Add Curse Words to Text
Inject profanity into text. Useful for testing censorship filters and content moderation systems.
Injection Settings
Higher intensity replaces more words with curses.
About this tool
Randomly replaces words in your text with common English swear words. This is primarily a utility for developers testing "bad word" filters or sentiment analysis systems.
Developer Tool: This utility is for testing content moderation systems. Use responsibly.
Add Curse Words to Text – Content Filter Testing Tool
A specialized utility for developers, QA engineers, and trust & safety teams. Stress-test your content moderation systems, chat filters, and sentiment analysis bots by injecting controlled profanity into clean text. Essential for verifying your safety mechanisms work before launching to real users.
What Is This Tool For?
The Add Curse Words tool takes innocent input text and randomly replaces words with common English profanities based on a selected intensity percentage. It creates "dirty" test data useful for verifying if safety mechanisms work correctly.
Before launching any user-generated content feature (comments, chat, reviews), you need to test your content filter. This tool generates realistic test cases without team members having to manually type offensive content—protecting both your users and your team.
Who Uses This Tool?
QA Engineers
Verify that your app's content filter catches profanity before going live. Test edge cases and filter coverage.
Bot Developers
Test Discord, Twitch, Slack, or custom chat bots to ensure they auto-moderate messages containing banned words.
AI Researchers
Generate negative examples for training sentiment analysis models, toxicity classifiers, or content moderation AI.
Why Use This Tool?
Safe Test Generation
Generate offensive test data without anyone having to search for or type it. Protects your team.
Controllable Intensity
From mild (10%) to severe (100%), control exactly how much profanity to inject for different test scenarios.
Instant Results
Generate thousands of words of test data instantly in your browser. No rate limits, no API keys needed.
How to Use
- Paste clean text (Lorem Ipsum, sample content, or actual test messages) into the input.
- Adjust the intensity slider to control what percentage of words get replaced with profanity.
- Copy the corrupted output and paste it into your content filter, chat bot, or moderation system to test.
Example (Censored for Display)
The quick brown fox jumps over the lazy dog.
The **** brown fox **** over the lazy ****.
Frequently Asked Questions
Is this tool allowed and legal?
Yes, this tool is intended for educational and testing purposes—specifically for testing content moderation systems, chat filters, and AI safety mechanisms. We prohibit using it to generate harassment or abuse.
Who should use this tool?
Software developers, QA engineers, trust & safety teams, and AI researchers who need to test content moderation filters, chat bots, sentiment analysis models, or content classification systems.
Can I choose which curse words to use?
Currently, the tool uses a fixed list of common English profanity targeted by standard moderation filters. This ensures consistent testing against typical filter implementations.
How does the intensity slider work?
The intensity slider (10-100%) controls what percentage of words get replaced with profanity. At 10%, roughly 1 in 10 words becomes profane. At 100%, nearly every word is replaced. Lower settings are more realistic for testing.
Does it produce grammatically correct text?
No, the tool deliberately produces chaotic, noisy data. It randomly replaces words regardless of grammar. This is intentional—it creates worst-case test scenarios for your filters.
Is my data private?
Yes. All processing happens in your browser. We never see, store, or log your input text or generated output. Safe for testing with internal content.
Can I use this to test Discord/Twitch bots?
Absolutely. Generate test messages with varying profanity intensity and paste them into your bot's testing environment to verify it catches and handles bad words correctly.
Is this useful for AI/ML training?
Yes. Generate negative examples for training sentiment analysis models, content classifiers, or toxicity detection systems. The controlled injection helps create balanced training datasets.
Why would I need profane test data?
Before launching any public-facing chat, comments, or user input feature, you need to verify your content filter actually works. This tool creates realistic test cases without anyone having to manually type offensive content.
Can I use the output in production?
This tool is for TESTING environments only. Never expose generated profane content to real users. Use it in staging/development to verify your filters work before going live.
What languages are supported?
Currently, the tool uses common English profanity. It works best with English input text. The curse words list targets typical English-language content moderation filters.
Is there an API for automated testing?
Currently this is a browser-based tool. For automated testing pipelines, you could use the same algorithm in your test scripts. The word list is standard across moderation systems.