Text Difference Checker

How to use

1. Paste your original text in the left panel.
2. Paste the revised version in the right panel.
3. Differences appear automatically below, additions in green, removals in red, unchanged lines shown normally.

Tips for best results

• Format JSON before comparing. If you're comparing two JSON payloads, paste each through the JSON formatter first to normalize whitespace. A single extra space in a minified JSON string marks the entire line as changed, making the diff output nearly unreadable without normalizing first.
• Normalize casing to reduce noise. If two versions of a document use inconsistent capitalization and you only care about content changes, convert both to the same case using the case converter before pasting, this filters out casing-only differences so actual content changes stand out clearly.
• Track word count changes alongside the diff. After reviewing the diff, paste the new version into the word counter to confirm whether additions or deletions moved the total word count out of a required range, useful for SEO meta descriptions, social copy and constrained content fields.
• Use it for line-level contract edits. Paste the old and new versions of a short clause or paragraph side by side to see exactly which characters changed within each line. This works well when edits happen in place; if wording is inserted or removed above the change, everything after it will shift and show as changed too, so compare one paragraph or clause at a time rather than pasting an entire contract at once.

Why use PixMidas

• Instant comparison. No button to press, differences appear as soon as both panels have content.
• Clear color coding. Green for additions, red for removals, unchanged lines in their original color.
• No account needed. Free. Text comparison runs locally on your device.

Frequently asked questions

How does text diff work?

The tool compares the two texts line by line, position by position: line 1 in the original against line 1 in the revised version, line 2 against line 2, and so on. A line is marked changed if it differs from its counterpart at that position, added if the revised version has extra lines, or removed if the original does. This works best for comparing two similar versions where edits happen in place. If a line is inserted or deleted above a change, every line after that point shifts by one position and will show as changed too, even though its content didn't actually move.

Is this line-level or word-level comparison?

The comparison identifies whole lines as added, removed or unchanged. For a line that exists on both sides but differs, it also highlights the change at the character level, showing exactly which characters differ within that line. This is well-suited for code, structured text and documents where line boundaries are meaningful. For comparing JSON or configuration files where whitespace matters, format both documents first using the JSON formatter to ensure consistent indentation before diffing.

What are the most common use cases?

Comparing two drafts of an article to see what an editor changed. Verifying that only approved edits were made to a contract. Reviewing config file changes without a development environment. Checking the difference between two versions of terms, policies or formal documents. Spotting unauthorized changes to web copy. The tool is also useful for academics comparing two editions of a cited source when footnote or wording variations need to be documented precisely.

Is there a character limit?

No enforced limit. Very large texts may cause a slight processing delay but will complete. For most practical document comparison tasks the tool responds instantly. If you're also tracking word count changes between versions, paste each version separately into the word counter and compare the totals alongside the diff output.

Is my text safe?

Yes. Both text inputs stay entirely withon your device. All comparison logic runs locally using JavaScript. Nothing is transmitted to any server at any point. This makes the tool safe for comparing confidential documents, legal contracts, internal policy drafts or any sensitive text, the comparison happens on your device, not on a remote server.