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Text Processing

Text Diff

· Last updated：2025-09-16

Compare two text inputs and show differences

Details

What this tool helps you do

Compares two texts line by line using a longest-common-subsequence diff. Lines prefixed with "-" exist only in the original, "+" only in the modified text, and two spaces mark unchanged lines. With line numbers enabled, each row shows the original and modified line number; a blank column means the line does not exist on that side. CRLF and CR line endings are normalized to LF, and one trailing newline is ignored.

Execution

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Samples

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Written by the Elysia Tools team
Text311
Text Processing185
Diff17

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Text Processing
Input types
textarea, checkbox
Output type
text
Sample coverage
4
API ready
Yes

Overview

Text Diff identifies and highlights the specific additions and deletions between two text inputs, allowing you to visualize changes in a unified diff with + and - lines.

When to use

  • When you need to confirm that two versions of a document are identical
  • When you want to see exactly what was edited between a draft and a final version
  • When troubleshooting configuration files to spot missing or extra lines

How it works

  1. 1Paste your original text into the 'Original Text' field.
  2. 2Paste the updated version into the 'Modified Text' field.
  3. 3Toggle 'Show Line Numbers' if you need to reference specific locations in your text.
  4. 4Review the generated output to identify highlighted changes.

Use cases

  • Comparing two versions of a legal contract or policy document to ensure no unauthorized changes were made.
  • Checking configuration files against a backup to identify why a service might be failing.
  • Reviewing copy edits by comparing the original draft against the revised version.

Compare alternatives

  • Use this if you need to compare three versions of text simultaneously or require advanced features like ignore-whitespace rules and conflict markers.

Who it's for

Best for

  • Quickly identifying additions and deletions between two versions of a document
  • Verifying changes in configuration files or code snippets
  • Comparing two drafts of text for manual review

Not ideal for

  • Complex code merging or conflict resolution
  • Semantic analysis or resume-to-job-description matching

Edge cases & common failures

  • Large text blocks

    Very large inputs may impact browser performance; consider splitting text into smaller, logical sections if the tool becomes unresponsive.

  • Whitespace-only changes

    The tool may highlight lines as different even if only whitespace has changed; verify the output carefully if you are looking for content-only differences.

API & automation

  • Batch jobs

    Call POST https://api.elysiatools.com/en/api/tools/text-diff with your input and get the same result without opening the page — copy-paste curl, fetch and Python examples are on the tool's docs page.

  • AI agents

    Hand an AI agent the machine-readable spec at /ai/en/tools/text-diff.md or connect it through the MCP config on the docs page, and it can call this tool for you.

  • Pipelines & scheduled jobs

    Pipe input straight from a script with the fetch or Python example on the docs page and run the same job on a schedule.

· General API documentation · AI-readable spec (.md)

Examples

1. Comparing Configuration Files

Background

A system administrator needs to verify why a server configuration is failing after a recent update.

Problem

The administrator suspects a typo or missing line in the new configuration file compared to the working backup.

How to use

Paste the backup config into 'Original Text' and the new config into 'Modified Text', then enable 'Show Line Numbers'.

text1: "alpha\nbeta", text2: "alpha\nBETA", showLineNumbers: false

Outcome

The tool highlights the specific line where the new configuration differs, allowing for an immediate fix.

2. Reviewing Document Edits

Background

A writer has received a revised draft of an article from an editor.

Problem

The writer needs to see exactly which sentences were changed or removed without re-reading the entire document.

How to use

Paste the original draft into 'Original Text' and the edited version into 'Modified Text'.

text1: "alpha\nbeta", text2: "alpha\nBETA", showLineNumbers: false

Outcome

FAQ

Does this tool support file uploads?

No, this tool only accepts text pasted directly into the 'Original Text' and 'Modified Text' fields.

Can I ignore whitespace differences?

Spaces and tabs inside lines are significant. CRLF and CR line endings are normalized to LF, and one trailing newline is ignored.

What does the 'Show Line Numbers' option do?

With line numbers enabled, each row shows the original and modified line number; a blank column means the line does not exist on that side.

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