Highlight Keywords in Text Online
Text Highlighter lets you highlight keywords in text by marking every match in a different color. Add as many keywords as you like, give each its own color, and the tool instantly highlights all occurrences as you type or paste.
Unlike a plain find box, each keyword keeps its own matching rules — case-sensitive, whole word, or regex — so you can color-code different kinds of content side by side. It is handy for writers checking overused words, students marking key terms, and developers scanning logs for patterns.
How to Highlight Text
Add your text
Type or paste your text into the input area. Use the Paste button to pull text straight from your clipboard.
Add keywords with colors
Type a keyword, pick one of the eight preset colors (or choose a custom color), then press Enter or click Add. Every keyword appears as a colored tag.
Tune the matching
Expand a keyword tag to toggle Aa (match case), the whole-word option, or .* (regex). Options can be combined per keyword.
Navigate and copy
Step through matches with the Previous / Next buttons or Ctrl+↑ / Ctrl+↓, then click Copy Matches to grab every unique match.
Features
Multi-Color Highlighting
Give each keyword its own color from eight presets or a custom color picker, so different categories stay easy to tell apart.
Per-Keyword Matching Options
Set case-sensitive, whole-word, or regex matching independently for every keyword, and combine the options as needed.
Regex Support
Switch on regex mode for pattern matching, with a built-in quick-reference guide showing common patterns and quantifiers.
Match Navigation
Jump between matches with the navigator or Ctrl+↑/↓. The current match is outlined and the view scrolls to it automatically.
Live Statistics
See the total number of keywords and matches at a glance, plus an individual match count on every keyword tag.
Copy Matches
Copy every highlighted match to your clipboard in one click. Duplicates are removed so you collect only unique results.
Persistent Keywords
Your keywords and their settings are saved in your browser, so they are restored exactly as you left them next time.
100% In-Browser
All text processing happens locally in JavaScript. Nothing is uploaded, and your text never leaves your device.
Frequently Asked Questions
How do I highlight specific words in my text?
Paste or type your text, type a word into the keyword field, pick a color, and press Enter. Every occurrence of that word is instantly highlighted in the chosen color.
Can I highlight multiple keywords with different colors?
Yes. Add as many keywords as you need, and assign each one its own color from the eight presets or the custom color picker. There is no fixed limit, though a reasonable number works best on very long texts.
Does it support case-sensitive, whole-word, and regex matching?
Yes, and each keyword sets its own rules. Expand a keyword tag and toggle Aa for case-sensitive, the arrows icon for whole word, or .* for regex. With whole word on, "test" matches only the full word "test", not "testing" or "contest". The options can be combined.
What happens when keywords overlap?
When two keywords would match the same span of text, the match that appears first in the text wins. That overlapping portion is highlighted in the first matching keyword's color.
Why isn't my regex pattern working?
Make sure regex mode (.*) is enabled on that keyword and that the pattern is valid JavaScript regex syntax. An invalid pattern simply highlights nothing rather than showing an error, so test simple patterns before building complex ones.
How do I remove a keyword?
Click the remove (×) button on a keyword tag to delete that one, or use Clear All in the Keywords panel to remove every keyword at once.
Are my keywords saved between sessions?
Yes. Keywords and their matching settings are stored in your browser's local storage and restored when you return. Clearing your browser data will remove them.
Is my text uploaded to a server?
No. All processing happens entirely in your browser, and your text is never sent anywhere. Only your keyword settings are saved locally on your device.
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