Glossary
Short explanations of document-processing and privacy terms: OCR, text layer, in-place correction, redaction, PDF metadata, SHA-256, read-back verification and the operation record.
In-place correction
Erase only the target strokes on a scan and write new text matching the original ink color, blur and slant. Other pixels stay as they are; no page re-layout.
Learn more →OCR
OCR turns text in an image into text and positions a program can work with. Text on scans and photos can only be found, replaced or redacted after OCR.
Learn more →Operation record
A JSON file EnjoyPDF writes next to each output: SHA-256 of input and output, counts, check results, risk decision and version. No replaced or deleted text.
Learn more →PDF metadata
Information about the PDF file itself, such as title, author, creating software and dates, kept in the document information dictionary and XMP.
Learn more →Read-back verification
After saving, each replacement is read again from the output file and compared with the intended text. Results: passed, needs review or failed.
Learn more →Redaction
Permanently removing sensitive information so it cannot be viewed, copied, searched or recovered. Unlike masking, it deletes the underlying content.
Learn more →SHA-256
A hash algorithm that turns any file into a 64-character fingerprint. Change one byte and the value changes completely. Used to check downloads and deliveries.
Learn more →Text layer
The text in a PDF that you can select, copy and search. In a scan the visible text is an image, sometimes with invisible OCR text beneath it.
Learn more →Try it first with your own file
After downloading, open a scan, enter a keyword and click "Find". Finding, replacing and saving need no network connection.