Text Diff Checker

Compare two texts line by line and see what changed

calendar_today Last updated: September 17, 2026

Original

Changed

Ignore leading and trailing spaces Ignore letter case

Added

Removed

−2

Unchanged

Differences

1		−	الإصدار الأول
	1	+	الإصدار الثاني
2	2		سطر لم يتغيّر
3		−	سطر سيُحذف

Compared in your browser — neither text is uploaded, which matters when the thing you are diffing is a contract or a config.

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Sahel's diff checker compares two texts line by line — added, removed and unchanged — with optional whitespace and case folding, and runs in your browser.

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How does this tool work?

Paste both texts

The original on one side, the changed one on the other.

Set what to ignore

Edge whitespace or letter case, if they are not the point.

Read the differences

Every added or removed line is coloured, with a count for each.

Frequently asked questions

Are the texts uploaded? expand_more

No. The comparison runs in your browser, which matters precisely because what people diff is usually a contract, a config or something else that should not be uploaded.

Why is a changed line shown as removed and added rather than “modified”? expand_more

Because the comparison works a line at a time: any change inside a line makes it a different line. Showing both makes the difference literally visible instead of hiding it.

Why ignore whitespace? expand_more

A trailing space changes a line technically without changing its meaning. Ignoring it surfaces the real differences instead of formatting noise — which is why it is on by default.

Is there a size limit? expand_more

Yes, five thousand lines per side. The comparison grows quickly with length, and past that the page would freeze rather than finish.

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