Anonymize Columns

This tool replaces sensitive data in your CSV with fake but realistic-looking values. Pick which columns to anonymize, choose how each one should be handled, and get a privacy-safe version of your file instantly.

The output is consistent — the same value always produces the same replacement, so relationships between rows are preserved. You can safely share the anonymized file for analysis without exposing real names, emails, or other personal information.

What each option does

• Omit — Removes the column from the output completely.
• Redact — Replaces every value with a marker like ***REDACTED***.
• Hash (short) — Turns each value into a short 8-character code. The same value always gets the same code, so you can still match records — but you can’t reverse it back to the original. Works great for most files.
• Hash (full) — Same idea, but with a longer 64-character code. Use this if your file has more than about 10,000 unique values in a column — the longer code guarantees that two different values will never end up with the same code. For smaller files, Hash (short) is fine.
• Fake First Name / Last Name / Full Name — Swaps real names for fake ones that look realistic.
• Fake Email / Street Address / Phone Number — Swaps real contact info for fake versions.

How to use it

1. Provide your CSV — Paste it in, drop a file, or enter a URL.
2. Pick columns to anonymize — Use the dropdown to add columns. Each one defaults to Redact.
3. Choose how to handle each column — Select a method from the dropdown next to each column name.
4. Get your output — Copy the anonymized CSV or save it as a file.