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How-To

How to Find Keywords in a PDF for Free

· 6 min read

Quick summary: To find keywords in a PDF for free, open it in Chrome, Edge, or Preview and press Ctrl+F (Windows) or Cmd+F (Mac). Type your keyword — the viewer highlights every match and shows how many times it appears. Press Enter to jump between occurrences. Repeat with a different search term to check multiple keywords one at a time.

Finding keywords in a PDF is different from a single Ctrl+F lookup — it’s about systematically checking whether specific terms appear anywhere in a long document, how often, and where, which matters for legal review, research, compliance checks, and content audits. This guide covers finding and counting keywords, not just jumping to the first match. You can also upload a PDF to our free AI PDF reader and simply ask it whether a topic or term is covered, without manually searching.

How to find a keyword in a PDF and see every match

In a browser (Chrome, Edge)

  1. Open the PDF in Chrome or Edge.
  2. Press Ctrl+F (Windows) or Cmd+F (Mac).
  3. Type the keyword.
  4. The browser shows a match count (e.g., “3 of 17”) and highlights every occurrence on the page you’re viewing, with a small orange/yellow marker on the scrollbar showing where other matches are located in the document.
  5. Press Enter or click the down arrow to jump to the next match.

On Mac (Preview)

  1. Open the PDF in Preview.
  2. Press Cmd+F.
  3. Type the keyword — Preview highlights every match in yellow and shows a sidebar with each match in context (a snippet of surrounding text), so you can scan all occurrences without jumping through the document one at a time.
  4. Click any sidebar result to jump straight to it.

On iPhone or iPad

  1. Open the PDF in Files or Safari.
  2. Tap the Share icon → scroll to “Find in PDF” or the search icon depending on the app.
  3. Type your keyword — matches are highlighted and you can tap through them.

How to find multiple keywords in a PDF

There’s no single search box that finds several different terms at once in most free viewers, but you can check them efficiently in sequence:

  1. Search the first keyword with Ctrl+F / Cmd+F and note the match count.
  2. Clear the search box and type the next keyword.
  3. Repeat for each term on your list.

For a long list of keywords to check across many documents, extracting the text first (see below) and searching it in a text editor or spreadsheet is faster than repeating this in a PDF viewer each time.

How to count how many times a keyword appears

The match counter built into Chrome, Edge, and Preview (e.g., “1 of 12”) already gives you this — the total number after “of” is the count. For a more precise or exportable count:

  1. Extract the PDF’s text — see how to extract text from a PDF for free.
  2. Paste the text into a word processor or spreadsheet.
  3. Use Find & Replace → Replace All with the keyword replaced by itself — most word processors report the number of replacements made, which equals the number of matches.

How to find keywords in a scanned PDF

If Ctrl+F finds nothing even though you can see the word on the page, the PDF is a scanned image with no real text layer — there’s nothing for the search function to match against.

  1. Run OCR to convert the scanned image into searchable text — see how to OCR a PDF for free.
  2. Once OCR’d, use Ctrl+F / Cmd+F normally on the result.

How to search for exact phrases vs. individual words

Most PDF search boxes treat your entire input as a phrase match by default — typing annual report looks for that exact two-word sequence, not pages containing “annual” and “report” separately anywhere. To find pages containing either word independently, search each one on its own.

Case sensitivity: Standard PDF viewer search (Ctrl+F) is not case-sensitive by default — searching “Budget” also finds “budget” and “BUDGET.” This is usually what you want; there’s no built-in toggle to make it case-sensitive in Preview, Chrome, or Edge.

How to find keywords across multiple PDFs at once

Built-in PDF viewers only search one open document at a time. To check a keyword across many files:

  • Mac (Spotlight): Press Cmd+Space, type your keyword — Spotlight searches the text content of PDFs stored on your Mac (if they have a text layer) and lists matching files.
  • Windows (File Explorer search): Type the keyword into the File Explorer search bar while inside a folder — Windows indexes PDF content in most configurations and returns matching files.
  • Google Drive: Use Drive’s search bar — it searches inside PDF text content for files stored there, including some OCR’d scanned PDFs.

Frequently Asked Questions (FAQ)

Why does Ctrl+F find nothing in my PDF even though the word is visible?

The PDF is almost certainly a scanned image with no underlying text layer — the “words” you see are just pixels in a picture, not searchable text. Run OCR first, then search again.

What’s the difference between “search a PDF” and “find keywords in a PDF”?

They use the same underlying tool (Ctrl+F), but “finding keywords” usually implies checking for several specific terms systematically — for compliance review, research, or content auditing — rather than a one-off lookup for a single word you already expect to find. See how to search a PDF for free for the general single-term search workflow.

Can I highlight all instances of a keyword permanently in the PDF?

Ctrl+F highlighting is temporary and disappears when you close the search box. To make highlights permanent, you need to manually select and highlight each occurrence using annotation tools — see how to highlight in a PDF for free.

How do I find keywords in a PDF without opening each page manually?

Ctrl+F / Cmd+F already does this — you don’t need to scroll through pages manually. The search jumps directly to each match regardless of which page it’s on, and the match counter tells you the total before you even start navigating.

Can I search for a keyword and its synonyms at once?

Standard PDF search only matches exact text, not synonyms or related terms. For that kind of semantic search, upload the PDF to an AI-powered tool — our free AI PDF reader can answer questions like “does this document mention anything about refund policies?” even if the exact word “refund” doesn’t appear.

Does keyword search work the same in a password-protected PDF?

Yes, once you’ve entered the password to open the file — search functions normally afterward. If you don’t have the password, see how to unlock a PDF for free first.

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