Text Compare

Compare two texts side by side and highlight the differences line by line. The Word Counter shows length for either version, and the Case Converter normalises capitalisation before comparing.

Text 1

Text 2

What This Tool Does

Compares two text blocks side by side and highlights additions, deletions, and unchanged lines — like a diff tool for plain text, running entirely in your browser.

Who This Is For

Developers comparing two versions of a config file, document, or code snippet
Technical writers reviewing edits between two drafts of documentation
Anyone who needs to identify what changed between two versions of a text without using Git
QA engineers comparing expected vs. actual output in test results

Example: Input: Two versions of a JSON config file or a contract paragraph → Output: A side-by-side diff view with additions in green, deletions in red, and unchanged lines in grey — showing exactly what changed

💡 Text comparison is often a prerequisite before editing. Once you've identified the differences, use the Case Converter to normalize casing across both versions, or the Word Counter to check the final length. For generating test content to compare against, Lorem Ipsum produces text at any length.

How to Compare Two Texts Online

Paste your original text in the left panel and the revised version in the right panel, then click Compare. Differences are highlighted immediately — additions in green, deletions in red, and unchanged text in normal formatting.

Paste the original (older) text into the left panel
Paste the revised (newer) text into the right panel
Click "Compare" to run the diff
Green highlights show added text; red shows removed text
Use character-level or word-level diff mode depending on your needs

Line Diff vs Word Diff vs Character Diff

Different diff modes reveal different levels of change:

Mode	Shows	Best For
Line diff	Which lines changed	Code files, configuration files
Word diff	Which words changed within lines	Documents, articles, prose
Character diff	Exact character-level changes	Short strings, typos, data

For most document editing use cases, word-level diff gives the most readable output. For code, line diff is standard because indentation and whitespace are meaningful.

Common Uses for Text Comparison

Document revision tracking — compare two versions of a contract, proposal, or policy document to see exactly what changed between drafts.
Code review — spot the difference between two versions of a function or configuration block when version control diff output is unavailable.
Plagiarism checking — compare submitted work against source material to identify copied content and paraphrasing.
Database record comparison — paste two JSON records or CSV rows to find which fields differ.
Translation verification — compare a source text against a back-translation to verify accuracy.
SEO and content updates — verify that edits to published pages match the intended changes before and after deployment.
Proofreading — compare a proofread version against the original to confirm all corrections were applied correctly.

Tips for Accurate Text Comparison

Normalize whitespace first — extra spaces, tabs, and line endings can generate false positives. Paste plain text rather than rich text when possible.
Remove formatting — copying from Word or PDFs sometimes adds hidden characters. Use a plain text editor to paste and clean first.
Compare specific sections — for long documents, comparing individual sections gives cleaner, more actionable results than diffing entire documents.
Case sensitivity — if your comparison is case-insensitive (comparing URLs, SQL, or usernames), use a case-insensitive mode if available.

Text Analysis Workflow

Text comparison is most effective when combined with these tools:

Count words in each version before comparing to see length differences
Normalize text case before comparing to remove case-only false positives
Format JSON before comparing two JSON versions
Format HTML before comparing two HTML files — indentation differences create noise

Frequently Asked Questions

What diff algorithm does the tool use?▼

The tool uses a line-by-line diff algorithm similar to the Unix diff command. Added lines are shown in green, removed lines in red, and unchanged lines in grey. Inline character-level highlighting shows exactly which words changed within a modified line.

Is there a text length limit?▼

There is no enforced limit. Very long documents (10,000+ lines) may produce slower diff rendering, but the comparison itself is not size-limited.

Can I compare two files instead of pasting text?▼

Upload files using the file upload option, or open each file in a text editor, select all, and paste into the respective panels. The tool accepts any plain text content.

Why are some differences not showing?▼

If texts appear identical but the diff shows differences, the cause is usually invisible characters — different line endings (Windows CRLF vs Unix LF), Unicode characters that look the same but have different code points, or trailing spaces. Enable 'Show whitespace differences' to reveal these.

Can I format the HTML or format the JSON first so indentation differences do not obscure real changes?▼

Yes — the text compare tool works well for code comparison. Paste the two versions of a file into the panels. For programming-specific features like syntax highlighting or structured diffs, a dedicated code diff tool provides better context.

Does the tool save my text?▼

No — all comparison runs in JavaScript in your browser. Neither text input is uploaded or stored anywhere. Closing the tab clears everything.

Is it case sensitive?▼

Yes. 'Hello' and 'hello' are treated as different.

How It Works

Paste text into both panelsPaste the original text in the left panel and the modified version in the right panel.

View the diffAdded lines are highlighted in green, removed lines in red. Changed sections are highlighted inline.

Navigate differencesUse the Previous/Next buttons to jump between changed sections in long documents.

When to Use This Tool

→Comparing two versions of a document to see what changed between drafts
→Verifying that a translation or paraphrase preserves the original meaning
→Identifying differences between two configuration files or code snippets
→Checking that copy-paste produced an exact copy of a block of text

🔒 Privacy & Security

Text comparison runs in your browser using a JavaScript diff algorithm. No text is uploaded. For comparing contracts, legal documents, or confidential drafts, local diffing means the content never reaches a third-party server.

You Might Also Need

Word Counter →Case Converter →Lorem Ipsum →