Side by Side or Inline
See the two versions in columns, or every addition and removal stacked in a single list, your choice.
Diff Checker
Compare two blocks of text in your browser and see exactly what changed, line by line. View the differences side by side or inline, and ignore case or whitespace. Free, no signup, nothing uploaded.
Guide
How to use the diff checker
1
Paste Both Texts
Put the original on the left and the changed version on the right. The differences appear as you type.
2
Choose a View
Switch between side by side, which shows the two versions in columns, and inline, which lists every change in one column.
3
Fine-Tune the Match
Turn on ignore case or ignore whitespace if you only care about real content changes, not formatting.
Spot Every Change at a Glance
Comparing two versions of something by eye is slow and unreliable. A moved line, a changed word, or an extra space is easy to miss when you are reading two blocks of text back and forth, and missing one can mean shipping the wrong version.
This diff checker does the comparison for you. It lines up the two texts, works out which lines were added, removed, or kept, and colors them so the changes are obvious. Added lines show in green, removed lines in red, and everything that stayed the same fades into the background.
You decide how strict it is. View the result side by side to keep the two versions in context, or inline to read the changes as a single list. Turn on ignore case or ignore whitespace when only the real content matters. Because it runs in the browser, you can compare private files, contracts, or code without sending them anywhere.
Benefits
Why Use Our Diff Checker?
Clear Color Coding
Added lines are green, removed lines are red, and unchanged lines stay plain, so changes jump out.
Ignore Case or Whitespace
Skip differences that are only about capitalization or spacing so you focus on the content that matters.
Change Count
A running tally shows how many lines were added and removed, or tells you the two texts are identical.
Live Comparison
The diff updates as you type or paste, so there is no button to press and no waiting.
Runs in Your Browser
Both texts are compared on your device. Nothing is uploaded, logged, or stored.
Explore More
Similar Tools
More Developer tools you might find useful.
FAQ
Frequently Asked Questions
Common questions about comparing text.
What does the diff checker compare?
It compares the two texts line by line and shows which lines were added, removed, or left unchanged between the original and the changed version.
What is the difference between side by side and inline?
Side by side shows the two versions in two columns, with each line lined up against its counterpart. Inline lists every change in a single column, marking removed lines with a minus and added lines with a plus.
What do ignore case and ignore whitespace do?
Ignore case treats uppercase and lowercase as the same, so Hello and hello match. Ignore whitespace collapses extra spaces and tabs, so lines that differ only in spacing are treated as equal.
Can I compare code?
Yes. The tool works on any plain text, including source code, config files, logs, and documents. It compares whole lines, which suits code and structured text well.
Is there a size limit?
It compares up to a few thousand lines per side quickly. Very large files, over five thousand lines each, are better split into smaller sections for a fast result.
Is this diff checker free?
Yes, it is completely free with no signup and no limits. Everything runs in your browser, so both texts stay on your device.