Prompt Sanitizer: Remove Sensitive Data from AI Prompts
Prompt sanitizer online: detect and remove API keys, emails, phone numbers, and other sensitive data from prompts before sending to AI.
Updated 2026-08-16
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Features
- Detect API keys from OpenAI, Anthropic, Google, AWS, GitHub, and more
- Find email addresses in text
- Detect phone numbers in various formats
- Find credit card numbers (Visa, MasterCard, Amex, etc.)
- Detect IP addresses and URLs
- Find SSN (Social Security Numbers) and other ID patterns
- Custom replacement patterns: choose [REDACTED], [MASKED], or custom text
- One-click copy sanitized text
- Real-time detection as you type
How to Use
- 1Paste your AI prompt text into the input area.
- 2Sensitive data is automatically detected and highlighted.
- 3Review the detected items in the sidebar panel.
- 4Choose a replacement style: [REDACTED], [MASKED], or custom text.
- 5Click 'Sanitize' to replace all detected sensitive data.
- 6Copy the sanitized text to clipboard.
- 7Use the sanitized text when sending to AI services.
- 8Review the highlighted matches in the sidebar before sanitizing to confirm nothing important gets replaced.
Frequently Asked Questions
What types of sensitive data does the prompt sanitizer detect?
The tool detects: API keys (OpenAI, Anthropic, Google, AWS, GitHub, etc.), email addresses, phone numbers, credit card numbers, IP addresses, URLs, SSN patterns, and custom patterns you define.
Does this tool protect me from prompt injection?
No, it removes sensitive data (keys, emails, cards), not attack payloads. Prompt injection is a different class of threat: an injected instruction tries to hijack the model's behavior, and it can ride along in otherwise clean text. For injection detection and defense hardening, use the prompt-injection-tester tool instead; for secrets hygiene, keep using this one. The two tools complement each other.
Why is it risky to paste real API keys into AI prompts?
Whatever you paste into a chat or API call can be transmitted to the AI provider, logged on their side, included in support escalation, or shown to other users in shared sessions. A leaked key can be abused to spend your quota or call APIs on your behalf, and rotating a key means updating every system that uses it. Sanitize before sending, and if a real key was ever pasted into a prompt, revoke and rotate it even if the prompt was cleaned afterwards.
Can I add custom detection patterns?
Yes. You can add custom regex patterns to detect specific sensitive data formats unique to your organization. The tool supports regular expressions for flexible pattern matching.
What replacement options are available?
Default options include [REDACTED] and [MASKED]. You can also specify custom replacement text. The tool preserves the original text structure while replacing only the sensitive parts.
Does this work with non-English text?
Yes. The tool works with any text language. Detection patterns for API keys, credit cards, and email addresses are language-agnostic. Phone number detection supports international formats.
Can the ai prompt sanitizer be used on code files?
Yes. The tool can sanitize code files, configuration files, and any text content. It's useful for removing hardcoded credentials before sharing code or sending it to AI for review.
How accurate is the detection?
Detection is based on regex patterns and is highly accurate for common formats. However, it may miss obfuscated or non-standard formats. Always review detected items before sanitizing.
What happens to the original text?
The original text remains in the input area. The sanitized version is a separate output. You can switch between original and sanitized versions at any time.
Why does the tool flag things that aren't actually sensitive?
Detection uses regex patterns, which match formats, not meaning. A long digit run can be flagged as a phone number or card, sample keys like sk-xxx can be flagged as API keys, and date-like strings can match ID patterns. Always review the highlighted items before replacing; the sidebar shows exactly what matched and why. If a pattern is too aggressive for your content, define a narrower custom pattern instead.
Why can't the tool detect encoded or split secrets?
Regex matches plaintext formats only. A key that is Base64- or hex-encoded, split across environment variables, or stored in a key vault has no recognizable shape, so nothing is flagged, which is also true of any text-based detection tool. For real protection, don't paste secrets into prompts at all: reference them from environment variables or a secrets manager, and let the sanitizer catch the accidental plaintext cases.
Can I use this tool on Git commits?
Yes. Run the text of your diff or commit message through the tool before pushing to catch API keys or credentials that slipped in. Many security incidents happen because developers accidentally commit secrets to a repository; a quick sanitize pass before commit is a cheap habit that prevents costly rotations later.
Does it detect AWS key formats?
Yes. The tool detects AWS Access Key IDs (16-character keys starting with AKIA), AWS Secret Keys, and key formats from various cloud providers (OpenAI, Anthropic, Google, GitHub, and more). If your organization uses a proprietary key format, add a custom regex pattern to cover it.