CalculatorsEMI, SIP, GST, percentages and more — instant, accurate, free.ConvertersUnit and number-base converters for everyday engineering.FormattersBeautify, validate and transform text and code.GeneratorsUUIDs, passwords and other things you need on demand.CryptographyHashes and encodings, computed locally in your browser.Data & TransformConvert JSON, CSV, YAML, XML & TOML — and generate code from JSON.CSV ToolsConvert, clean, filter, analyze and transform CSV files — all in your browser.Encoding & DecodingBase64, Base32/58/62, Hex, Octal and Punycode encoders & decoders.Text ToolsCase conversion, counting, sorting, dedupe, reverse and more.ValidatorsValidate JSON, YAML, XML, CSV, TOML and more — with clear error messages.Repair ToolsFix broken JSON, CSV, XML, YAML and other malformed data.Diff & CompareCompare two texts, JSON, CSV, YAML, XML and more — highlight the differences.QR & BarcodesGenerate WiFi, vCard, URL and other QR codes, plus Data Matrix & Aztec barcodes.MinifiersShrink JSON, CSS, JavaScript, XML and SVG by removing whitespace.BeautifiersPretty-print and indent CSS, HTML and JavaScript.Security & TokensJWT, HMAC, key pairs, TOTP, PKCE, secure tokens and password tools.Developer UtilitiesCron, regex, timestamp, URL, JSONPath, XPath, escaping and more.Format ConvertersMarkdown⇄HTML, env/INI/properties⇄JSON, NDJSON, SVG data-URI and more.Image ToolsResize, crop, convert, compress, recolor and extract palettes — all in your browser.
Learn
Blog

Anonymize Columns

Free tool to anonymize CSV columns with consistent fake placeholders while keeping referential integrity, in your browser.

Learn more: CSV Files ExplainedThe CSV format, RFC 4180 quoting rules, encodings, common pitfalls, and how CSV compares to TSV, JSON and Parquet.

Columns

CSV

Result

Runs entirely in your browser — nothing you enter is uploaded or stored.

Ask about this tool on

Anonymize Columns

Free tool to anonymize CSV columns with consistent fake placeholders while keeping referential integrity, in your browser.

Paste your CSV on the left and the result is produced instantly on the right — entirely in your browser. Your data never leaves the page, which you can confirm from the Network panel or our privacy policy.

Frequently asked questions

How do I use the Anonymize Columns?

Paste or upload your CSV on the left, set the options, and the result appears on the right — copy or download it. Everything runs in your browser.

Is my data uploaded anywhere?

No. This tool runs entirely in your browser — your CSV is never sent to a server. You can verify it in the Network tab or in our Content-Security-Policy.

Is the Anonymize Columns free?

Yes — completely free, no sign-up and no limits. Everything happens client-side.

Anonymize Columns

Frequently asked questions

Related tools