Compare two versions of a text and see exactly what changed. Additions are highlighted in green and removals in red, line by line, with a summary of how many lines were added, removed or kept. Perfect for code reviews and copy edits.

Line-by-line diff

Add / remove summary

Ignores nothing by default

Private and instant

Use the tool now Step by Step

Trusted & free

It is completely free, private and requires no signup.

IDs are not secrets

A UUID identifies a record — never use it as an authentication token.

Use crypto randomness

Math.random() is predictable. Use the CSPRNG for tokens, IDs and secrets.

Never trust a JWT blindly

Decoding is not verifying. Always validate the signature and claims on the server.

Keep secrets out of code

Generate keys here, then store them in environment variables or a vault.

How it works

Put the first version of the text in the left panel.

Put the second version in the right panel — the differences appear immediately.

Read the highlighted lines and the summary to confirm nothing was missed.

Examples & Data

Before	After	Result
Hello world	Hello brave world	1 changed line
a\nb\nc	a\nc	1 line removed

Use it before committing, after merging or when proofreading.

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camelCase, snake_case, kebab-case, Title & slug

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Words, characters, sentences and reading time

Ready to try it?

It is completely free, private and requires no signup.

Use the tool now

100% Free No signup Private & secure

Help Center

Frequently Asked Questions

It computes the longest common subsequence of lines, then marks the rest as added or removed. It compares line by line, exactly like Git.

By default it compares whole lines, which is the most useful view for code and structured text.

No. Both texts stay in your browser and are never uploaded or logged.

Bright Coding Network

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