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OCR PDF Online

Run optical character recognition on supported scanned or image-based PDF pages to make recognized text searchable. OCR results depend on language support, scan quality, resolution, rotation, and document layout.

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Up to 50 MiB per PDF

English OCR · up to 25 pages

ファイルはブラウザー内に残ります ファイルのアップロードなし アカウント不要

How to Make a Scanned PDF Searchable

  1. Choose a supported scanned or image-based PDF.
  2. Start OCR processing.
  3. Download the OCR-processed PDF.
  4. Open the downloaded PDF and test important names, numbers, or terms.

Browser processing questions

What is OCR?

Optical character recognition analyzes page images and attempts to identify characters so recognized text can become searchable or extractable.

Which languages does PDFKaka OCR support?

PDFKaka OCR currently supports English printed text.

Can OCR read handwriting?

The current OCR workflow is intended for printed English text, not handwriting.

Will OCR be completely accurate?

No. Accuracy depends on scan quality, resolution, rotation, language, fonts, layout, and the content itself. Review important text manually.

Does OCR change the visible scan?

OCR rebuilds each page as a JPEG image and adds a searchable text layer. The original page image bytes are not preserved unchanged.

ファイルはPDFKakaへアップロードされますか？

No. Selected PDF contents are processed locally in this browser; OCR assets are loaded from PDFKaka only when recognition starts.

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Turn image-only scans into searchable PDFs where recognition succeeds

OCR PDF is useful when a scan contains printed text but no selectable text layer. It does not guarantee perfect recognition or recreate every layout as editable document content.

こんな用途に

  • Search printed text inside supported scanned documents.
  • Copy recognized text where the OCR result is accurate enough.
  • Prepare a scanned PDF for workflows that benefit from searchable text.

知っておきたいこと

  • The OCR engine currently recognizes English only.
  • The current workflow is intended for printed text, not handwriting.
  • OCR accuracy depends heavily on scan quality, orientation, contrast, and typography.
Practical guidance

Use OCR to make scanned PDF text searchable

OCR PDF is for pages that look like text but behave like images. It recognizes printed English characters in scanned pages and adds a searchable text layer locally. The result can support searching and copying, but OCR is best-effort and important values must always be checked.

Convert a scanned PDF into searchable PDF

Each page is rendered for recognition and the detected English text is added to a new PDF. This can make image-only scans easier to search and reuse.

Prepare OCR text for Word or TXT workflows

After OCR, use PDF to Text or PDF to Word when reusable text is the main goal. Complex layouts, columns, and tables can still require manual correction.

Improve OCR accuracy before processing

Straight pages, clear printed characters, good contrast, and adequate resolution help recognition. Handwriting, shadows, curved pages, and blurred photographs reduce accuracy.

Questions people ask about this task

Can I OCR a PDF online for free?

Yes. The current tool recognizes supported printed English text locally without requiring an account.

Does OCR PDF convert directly to Word?

OCR creates a searchable PDF. Open that result in PDF to Word when an editable DOCX file is also needed.

Can OCR read handwriting or every language?

No. The current workflow is designed for printed English text. Handwriting and other languages are not reliable supported inputs.