PDF OCR
Recognize printed text in scanned PDF pages and extract it as editable text directly in your browser.
Turn a scanned PDF into searchable text
Scanned PDFs are often just page images. A normal PDF text extractor cannot read characters that do not exist in the document’s text layer. OCR solves that gap by looking at the rendered page image and recognizing printed characters.
How to OCR a PDF
- Choose a scanned or image-only PDF.
- Optionally enter the pages you want, such as
1-3,5, or leave the field empty for the whole document. - Start OCR and wait while each selected page is rendered and recognized.
- Review the extracted text, then download the TXT file.
When OCR is useful
OCR can make old reports, scanned invoices, receipts, forms, printed letters and archived paperwork easier to search or copy. It is also useful when a PDF looks like text to a person but has no selectable text underneath the image.
Scan quality controls accuracy
OCR is not a guarantee of perfect transcription. Blurry pages, skewed scans, shadows, low contrast, compressed images, decorative fonts and very small characters can produce substitutions or missing words. Tables and columns can also be read in an order that differs from the visual layout.
Why review OCR output
Always compare important names, numbers, dates, addresses and totals against the original scan. OCR output is an extraction result, not a proof that every character was recognized correctly. For financial, legal or archival material, manual verification is especially important.
PDF OCR versus PDF to Text
PDF to Text reads an existing text layer. PDF OCR is for pages where the information is primarily stored as an image. If your PDF already lets you select and copy words, ordinary extraction is usually faster and avoids unnecessary recognition.
Browser-based privacy
NeroTool renders the selected pages in the browser and runs the OCR engine locally. The document is not intentionally uploaded to a NeroTool processing server. The OCR engine and language data may be loaded from third-party CDN resources, so the browser still needs network access the first time those assets are loaded.
Frequently asked questions
What is PDF OCR?
OCR, or optical character recognition, turns characters visible in scanned PDF page images into searchable and selectable text.
Can OCR read handwriting?
This browser workflow is intended for printed text. Handwriting, very small text, unusual fonts and poor scans can produce unreliable recognition.
Is OCR performed on my PDF locally?
The PDF pages are rendered and sent to the OCR engine running in your browser. The selected PDF is not intentionally uploaded to a NeroTool processing server.
Which languages are supported?
The current NeroTool workflow provides English OCR. Additional language models can be added later if they are needed, but they should be tested for accuracy and browser performance first.