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Compare two texts and find differences
100% Private - Files Processed Locally
Your files never leave your device
A diff checker compares two versions of the same text and shows exactly what changed between them. Added content appears in green, removed content in red, so you can review edits at a glance instead of reading both versions side by side.
Developers use it to review code changes before a merge or pull request. Editors use it to track revisions in articles and documents. Anyone working with configuration files, JSON, or plain text can use it to catch unintended edits.
EasyToolsBox Diff Checker compares the two inputs with a longest-common-subsequence algorithm. Content that appears only in the new version is marked as added, content that appears only in the old version is marked as removed, and everything else stays unchanged.
All processing happens locally in your browser. Your text never leaves your device, so you can diff sensitive code, credentials, or confidential documents without uploading them anywhere.
You can switch between three comparison granularities. Word mode compares text word by word and is a good balance of detail and readability. Character mode highlights edits within words, useful for finding small typos or punctuation changes. Line mode compares whole lines and is easiest to read for code, lists, and structured content.
Turn on Ignore Case to treat "Hello" and "hello" as identical, or Ignore Whitespace to ignore differences in spacing and line breaks. After comparing, the statistics show how many items were added, removed, and changed overall, plus a similarity percentage from 0% to 100%.
Your text is compared entirely in your browser and never uploaded, so sensitive code and documents stay private.
Switch between word-level, character-level, and line-level comparison to match your content.
See how many items were added or removed, plus an overall similarity percentage from 0% to 100%.
Ignore Case treats "Hello" and "hello" as identical. Ignore Whitespace ignores differences in spacing and line breaks.
Use it without an account or sign-up. There is nothing to install.
Monospace output keeps indentation intact for code, JSON, YAML, and config files.
Compare draft versions of articles, blog posts, or marketing copy to see exactly what changed between revisions.
Check whether text has been copied or lightly modified. The similarity score shows how much two texts share.
Review changes in contracts, policies, or legal documents. Line mode is useful when every line matters.
Compare original and revised translations to ensure accuracy and consistency across translators.
While developers have Git, this tool works well for quick text-based code comparisons without version control.
Compare two versions of your content to track edits and revisions.
Diff checkers are used for comparing code changes, reviewing document revisions, tracking changes in configuration files, and merging content from multiple sources.
The algorithm compares each line of text between the two inputs. Lines that exist in the new version but not the old are marked as added. Lines removed from the old version are marked as removed.
Yes! Our diff checker works great for comparing code snippets, configuration files, and any text-based content. The colored output makes changes easy to spot.
The tool can handle texts of reasonable size (up to several thousand lines). Very large files may slow down your browser.
Yes. Comparison happens locally in your browser. The text you paste is never sent to a server, which makes the tool suitable for sensitive code and documents.
An added line exists in the modified version but not in the original and is shown in green. A removed line exists in the original but not in the modified version and is shown in red.
This version compares pasted text. To compare files, copy each file's contents into the two input boxes.
Developers reviewing code changes, writers tracking revisions, QA engineers verifying edits, and anyone merging content from multiple sources.
Word mode compares text word by word - a readable middle ground. Character mode highlights edits inside words, catching typos and punctuation changes. Line mode compares whole lines and is easiest for code and structured content.
The similarity score is based on the longest common subsequence of the two texts: 2 x matching tokens / (old tokens + new tokens). Identical texts score 100%, completely different texts score 0%.
Compare two texts and find differences
Paste text into the two boxes above to see the differences in real time.