What the PDF OCR Tool Does and Why It Matters
The PDF OCR tool reads scanned PDFs — images of pages that contain no selectable text — and recognizes the words using the Tesseract OCR engine running in your browser. It renders each page to a canvas with PDF.js, then runs optical character recognition to produce searchable, copyable text.
This matters because a huge amount of paperwork exists only as scans: contracts, forms, old records. OCR turns those images into actual text you can search, copy, and reuse, and doing it on-device keeps sensitive scans off third-party servers.
How to Use PDF OCR (Text Recognition)
- Upload a scanned PDF.
- Let the tool render each page to an image and run Tesseract OCR.
- Wait while recognition processes the pages (this can take a while for long documents).
- Review the recognized text and correct any obvious mistakes.
- Copy or download the extracted text.
Supported Inputs and Limitations
What you provide
- A scanned or image-based PDF
- Reasonably clear, upright page images for best accuracy
What you get
- Recognized text from the scanned pages
- Copy-ready, searchable output
Known limitations
- OCR accuracy depends on scan quality — blur, skew, low resolution, and handwriting reduce it.
- Recognition is computationally heavy and can be slow for many pages, especially on modest devices.
- Always proofread the result before relying on it for anything important.
Privacy and Security
OCR runs entirely in your browser using Tesseract; the page images and recognized text stay on your device and are never uploaded to NovaTools or any external server, which makes it safe for confidential scans.
Frequently Asked Questions
What kind of PDF needs OCR?
A scanned one — where each page is an image and you cannot select the text. Digitally created PDFs already have text and only need the PDF to Text tool.
Why is OCR slow?
Recognizing characters from images is intensive work that runs locally in your browser, so processing time grows with page count and image size.
Are my scans uploaded?
No. Both rendering and recognition happen locally; nothing leaves your browser.