How to Extract Text From a Scanned PDF (OCR)
June 30, 2026 · 5 min read
A scanned PDF looks like a normal document, but to a computer it is just a picture of text. You can't select a sentence, copy a phone number, search for a name, or correct a typo — because there are no actual letters in the file, only pixels. Optical Character Recognition (OCR) solves this by reading those pixels and turning them back into real, editable text. The best part: you can do it entirely in your browser, without uploading your document anywhere.
What is OCR, and why do scanned PDFs need it?
When you scan a paper document or photograph it with your phone, the result is an image embedded in a PDF. The page may show the words clearly to you, but the file contains no text layer — the invisible data that lets software know which characters appear where. OCR analyses the image, recognises each character and word, and rebuilds that text layer. Once it exists, the PDF behaves like any document you typed yourself.
Why run OCR in the browser?
Most OCR services ask you to upload your file to their servers. For contracts, invoices, ID documents, and medical records, that is a real privacy risk. Modern browsers are now fast enough to run OCR locally using WebAssembly, so your document never leaves your device.
- Private by design: The recognition happens on your own computer. Your file is never uploaded.
- Free and instant: No account, no subscription, and no software to install.
- Works everywhere: Windows, macOS, Linux, and Chromebooks — all you need is a browser.
What you can do after recognising text
Once techyworks has added a text layer to your scanned PDF, the document comes to life:
- Edit the text: Click a line with the Edit text tool to correct a typo or change a word in place.
- Find & replace: Search the whole document for a word and replace every occurrence at once.
- Select and copy: Highlight passages to copy them into an email, a spreadsheet, or a new document.
- Annotate accurately: Underline or highlight specific words now that the editor knows exactly where they sit.
Step-by-step: OCR a scanned PDF with techyworks
Recognising text takes just a few clicks:
- Step 1 — Open your scan: Go to techyworks.online and drop your scanned PDF onto the editor, or click "Browse files" to choose it.
- Step 2 — Start recognition: If the editor detects a scan, an amber banner appears with a Recognize text button. You can also open the Document menu and choose Recognize text (OCR).
- Step 3 — Wait for each page: A progress bar shows the document being processed page by page. The first run downloads the recognition engine, so give it a moment.
- Step 4 — Edit or search: Use the Edit text tool to change words in place, or press Ctrl+F to find and replace text across the whole file.
- Step 5 — Download: Click download to save your updated PDF. Everything is generated locally in your browser.
Tips for the most accurate results
OCR quality depends heavily on the quality of the original scan. A few habits make a big difference:
- Scan at 300 DPI or higher. More detail gives the engine more to work with, especially for small print.
- Keep pages straight. Crooked or skewed scans are harder to read — straighten the page before recognising it.
- Aim for good contrast. Dark text on a clean white background is recognised far more reliably than faint or shadowed scans.
- Flatten creases and glare. Folds, shadows, and reflections from phone photos can confuse the recogniser.
Limitations to keep in mind
OCR is powerful but not magic. Handwriting, decorative fonts, stamps, and very low-resolution scans may not be recognised perfectly, so it is always worth proofreading the result. Recognition currently works best with printed English text. For clean, typed documents, though, accuracy is usually excellent — and because you can edit the text immediately afterward, fixing the occasional mistake is quick.
Turn any scan into a working document
With browser-based OCR you no longer have to retype a document just because it arrived as a scan. Open your file, recognise the text, and you are free to edit, search, copy, and annotate it like any other PDF — all without surrendering your privacy. Try it now with the free editor at techyworks.online.