Text Find and Replace Online Free — Batch Search & Replace with Regex

Overview: Search, count, and replace text occurrences with regex power in your browser.

Search and batch replace words, phrases, or regex patterns across text. Supports case-matching, whole words, and match counting. All computations and data processing are executed 100% locally on your device using client-side WebAssembly, HTML5 Canvas, and modern Web APIs without uploading files to any external server.

Supported Formats

Text Find & Replace Studio supports the following file formats:

  • TXT — client-side processing support.

How to Use Text Find & Replace Studio in Browser

  1. Paste Text: Paste your document or source text into the input editor.
  2. Enter Search Terms: Type the string to find and the replacement text.
  3. Toggle Options: Enable Case Sensitive, Whole Words, or Regex as needed.
  4. Copy or Save: Copy the updated text or download as a .txt file.

Key Features & Privacy Protections

  • 100% Client-Side Privacy: Zero cloud upload. Your documents, photos, and files never leave your local browser sandbox.
  • Zero Installation: Runs instantly in Chrome, Safari, Firefox, Edge, Android, and iOS browsers.
  • Free Forever: No sign-up, no subscriptions, no ads, and no file size limits.

Frequently Asked Questions (FAQ)

Does it support regular expressions?

Yes, enable the 'Regular Expression' toggle to use full JavaScript regex syntax and capture group patterns.

Does it report the number of replacements made?

Yes, an instant badge displays the total count of matches found and replaced.

What does Whole Words Only do?

It uses word boundary assertions () so replacing 'cat' won't accidentally alter 'catch' or 'category'.

Can I handle large text files?

Yes, documents with tens of thousands of words are processed in milliseconds in memory.

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Text Find & Replace Studio

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v1.0.0Free · RegExp StudioText & Writing Tools

Text Find and Replace Online Free — Batch Search & Replace with Regex

Search, count, and replace text occurrences with regex power in your browser.. Search and batch replace words, phrases, or regex patterns across text. Supports case-matching, whole words, and match counting.

What is Find & Replace and what does it do?

The Text Find & Replace Studio is an advanced text editing utility that allows users to search, count, and batch replace words, phrases, or regular expression patterns across documents in real time.

Featuring case-matching, whole-word filtering, regex flags, and instant replacement counting, it streamlines document cleanup and data sanitization without cloud privacy risks.

  • Batch search and replace words, phrases, or regular expression patterns across long text documents.
  • Whole Words Only toggle () to prevent accidental substring replacements within larger words.
  • Case Sensitive matching toggle to target exact capitalization variants.
  • Full JavaScript regular expression support with live syntax validation and error reporting.
  • Real-time match count badge reporting exact occurrence numbers and one-click copy/download.

How does Find & Replace work?

Input search queries are parsed into compiled RegExp instances with appropriate global and case flags. Special regex characters are escaped when plain-text mode is selected.

The string executes String.prototype.replace() in memory, counting matches and outputting the updated document without blocking the UI thread or sending text over the network.

100% private: all processing happens locally in your browser using client-side WebAssembly, HTML5 Canvas, and modern Web APIs. Your files are never uploaded to any server.

Who needs Find & Replace?

Writers, Editors & Proofreaders

Batch update character names, outdated terminology, or brand names across entire book drafts and articles.

Data Analysts & Researchers

Clean raw text datasets, standardize survey response naming, and sanitize recurring data artifacts.

Developers & Sysadmins

Perform regex-powered string replacements on configuration files, SQL queries, and log dumps.

Legal & Administrative Staff

Replace party names, dates, and contract terms across multi-page legal agreement templates.

Supported file formats

Text Find & Replace Studio processes the following file extensions and data formats directly in your browser:

TXT

How to use Find & Replace — step by step

  1. 1

    Paste Text

    Paste your document or source text into the input editor.

  2. 2

    Enter Search Terms

    Type the string to find and the replacement text.

  3. 3

    Toggle Options

    Enable Case Sensitive, Whole Words, or Regex as needed.

  4. 4

    Copy or Save

    Copy the updated text or download as a .txt file.

Frequently asked questions

Does it support regular expressions?

Yes, enable the 'Regular Expression' toggle to use full JavaScript regex syntax and capture group patterns.

Does it report the number of replacements made?

Yes, an instant badge displays the total count of matches found and replaced.

What does Whole Words Only do?

It uses word boundary assertions () so replacing 'cat' won't accidentally alter 'catch' or 'category'.

Can I handle large text files?

Yes, documents with tens of thousands of words are processed in milliseconds in memory.

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