Source: https://mactoolbox.app/glossary/ocr

# What is OCR?

By Nikhil Barik · Published November 3, 2026

## Quick answer

OCR, or optical character recognition, reads the text in an image or scanned page and turns it into real text. It is what lets you search and copy from a scanned PDF.

## What OCR is

A scan is only a picture of a page. OCR finds the letters in that picture and produces text. Many tools then place the text as an invisible layer behind the page so it looks unchanged.

## Why it matters on a Mac

macOS has Live Text, which lets you select text in photos and screenshots in Preview and Photos. For whole scanned PDFs and batches, you need a tool that processes every page.

## How to check it on macOS

Open the PDF in Preview and try to select a word. If you can only drag a box, the page is an image with no text layer.

## How Toolbox handles it

Make PDF Searchable adds an invisible text layer to scanned PDFs. Extract Text saves recognized text as a .txt file. Scan Document can add the layer while you scan. Recognition uses Apple's Vision framework on your Mac, so files are not uploaded.

## Frequently asked questions

**Does OCR change how my PDF looks?**

No. The text sits invisibly behind the page image.

**Is OCR always accurate?**

No. Blurry scans, handwriting and unusual fonts can produce mistakes, so check important text.

**Does OCR need the internet?**

Not in Toolbox. Recognition runs on your Mac.

## Tools mentioned

- [**Make PDF Searchable**: Add an invisible text layer to scanned PDFs so you can search, select and copy their text.](https://mactoolbox.app/ocr-pdf-mac)
- [**Extract Text**: Recognize text in images, screenshots and scanned PDFs.](https://mactoolbox.app/extract-text-from-image-mac)
- [**Scan Document**: Scan paper with your iPhone or from photos. Pages are found, straightened and cleaned up into one PDF.](https://mactoolbox.app/scan-document-to-pdf-mac)
- [**Capture Text**: Select any area of the screen and copy the text in it.](https://mactoolbox.app/copy-text-from-screen-mac)

## Keep reading

- [Make PDF Searchable](https://mactoolbox.app/ocr-pdf-mac)
- [Extract Text](https://mactoolbox.app/extract-text-from-image-mac)
- [Scan Document](https://mactoolbox.app/scan-document-to-pdf-mac)
- [Capture Text](https://mactoolbox.app/copy-text-from-screen-mac)