Text Diff Checker

Track changes between any two pieces of text, code, or configuration. Ideal for pull requests, editorial reviews, legal redlines, and infrastructure auditing.

🚀 Instant Results📱 Mobile Friendly🔒 No Data Stored💯 Completely Free

Compare Text, Code, or Config Files Instantly

Paste two snippets to visualise additions, removals, and unchanged lines with developer-friendly highlights.

Input Texts

Paste content, configuration files, or code snippets. Diff updates automatically as you type.

Original

11 lines

Modified

22 lines

Ignore letter casing

Trim whitespace before diff

Highlight unchanged lines

Copy diff output summary

Diff Output

Added lines glow green, removed lines glow red, unchanged lines stay neutral.

Line

Original

Line

Modified

import { useState, useEffect } from "react"

import { useState } from "react"

export default function Counter() {

const [count, setCount] = useState(0)

const [lastUpdated, setLastUpdated] = useState(new Date())

useEffect(() => {

setLastUpdated(new Date())

}, [count])

return (

<button

className="rounded bg-indigo-600 px-4 py-2 text-white"

onClick={() => setCount((value) => value + 1)}

<button onClick={() => setCount(count + 1)}>

You clicked {count} times

Updated {lastUpdated.toLocaleTimeString()}

</span>

</button>

)

}

Diff Summary

Quick stats for pull requests or QA notes.

Lines added+13

Lines removed-2

Lines unchanged9

Total diff entries24

+ import { useState, useEffect } from "react"
- import { useState } from "react"
  
  export default function Counter() {
    const [count, setCount] = useState(0)
+   const [lastUpdated, setLastUpdated] = useState(new Date())
+ 
+   useEffect(() => {
+     setLastUpdated(new Date())
+   }, [count])
  
    return (
+     <button
+       className="rounded bg-indigo-600 px-4 py-2 text-white"
+       onClick={() => setCount((value) => value + 1)}
+     >
-     <button onClick={() => setCount(count + 1)}>
        You clicked {count} times
+       <span className="block text-xs text-indigo-100">
+         Updated {lastUpdated.toLocaleTimeString()}
+       </span>
      </button>
    )
  }

When to Use a Diff Checker

Code reviews: Verify pull requests before merge without switching contexts.

Copy editing: Highlight editorial changes for stakeholders or clients during revisions.

Config audits: Compare environment variables, YAML manifests, or JSON settings between environments.

Legal and policy updates: Track contractual or documentation changes with clear, color-coded context.

Pro Tips

Normalize whitespace before diffing large data exports to focus on meaningful changes.

Share the copied diff snippet in pull requests, release notes, or incident reports for instant clarity.

Swap the panels to view the inverse diff when generating rollback instructions.

Analyze Textual Changes Without Leaving Your Browser

Whether you review code, legal agreements, marketing copy, or configuration files, understanding what changed saves hours of back-and-forth. Our text diff checker provides clear color-coded highlights, line numbers, and instant summaries that translate directly into pull requests, QA notes, or changelog entries.

What This Tool Helps You Do

Validate pull requests: Spot unintended deletions or additions before merging into main.
Deliver editorial feedback faster: Compare rewrites and send precise comments to writers or translators.
Audit infrastructure changes: Compare environment variables, Terraform files, or Kubernetes manifests between stages.
Document policy updates: Highlight revised clauses in terms of service or privacy policies for legal stakeholders.

Diff Visualization Explained

Each line is categorized as added (green),removed (red), or unchanged (neutral). When you toggle "ignore case" or "trim whitespace" the diff instantly recalculates to emphasise meaningful changes. You can also copy a command-line style diff summary to share in chat or commit messages.

Tips for Cleaner Comparisons

Remove boilerplate headers or timestamps before comparing files.
Normalize line endings if you switch between Windows and Unix.
Compare smaller sections when investigating large repository rewrites.
Use the trimmed-whitespace mode for markdown or HTML edits where spacing is flexible.
Run the diff before and after auto-formatters to confirm formatting-only changes.

Frequently Asked Questions

How is this diff different from Git?

Git excels at repository-wide comparisons but requires a commit. This tool works standalone: paste two snippets from email, CMS exports, or shared documents without touching your repo.

Does the tool handle large files?

For browser performance we recommend up to a few thousand lines—ideal for feature diffs, legal redlines, and infrastructure templates. For binary comparisons consider hashing with our Hash Generator.

Can I export the diff?

Copy the generated summary or take screenshots of the color-coded view. Many users paste the diff output into pull requests or incident docs.

Connect Diff Insights With the Rest of Your Workflow

Clean metadata and tidy payloads go hand-in-hand with accurate diffs. After reviewing text changes, polish your SEO tags using the Meta Tag Generator and validate structured payloads with the JSON Formatter.

Need to benchmark release times or audit log entries alongside your diff? Pair this checker with the Timestamp Converter to translate UNIX values into human-readable schedules instantly.