OCR quality is bounded by the information in the page image. Software can correct moderate skew and contrast, but it cannot reliably reconstruct characters lost to blur, glare or heavy compression.

Resolution, language selection and page preparation work together; increasing only one is not a complete fix.

Capture enough real detail

Aim for a sharp document scan with small characters clearly separated. Excessive resolution creates large files without restoring detail, while low resolution merges letter strokes.

Match the recognition language

The correct language improves word and character expectations. Mixed-language documents, unusual names and codes still require manual review.

  • Straighten page baselines.
  • Remove shadows behind text.
  • Keep black text distinct from the background.

Measure accuracy on important fields

Search several distinctive phrases, copy representative paragraphs and compare dates, totals and identifiers character by character. Do not judge success from one easy heading.