Text Diff Checker
Compare two texts and highlight the differences online. Free, private.
Free · No sign-upHow to use Text Diff Checker
- 1. Paste the original version into the left Original text box and the updated version into the right Changed text box.
- 2. Differences appear automatically as you type, or click Compare. Removed lines are shaded red with a minus sign, and added lines green with a plus sign.
- 3. Tick ignore case or ignore whitespace to skip differences in capitalization or spacing that don’t matter for your comparison.
- 4. Check the summary of additions and deletions; on edited lines, the exact words that changed are highlighted so you can spot every edit quickly.
Frequently asked questions
Is the text diff checker free, and how much text can it compare?
Yes, it’s free with no sign-up. It handles documents with thousands of lines. If both texts are extremely large, it switches to a simpler line comparison that lists removed lines only, so your browser stays responsive.
Is text pasted into the diff checker uploaded?
No. The comparison runs entirely in your browser with JavaScript, so contracts, code and drafts you paste are never sent to GrabCast’s servers or stored. Closing or refreshing the page clears both boxes.
How do I compare two documents for differences online?
Copy the text from each document — Word, Google Docs, a PDF or an email — and paste the older version on the left and the newer one on the right. The checker lines them up in order and highlights every added, removed and changed line, down to individual words.
Can the diff checker ignore whitespace and capitalization changes?
Yes. Tick ignore whitespace to treat runs of spaces and tabs as one space and ignore leading or trailing spaces, and tick ignore case to treat “Apple” and “apple” as the same. The results update immediately when you change either option.
Can I use the text diff tool to compare code?
Yes. Both boxes use a monospace font and compare line by line, which suits source code, JSON, CSV and config files, and edited lines show exactly which tokens changed. There’s no syntax highlighting, and differences appear in a single unified view rather than side by side.
What does the red and green highlighting mean in a text comparison?
Red lines with a minus sign exist only in the original text; green lines with a plus sign exist only in the changed text. When a line was edited, you see both versions, with the specific words that changed shaded darker. Gray lines are unchanged.