Text Diff Checker

About the Text Diff Checker

Text Diff Checker compares two blocks of text line by line and shows exactly what was added, removed and unchanged — the same workflow used by Git, Notion and VS Code. The diff runs in your browser using a longest-common-subsequence algorithm, so nothing is uploaded.

How to use

1. Paste the original text on the left.
2. Paste the modified text on the right.
3. Click Compare — added lines are green with a +, removed lines red with a −, and context stays grey.

Benefits & key features

• See changes between drafts of an article, contract or piece of code in seconds.
• Spot exactly what a collaborator edited before accepting their version.
• Works on configs, SQL scripts, CSV exports — anything line-based.
• Summary row shows added/removed/unchanged counts at a glance.

Pro tip

For prose, split long paragraphs into one sentence per line before diffing. Line-based diff flags the whole line if a single word changes — shorter lines give much more useful highlighting.

Why choose toolsfy for Text & Document tools?

Writing tools on the web typically lean toward either "blog-post-assistant with an AI upsell" or "plain counter with zero insight". toolsfy aims for the middle ground: a collection of sharp, single-purpose text utilities that run inline while you draft, with no usage cap and no sign-up. Because every tool is client-side, you can happily paste confidential paragraphs, leaked transcripts or half-finished blog drafts without second-guessing where they end up.

Common use cases

• Students counting words against strict assignment limits while the essay is still being edited, not after it has been submitted.
• Copywriters A/B-testing two versions of a landing page paragraph and checking whether one reads at a different grade level than the other.
• Journalists cleaning up a pasted transcript — removing line breaks, converting case, stripping extra whitespace — before a Ctrl-F search.

Frequently asked questions