Text Diff Checker
Compare two blocks of text side by side with additions in green and deletions in red, character-level inline highlighting, an ignore-whitespace option, and a count of changed lines.
FreeOnline Tool
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How to Use
- Paste or type the original content into the "Original text" box on the left.
- Paste or type the updated content into the "Modified text" box on the right.
- Click the "Compare" button to show the differences below.
- Red highlighting marks removed content and green highlighting marks added content.
- Tick "Ignore whitespace" to filter out differences caused only by spacing.
Features
- Shows the original and modified text side by side and compares them line by line.
- Marks deleted lines in red and added lines in green so changes stand out.
- Highlights character-level differences within a line for precise inline diffs.
- Offers an ignore-whitespace option so formatting noise does not hide real content changes.
- Reports a summary of how many lines were added and removed.
Use Cases
Assisting a code review
Compare a snippet before and after a change to see exactly what moved, so reviewers can focus on the real modifications.
Confirming configuration changes
Diff two versions of a config file to confirm precisely what changed and catch anything unintended that crept in.
Comparing document versions
Check two drafts of a contract, article, or report to find the paragraphs and wording that changed, useful for legal and editorial work.
Verifying program output
Compare output from before and after a refactor to prove the behavior is unchanged and the two versions match exactly.
FAQ
What kinds of content can I compare?
Any plain text: source code, configuration files, articles, logs, and so on. Binary formats such as images or Office documents need converting to text before they can be compared.
Is it slow on large texts?
The diff runs in your browser and is fast for most cases, up to a few thousand lines. Texts of tens of thousands of lines may lag, so compare them in sections.
How do I compare two files?
Copy the contents of each file into the left and right boxes. For comparing many files at once, a command-line diff or your version control system's diff is a better fit.
Can I compare without regard to letter case?
The comparison is case-sensitive by default. To ignore case, convert both texts to lowercase before pasting them in, or use the tool's ignore-case option if one is offered.