C4ConverterPDF Tools
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Make a scanned PDF searchable

Use English OCR to add selectable, searchable text while retaining the scanned page image.

English PDF OCR · 25 MB maximum · up to 30 pages

English recognition only. Long scans can take more than a minute; handwriting, unusual fonts and low-resolution pages may be inaccurate.

Instructions

How to use OCR PDF

  1. Choose a scanned PDF and pages to process.
  2. Select an OCR quality preset and whether to skip text pages.
  3. Run OCR and download the searchable PDF.

Common uses

  • Search an English scanned report.
  • Prepare a scan for text extraction or PDF-to-Word conversion.

Known limitations

  • Handwriting, unusual fonts, low-resolution scans and complex tables may be inaccurate.
  • Non-English documents are not supported in this release.

Troubleshooting

Recognition is inaccurate

Use a clearer scan and the detailed quality preset; deskew the source if it is rotated.

OCR PDF FAQ

Which language is supported?

This release uses the English Tesseract language model.

Will OCR change the page appearance?

The original scanned page remains visible while recognized words are added as an invisible text layer.

Last reviewed: