entirely on the user's machine with no ads or telemetry, aimed at Windows users who want a full-featured PDF editor without paid software.

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