Free Online Text Difference Checker: Compare Text

Introduction

Have two versions of a document and can't tell what changed? Trencada's Text Difference Checker is a free online tool that compares two blocks of text side by side and highlights exactly what was added, removed, or modified — instantly, right in your browser. It's perfect for reviewing document edits, checking revisions, comparing code snippets, or proofreading changes before publishing.

How to Use the Text Difference Checker

Spotting differences takes just seconds:

1. Paste the original text: Enter the older version into the "Original Text" box.
2. Paste the modified text: Enter the newer version into the "Modified Text" box.
3. Set options (optional): Tick "Ignore whitespace" to skip spacing changes, or "Ignore case" to treat "Hello" and "hello" as identical.
4. Click "Compare Text": The tool instantly scans both texts and displays a side-by-side, color-coded comparison.
5. Review the results: Added, Removed, and Unchanged line counts appear at the top. Use "Copy Difference" to copy the results, or "Clear" to start over.

Key Features

• Side-by-side visual diff: Clear red/green highlighting shows exactly what changed.
• Word-level highlighting: Changed words are pinpointed within each line, not just whole lines.
• Smart options: "Ignore whitespace" and "Ignore case" toggles for flexible comparisons.
• Change statistics: Instant counts of added, removed, and unchanged lines.
• Copy the difference: Copy results in a simple diff-style format for reports or documentation.
• 100% private: All comparison happens on your device — your text never leaves your browser.
• Free, no sign-up: No accounts, no installation, no hidden costs.

Why Choose Trencada?

Trencada offers a growing collection of free, privacy-first online utilities that run entirely in your browser — nothing to install, nothing to upload.

• Free: All Trencada tools are completely free to use.
• Private: Your text is processed on your device and never stored on our servers.
• No installation: Works instantly on any device with a modern browser.
• More text tools: Analyze your text with the Word Counter or change letter casing with the Case Converter.

Frequently Asked Questions (FAQ)

Is the Text Difference Checker really free? Yes! Like all Trencada tools, it's completely free with no sign-up required. Does this tool work for comparing programming code? Absolutely! Since it compares plain text, you can paste two versions of HTML, CSS, JavaScript, or any other code to instantly spot bugs, syntax changes, or broken tags. Do you save or store the text I paste into the tool? No. The tool runs entirely in your web browser using JavaScript — your text never leaves your device, is never uploaded, and is never stored on our servers. Can it detect changes in formatting like bold or italic text? No. The tool compares plain text only — words, letters, numbers, symbols, and spacing — and ignores rich-text formatting like bold or italics. What do "Ignore whitespace" and "Ignore case" do? "Ignore whitespace" skips changes in spacing and line breaks, while "Ignore case" treats uppercase and lowercase letters as identical ("Hello" vs "hello" counts as unchanged). Can I copy the comparison results? Yes. Click "Copy Difference" to copy a text summary of the comparison — removed lines marked with "-", added lines with "+" — ready to paste into reports or documents.