Find and Replace Text Online - Batch Replace Spaces, Commas, Line Breaks, and File Import/Export

it365 Toolbox

Find

Replace with

Presets:

Auto Replace Auto Copy Result

Case Conversion:

Input Text

Characters: {{ inputText.length }} Lines: {{ inputText ? inputText.split('\n').length : 0 }}

Replacement Result

Characters: {{ outputText.length }} Lines: {{ outputText ? outputText.split('\n').length : 0 }}

Click to select a file, or drag and drop it here

Supports any text file format

After importing, click the "Download" button under "Replacement Result" on the right to download the replaced file.

Show file content in input box (Disabled by default)

Tip: For very large files, disabling this option will boost performance and prevent browser lagging.

How to Quick Find & Replace Characters / Words Online?

Replace Spaces with Underscores (_) or Hyphens (-)

When naming variables in code, generating URL slugs, or renaming files, removing spaces is essential. Simply enter a space in "Find" and an underscore `_` or hyphen `-` in "Replace with" to batch replace them. Our "Presets" already integrate actions like "Remove Spaces" and "Spaces ➔ Underscores" for instant execution.

Replace Line Breaks with Commas & Merge Multiple Line Breaks

To merge multi-line data into a single line separated by commas, simply type a line break in the "Find" box, and enter a comma `,` in "Replace with" to convert lists into a comma-separated format. This tool fully supports typing real line breaks directly in the text boxes.

Batch Change Case, Title Case, or Toggle Case Instantly

Along with text replacement, you can also format the casing of the final output. The tool supports 5 conversion modes: Lowercase, Uppercase, Title Case (capitalizes core words while ignoring common prepositions, articles, and conjunctions), Capitalize Each Word, and Toggle Case. This saves you from performing secondary edits.

Tips for Batch Find and Replace in Large TXT Files

This tool supports importing and exporting plain text files with any extension. While small files can be copied, pasted, or edited directly, we provide a robust processing mechanism for extremely large files.

Avoid Browser Freezing: Safe Memory Operations

When opening text files from several megabytes to tens of megabytes, rendering hundreds of thousands of lines in DOM can easily cause browser lag or crashes. We strongly recommend **disabling "Show file content in input box"** in the import modal. The program will process find-and-replace silently in memory without rendering the DOM. Once the replacement completion notification appears, simply click the "Download" button to save it smoothly as a new text file.

Supported File Formats and Encoding Fixes

There is no file extension limit. Any data file encoded in plain text (e.g., `.txt`, `.csv`, `.md`, `.html`, `.xml`, `.json`, `.js`) can be read. If you see scrambled characters upon importing, it means the file is not UTF-8 encoded. We recommend using the IT365 Text File Decoder to fix the encoding and save as UTF-8 before importing.

One-Click Automation: Replace and Auto-Copy

To streamline your workflow and avoid tedious clicks, this tool includes automation features for an effortless experience:

Real-time Auto Replace & Auto Copy Settings

By checking **"Auto Replace"**, the system instantly refreshes the results whenever you modify the input text, search queries, or replacements. Checking **"Auto Copy Result"** automatically writes the output to your system clipboard upon calculation.

Automatic Configuration Persistence: Ready to Use

This tool includes configuration persistence. When you adjust checkboxes, casing options, import preferences, or resize the textareas, the system automatically saves them to localStorage. The next time you open the page, all settings are restored, enabling you to process text with simple copy-pastes.

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Find and Replace Text Tool - Features & Capabilities

100% Free & No Sign-up

All features are open to everyone for free. No registrations or accounts are required. Just open the page to use all options.

Multi-Device Compatible

Fully compatible with Windows, macOS, iPhone, and Android devices. Access it anywhere via browser.

Supports File Imports

Import any text or code files directly. Highly optimized for large files to prevent browser freezing.

Auto Setting Persistence

Automatically saves search criteria, checkbox settings, and textarea heights for one-click processing on return.

Smart Case Conversion

Built-in Lowercase, Uppercase, Toggle Case, Capitalization, and Title Case algorithms that ignore minor words.

Char and Line Counters

Real-time counting of total characters and lines for both input and output text, facilitating data verification.

Bi-directional Height Sync

Resize either the input or output textarea, and the other side automatically aligns to maintain a beautiful, symmetric layout.

One-Click Text Download

Directly export the input text or replaced results as a TXT file.