ClarityKitFind a tool
Text utilities

Compare Text

Compare two texts line by line and highlight additions and removals with a readable diff.

Text stays in your browserCopy your result
Text workspace
Text workspace

Edit on the left, review and copy the result on the right.

See the method

Your original text

Runs on your device

Your processed text

Your result

Let’s calculate.

Use the Calculate button to see your result.

Your content is processed locally.

How to use this tool

  1. Enter original text, updated text.
  2. Select Update result to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
Original textKeep the structure and separators shown in the sample. Line breaks are retained in this input.First line Old line
Updated textKeep the structure and separators shown in the sample. Line breaks are retained in this input.First line New line

Result for these sample inputs

  First line
+ New line
- Old line

Processed locally. Review the output before using it.

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Use a longest-common-subsequence comparison. Prefix added lines with +, removed lines with −, and unchanged lines with spaces.

A WORKED EXAMPLE

Changing Old line to New line creates one removal and one addition.

What to keep in mind

Whitespace and capitalization matter. Input line-count product is limited to 250,000 to keep the browser responsive.

Common questions

How does this tool handle my input?

Processing happens in your browser. Your pasted content is not uploaded, included in URLs or stored as a calculation history.

What input should I use?

Original text: use the example already shown, then replace it with your own content. Whitespace and capitalization matter. Input line-count product is limited to 250,000 to keep the browser responsive.

Methodology maintained by ClarityKit. How these tools are built and checked.