ShethHub

Text Diff Checker

Paste two versions of a text to see what changed, line by line, with the changed words highlighted. Ignore case or extra spaces if they do not matter, then copy or download the result as a standard .diff file. Everything runs locally in your browser; your text is never uploaded.

Runs locally in your browser

How to use Text Diff Checker

  1. Paste both texts. Put the original on the left and the changed version on the right.
  2. Choose options. Tick Ignore case or Ignore extra spaces if those differences do not matter.
  3. Compare. Click Compare to see added lines in green and removed lines in red, then copy or download the diff.

Example

One line replaced and one line added.

Original

apples
bananas
cherries

Changed

apples
blueberries
cherries
dates

Unified diff

--- original.txt
+++ changed.txt
@@ -1,3 +1,4 @@
 apples
-bananas
+blueberries
 cherries
+dates

Formats, limits and privacy

Input
Plain text
Output
Plain text
Limits
  • Compares line by line, then highlights changed words within changed lines.
  • Shows up to 5000 lines of results on the page; the .diff download always has everything.
  • When two texts are almost completely different, the changed part is shown as one removed block and one added block.
Privacy
Everything happens in your browser. Your input is never uploaded to a server.

Troubleshooting

Lines look identical but are marked as changed

They differ in invisible whitespace, such as a trailing space or a tab instead of spaces. Tick Ignore extra spaces.

The whole text shows as changed

One side may be a single long line, or use different line endings after a copy from another app. Check that both texts are split into lines the same way.

patch rejects the downloaded .diff

Apply it to the same original text you compared, with options such as Ignore case off. The file names in the header are original.txt and changed.txt; pass the target file to patch directly.

Frequently asked questions

Is my text uploaded to a server?

No. The comparison runs entirely in your browser; nothing is sent anywhere.

What do "Ignore case" and "Ignore extra spaces" do?

Ignore case treats "Hello" and "hello" as the same. Ignore extra spaces treats runs of spaces or tabs as one space and ignores spaces at the start and end of a line.

What is the .diff download?

A standard unified diff, the format used by git and the patch command, with three lines of context around each change.

Is there a size limit?

No fixed limit, but very large texts depend on your device. When two texts are almost completely different, the changed part is shown as one removed block and one added block to stay fast.