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Text CleanerBuild a reusable Unicode cleanup, extraction, and formatting pipeline for untidy text and lists.Remove Duplicate LinesDeduplicate lines while controlling case, whitespace, order, and blanks.Remove Empty LinesDelete blank rows or collapse them while preserving paragraph structure.Trim WhitespaceRemove unwanted leading or trailing whitespace with indentation control.Remove Extra SpacesNormalize repeated spaces, tabs, and non-breaking spaces safely.Sort LinesSort text alphabetically, naturally, numerically, or by length.Add Prefix and SuffixWrap, number, or punctuate every line with practical presets.Delimiter ConverterConvert lists between lines, commas, tabs, pipes, and custom separators.Compare Two ListsFind unique, shared, and duplicated items across two lists.Find and ReplaceReplace plain text or guarded regular-expression matches.Case ConverterSwitch text among readable, coding, path, and letter-case formats.Word, Character and Line CounterMeasure words, grapheme 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default.Unicode NormalizerNormalize text to NFC, NFD, NFKC, or NFKD and compare changed code-point positions.Unicode Code Point InspectorInspect characters or graphemes with code points, encodings, categories, positions, and export.JSON Formatter and ValidatorValidate JSON, pinpoint syntax errors, and format it with controlled indentation and Unicode output.JSON MinifierValidate JSON and remove insignificant whitespace while preserving string values exactly.JSON to CSVConvert an array of JSON objects to previewable, configurable CSV.CSV to JSONParse quoted CSV safely and convert rows to JSON objects or arrays.CSV Viewer and CleanerPreview, filter, reshape, clean, sort, and export CSV entirely in a Web Worker.Base64 Encode and DecodeEncode or decode UTF-8 text with standard Base64 or Base64URL.URL Encoder and DecoderEncode full URLs or URI components and decode percent-encoded text.HTML Entity Encoder and DecoderEscape HTML special characters or decode named and numeric entities.JWT 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Link GeneratorGenerate WhatsApp click-to-chat URLs from a phone number and optional messageCSV Formula Injection SanitizerNeutralize spreadsheet formula-like cells in pasted CSV without uploading the data.CSV Column Mapper and RenamerRename CSV headers and reorder selected columns locally.CSV to Markdown TableConvert a small CSV or TSV paste into a Markdown table.CSV Encoding and BOM InspectorInspect BOM markers, line endings, and byte-oriented clues in pasted CSV text.CSV Data Quality ReportProfile headers, row widths, empty values, and duplicate rows in a CSV paste.TSV and Delimited File ValidatorCheck whether delimited text has consistent columns and balanced quotes.Spreadsheet Date Serial ConverterConvert spreadsheet serial dates to ISO dates using an explicit date system.JSON and CSV Batch PreviewerPreview JSON records or CSV rows as a compact local report.CSP Header Builder and ValidatorBuild and inspect a Content-Security-Policy from pasted directives.SRI Hash GeneratorGenerate a browser-local SHA-256 Subresource Integrity token for pasted asset text.HTTP Security Headers AnalyzerAnalyze pasted HTTP response headers for common security controls.X.509 Certificate DecoderInspect pasted PEM certificate metadata locally.SSH Public Key Fingerprint InspectorInspect SSH public key format and calculate a local fingerprint.JWT Claims and Expiry InspectorDecode JWT claims and explain standard time claims without verifying a signature.JSON Web Key Set InspectorInspect a pasted JWK or JWKS structure without fetching remote keys.Environment Variable Secret ScannerScan pasted .env-style text for likely secrets and risky variable names.Markdown Table of Contents GeneratorGenerate a nested Markdown table of contents from heading lines.Markdown LinterCheck pasted Markdown for common heading, spacing, and list consistency issues.HTML Sanitization PreviewerPreview a conservative sanitized version of pasted HTML.HTML Accessibility CheckerCheck pasted HTML for common image, link, heading, and form labeling issues.Meta Title and Description PreviewerPreview title and description lengths for search and social snippets.robots.txt Generator and ValidatorGenerate and inspect robots.txt directives from pasted path rules.Sitemap XML Generator and ValidatorValidate pasted URLs and generate a simple local sitemap XML document.JSON-LD Formatter and ValidatorFormat pasted JSON-LD and check basic context and type structure.

184 tools available.

Structured data

CSV Data Masker

Prepare reviewable masked data without claiming guaranteed anonymization.

Processed locally. Your input and output are never uploaded.

Ready

Input0 lines ยท 0 characters
Output0 lines ยท 0 characters
OptionsProcessing remains local; review the result and documented limits before using it.
CSV Data Masker Options
Press Ctrl/Cmd + Enter to process

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Tool overview

How CSV Data Masker works

CSV Data Masker transforms selected columns using fixed redaction, sequential aliases, or deterministic pseudonyms without saving the salt. It keeps input and output separate, runs locally, and documents boundaries instead of making unsupported guarantees.

Prepare a reviewable masked export

  • transforms selected columns using fixed redaction, sequential aliases, or deterministic pseudonyms without saving the salt. for a repeatable local workflow
  • Review pasted or locally opened data before copying it
  • Prepare output for a related PasteTidy tool

Select columns and masking mode

  1. Paste the source or open a supported local file.
  2. Choose the documented options and review the separate result.
  3. Copy or download only after checking the visible output.

Redaction, aliases, and pseudonyms

  • Columns to mask: Comma-separated header names; blank means all.
  • Mask mode: Select redaction, aliases, or pseudonyms.
  • Redaction text: Replacement in redaction mode.
  • Alias prefix: Prefix in alias mode.
  • Pseudonym salt: Current-session salt for pseudonyms.
  • Output delimiter: Separator for the result.

Mask contact columns locally

Before
name,email
Ana,ana@example.com
Bo,bo@example.com
After
name,email
[REDACTED],[REDACTED]
[REDACTED],[REDACTED]

Masking is not anonymization

  • Masking and pseudonymization are not guaranteed anonymization.
  • Large input is bounded by the documented local worker limits.
  • Input, options, and output are not sent to analytics or placed in URLs.

Browse all structured data tools โ†’

Questions

CSV Data Masker FAQ

Does CSV Data Masker upload my input?

No. Processing stays in the current browser tab or its local Web Worker.

Is the result authoritative?

No. Review the output and the documented limitations before using it in a production workflow.