What is Highlight Text / Censor?
The Highlight Text tool wraps every occurrence of a search term in brackets 【term】 for visual emphasis, making it instantly visible in a block of text. The Censor tool replaces matched words with asterisks (****), matching the original word length to preserve readability while obscuring content.
Both modes support case-insensitive matching (enabled by default) and regular expressions for advanced pattern matching. This makes the tool versatile enough for simple word searches and complex text processing tasks.
This tool is essential for:
- Editors and proofreaders flagging specific terms in manuscripts
- Content moderators censoring sensitive information in documents
- Teachers creating fill-in-the-blank exercises from existing text
- Privacy officers redacting names, emails, or phone numbers
- Developers testing pattern matching in text data
Related: Find and Replace · Regex Find/Replace
Why You Need Highlight/Censor in 2026
1. Privacy Compliance
Data privacy regulations like GDPR and CCPA require redacting personal information before sharing documents. The censor mode instantly replaces names, emails, and phone numbers with asterisks, helping you comply without manual editing.
2. Educational Content Creation
Teachers and trainers create quizzes by censoring key terms in passages. Students read the censored text and fill in the blanks — a proven learning technique that active recall research supports.
3. Content Review Workflows
Editors reviewing large manuscripts use highlighting to flag recurring terms, inconsistencies, or areas needing revision. Highlighting makes patterns visible that a human eye would miss in plain text.
4. Sensitive Data Masking
When sharing code snippets, configuration files, or data exports, censoring API keys, passwords, and tokens prevents accidental credential exposure — a critical security practice in remote teams.
5. Accessibility and Readability
Highlighting key terms improves comprehension for readers with dyslexia or attention disorders. Visual emphasis helps guide the eye through dense text, improving overall readability.
✨ Try Our Free Tool
How to Use: Step-by-Step
Step 1: Paste Your Text
Copy the text you want to process and paste it into the input area.
Step 2: Enter Your Search Term
Type the word or phrase you want to highlight or censor. Enable "Use regex" if you need pattern matching (e.g., \d+ for numbers).
Step 3: Choose Highlight or Censor
Click Highlight to wrap matches in 【brackets】, or Censor (***) to replace them with asterisks. The output updates instantly.
Step 4: Copy or Export
Copy the output from the results area. The processed text preserves the original formatting with your highlights or censored words in place.
Real-World Examples
Scenario: A teacher creates a reading comprehension quiz from a paragraph about photosynthesis.
Challenge: Manually replacing 8 key terms with blanks is tedious and error-prone.
Solution: Enter terms like "chlorophyll", "sunlight", "carbon dioxide" one at a time, click Censor. Each term becomes asterisks of matching length. The paragraph becomes a ready-to-use quiz in under a minute.
Scenario: A compliance officer needs to redact employee names from a HR incident report before sharing with external auditors.
Challenge: The report contains 12 names scattered across 3 pages. Manual redaction risks missing some.
Solution: Paste the report, enter each name, click Censor. Every instance is replaced with asterisks. Verify with a second pass — the tool finds all occurrences, even in footnotes.
Scenario: A developer wants to highlight all instances of "error" and "warning" in a 500-line log file.
Challenge: Scanning visually through hundreds of lines is slow and unreliable.
Solution: Use regex mode with the pattern error|warning. Click Highlight. All matches are wrapped in 【brackets】, making them instantly visible for quick triage.
Best Practices
1. Use Regex for Multiple Terms
Instead of highlighting terms one at a time, use regex with the pipe operator (term1|term2|term3) to process all patterns in a single pass.
2. Verify Case Sensitivity
Case-insensitive matching is enabled by default, which catches "Error" and "error". Disable it when case matters — for example, distinguishing "US" (country) from "us" (pronoun).
3. Test Regex Patterns First
Complex regex can produce unexpected results. Test your pattern on a small sample before processing large documents. The tool shows error messages for invalid patterns.
4. Combine with Find/Replace
For complex workflows, use our Find and Replace tool first to normalize text, then highlight or censor specific patterns.
Frequently Asked Questions
Q: What does "case-insensitive" mean?
A: "cat" will match "Cat", "CAT", "cAt", etc. Enabled by default.
Q: What is regex?
A: Regular expressions let you match patterns, not just exact words. For example, \d+ matches any number.
Q: Does this tool work offline?
A: Yes, all processing happens in your browser. No data is sent to any server.
Q: Is there a limit to how much text I can paste?
A: No, you can paste documents of any length.
Q: Does it handle special characters and emojis?
A: Yes, the tool works with any Unicode text including special characters and emojis.
Q: Can I use this for academic work?
A: Absolutely. It is ideal for creating fill-in-the-blank exercises, redacting sensitive information in research data, and highlighting key terms in academic papers.