Image-Only 'Scanned' PDF (OCR twin)
An image-only PDF containing a rasterised 'scan' of the simple document, with no text layer. Paired with the text version so you can score OCR output against a known ground truth.
Rendered preview of the pdf file (2.6 MB). Download above for the original.
Specifications
- Pages
- 1
- Has Text
- false
- Content
- rasterised image only
- Paired With
- doc-pdf-simple
What is a .pdf file?
PDF (Portable Document Format) is a page-oriented format that fixes layout, fonts, and vector and raster graphics so a page renders identically anywhere. A `%PDF-` header is followed by numbered objects, a cross-reference table mapping each to a byte offset, and a trailer; edits append incremental updates rather than rewrite the file. Page content is a stream of drawing operators, so a PDF holds no words or paragraphs, only positioned glyph runs. Adobe released it in 1993 and gave it to ISO as ISO 32000-1 in 2008.
How to use this file
Use an example PDF to test text extraction, rendering, metadata parsing, AcroForm handling, and OCR pipelines — checking that extraction reconstructs reading order from glyph positions, that a scanned page yields no text, and that an incremental update leaves earlier revisions in the file.
How to use this file for testing
“Image-Only 'Scanned' PDF (OCR twin)” is a deterministic Novus Examples fixture for PDF editor testing, OCR testing. Form PDFs, bookmarked documents, scanned pairs, and deliberately corrupt files for exercising PDF editors, parsers, and fillers.
Documented properties for this file: 1 pages. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
Document fixtures list their internal structure (pages, fields, tracked changes, embedded objects) in the spec table. Test extractors, converters, and OCR against that known structure, and compare searchable↔scanned or format-twin companions when present.
Code examples
import pdfplumber # pip install pdfplumber
with pdfplumber.open("scanned-ocr-twin.pdf") as pdf:
print(len(pdf.pages), "pages")
print(pdf.pages[0].extract_text())Related files
- pdfStore Receipt — Scanned (image-only PDF)The same café receipt as an image-only 'scan' — no text layer, with a slight rotation and grain so it reads like a photographed receipt. Paired with the searchable version as OCR ground truth.
- pdfStore Receipt — Searchable PDFA realistic café receipt as a searchable PDF with a real text layer — the OCR ground truth paired with an image-only scanned twin, so you can score OCR output against known text.
- pdfAirline Boarding Pass (PDF)An airline boarding pass laid out as a landscape PDF — passenger, flight, gate, seat, PNR, and a decorative barcode strip. A fixture for testing document-layout parsing and field extraction. Synthetic; the barcode is decorative.
- pdfOCR Domain — Handwritten-print Form (Searchable PDF)A searchable PDF handwritten-print form with selectable text — the OCR ground-truth twin of the scanned JPEG. Fictional SAMPLE content for measuring OCR accuracy.
- pdfOCR Domain — ID Card Mock (Searchable PDF)A searchable PDF id card mock with selectable text — the OCR ground-truth twin of the scanned JPEG. Fictional SAMPLE content for measuring OCR accuracy.
- pdfOCR Domain — Invoice (Searchable PDF)A searchable PDF invoice with selectable text — the OCR ground-truth twin of the scanned JPEG. Fictional SAMPLE content for measuring OCR accuracy.
Generated by generation/docs_pdf.py. Free for any use, no attribution required — license.