Page Content Stream
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Definition
Section titled “Definition”A PDF page is not a picture; it is a content stream — a sequence of operators that instruct the reader how to draw the page: place this text here with this font, stroke this path there, position this image at this rectangle. The reader executes the stream to render the page. Because the stream is a program rather than a bitmap, its text can be selected and searched, and the same page can be drawn at any scale.
Example
Section titled “Example”A page of a report and a scan of the same page. The report’s page is a content stream, so the text can be selected, copied, and searched. The scan is a single image with no stream, so the same page shows the same words but offers none of the interaction. Converting the scan requires OCR to build something resembling a stream’s text.
In the PDFLean tools
Section titled “In the PDFLean tools”- compress a PDF — packs content streams without altering what they draw
- inspect a PDF file — reports whether a page carries a text layer at all
Related reading
Section titled “Related reading”- Raster and Vector — the two ways a page’s appearance can be carried
- Cross-Reference Table — how the reader finds each page’s stream
- Compress a PDF Without Uploading It — the rebuild that repacks content streams