Instant Text Comparison — Free Forever
Text Diff Checker
Paste two texts and instantly see exactly what changed — added lines, removed lines, and word-level differences highlighted clearly. No signup, no limits.
100% Free
Instant Results
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Word-Level Diff
Side-by-Side View
Compare Two Texts
How to Use
1. Paste your texts
Put the original (before) text on the left and the modified (after) text on the right.
2. Choose a diff mode
Line — compare line by line. Word — highlights individual word changes inline. Side-by-Side — shows both texts in columns.
3. Set options
Ignore whitespace, case, or blank lines to focus on meaningful changes only.
4. Read the colours
🟢 Green = added 🔴 Red = removed 🟡 Yellow = changed Grey = unchanged
More Text Tools
Common Use Cases
📄 Document RevisionsCompare draft versions of contracts, essays, or reports to see exactly what changed between edits.
💻 Code ReviewSpot changes in code snippets, config files, or SQL queries without a full IDE.
🔍 Content CheckingVerify that copy-edited text matches the original, or find unintended changes from a CMS export.
📊 Data ValidationCompare CSV rows, JSON outputs, or log files line-by-line to find discrepancies.
Frequently Asked Questions
Common questions about text diff and comparison tools.
What is a diff checker?
A diff checker compares two pieces of text and shows exactly what has changed — lines added, removed, or modified. The term "diff" comes from the Unix
diff command, which has been the standard tool for comparing files since the 1970s. Our tool performs the same comparison in your browser.What is the difference between Line and Word diff mode?
Line mode compares whole lines and marks an entire line as added, removed, or changed. Word mode goes deeper — it finds which individual words within each changed line were added or removed, highlighting them inline. Word mode is best for prose editing; Line mode is best for code and config files.
What does "similarity" percentage mean?
Similarity is calculated as the ratio of unchanged lines to total lines across both texts. A 100% similarity means the texts are identical. A 0% similarity means every line is different. It gives you a quick at-a-glance measure of how much the two versions diverge.
Is my text stored or sent anywhere?
The diff comparison is done entirely on our server — your text is sent as a standard form POST to compute the result, but it is not stored, logged, or shared with any third party. No account is required and nothing is saved after your session ends.
What do "Ignore whitespace" and "Ignore case" do?
Ignore whitespace strips leading and trailing spaces from each line before comparing, so indentation differences don't count as changes. Ignore case treats uppercase and lowercase as equal, so "Hello" and "hello" are considered the same. These are useful when you care about content changes, not formatting.