How to make a scanned PDF searchable, then check it worked

What "searchable" actually means

When you scan paper to PDF, Adobe explains, "the resulting file contains only image data, not searchable text." The page looks like text, but to your computer it is a photo. Search finds nothing, you can't copy a sentence, and screen readers have nothing to read.

Making it searchable means running OCR (optical character recognition). The tool reads the letters in the image and adds an invisible text layer behind it. The page looks exactly the same, but now you can search, select and copy.

This is different from converting the scan into an editable Word file. A searchable PDF keeps the original image; you just gain a text layer. If you want to rewrite the content, see our guide to turning a scanned PDF into an editable Word document.

First, test what you have

Open the PDF and press Ctrl+F (Cmd+F on a Mac). Search for a word you can clearly see on the page.

• Found and highlighted: the PDF already has a text layer.

• No results: it is image only. Read on.

• Found, but the highlight is in the wrong place: an earlier OCR pass was poor. Running it again with better settings can help.

Option 1: Adobe Acrobat (paid)

Acrobat's Scan & OCR tool is built for this. Adobe's steps for one file:

1. Save a backup copy of the original scan. Adobe recommends this.

2. Remove any security restrictions on the file.

3. Open the PDF and select All tools → Scan & OCR.

4. Select In this file.

5. Choose the page range and the language of the document.

6. Select Recognize Text. Acrobat adds a searchable text layer.

For a folder of scans, choose In multiple files instead, add the PDFs and pick an output folder. Acrobat saves searchable copies there.

Fix the words it wasn't sure about

Adobe says that when a match is uncertain, Acrobat marks the word as a suspect: it shows the original image but places searchable text behind it. To review them:

1. Open All tools → Scan & OCR.

2. Select Correct recognized text, then tick Review recognized text.

3. Click each highlighted box, fix the Recognized as field if needed, and select Accept.

On a long document, check at least the names, numbers and terms you are most likely to search for.

Option 2: Google Drive (free, on your phone)

The Google Drive app for Android and iOS has a built-in scanner. Google says it lets you scan documents like "receipts, letters, and billing statements to save them as searchable PDFs." Google notes the web version of Drive doesn't offer scanning.

This works for paper you still have. Point the app at each page, let it crop, and save. It doesn't help with a scanned PDF someone has already emailed you.

Option 3: Google Docs (free, for a copy of the text)

For an existing scan, Google Drive on a computer can read the text: right-click the file and choose Open with → Google Docs. Google's limits are that the file should be a PDF or a JPEG, PNG or GIF image of 2 MB or smaller.

The catch: this gives you a separate Google Doc with the extracted text, not a searchable version of your PDF. Google also says lists, tables, columns, footnotes and endnotes are not likely to be detected. It is handy when you need to find or copy a passage, not when you need the original file to be searchable.

Option 4: Phone scans from Apple or Microsoft

• iPhone and iPad: Notes and Files can scan documents (tap Scan Documents, adjust the corners, Keep Scan). Apple's scanning guide doesn't say whether the saved PDF includes a text layer, so run the search test above before relying on it.

• OneDrive: Microsoft recommends the OneDrive app's scanner now that Microsoft Lens has been retired; scanning in Lens ended on March 9, 2026. Again, test the result with a search.

Settings that improve accuracy

• Set the right language. Acrobat asks for it. A Spanish document read as English produces garbled accents and missed words.

• Straighten and crop pages before OCR. Skewed lines lower accuracy.

• Rescan if you can. A sharp, evenly lit scan beats any setting. Google's guidance for its own OCR is text at least 10 pixels high, upright pages, and sharp images with clear contrast.

• Split mixed documents. If some pages are in one language and some in another, process them separately.

How to check the result properly

A searchable PDF can still be wrong in ways you can't see, because the text layer is invisible. Five quick tests:

1. Search for names and numbers you know are in the document: a surname, an invoice number, a date.

2. Copy a paragraph and paste it into a plain text editor. Look for joined words, broken lines and odd characters.

3. Check two-column pages. Paste a section and see whether the left and right columns came out in the right order.

4. Look for look-alike swaps such as 0 and O or 1 and l in numbers you might search for.

5. Check a page with a stamp, signature or handwriting. These areas often produce nonsense text or none at all.

A sample

"Northgate Tenants Association minutes, 2019–2025" (fictional) is a 140-page scan. You run Recognize Text in Acrobat with English selected, then search for "boiler." It finds 11 hits, but you know the 2021 minutes discuss it too. Those pages are faint photocopies, so you rescan them, run OCR again on just those pages, and the search now finds 14.

Need an editable file rather than a searchable one?

A searchable PDF is ideal for archives and finding things. When you need to change the text, EasyToDecode is launching soon with a converter that turns scans and photos into Word files with columns, tables and headings kept in place, and flags pages that don't closely match the original. See how it works or join the waitlist to hear when it opens.