🔍 Diff Checker

Paste two versions of your text or code to compare them side-by-side. Changes are highlighted by word or character.

Precision:
Original text
Changed text

Diff Checker

You changed a Spring application.yml between environments, need to show a reviewer what shifted in a PR, or want to confirm two API JSON payloads differ only in timestamps — a side-by-side diff highlights additions, deletions, and edits line by line without installing desktop tools or uploading files to a pastebin.

Read full guide

When a browser diff beats git diff

Not everyone has repo access — product managers, QA, and support engineers often receive two exports and need a quick answer. Pasting into this tool gives immediate visual feedback without cloning a repository or learning patch syntax.

All comparison runs locally, which matters when the text contains internal hostnames, customer data, or license keys you should not paste into random online diff services.

What you can do

  • ✓ Side-by-side comparison
  • ✓ Line-level highlighting
  • ✓ Swap inputs
  • ✓ Works with code & JSON
  • ✓ Instant diff
  • ✓ Client-side only

Examples

Spot a config value change

Original

server:
  port: 8080
spring:
  datasource:
    url: jdbc:postgresql://localhost/dev

Modified (line highlighted)

server:
  port: 8080
spring:
  datasource:
    url: jdbc:postgresql://prod-db.internal/prod

About Diff Checker

Diff Checker compares two blocks of text or code side by side and highlights additions, deletions, and changes line by line.

Use it to review config changes, compare API responses, audit pull requests, or spot differences between JSON, YAML, SQL, or plain text. The diff runs entirely in your browser for fast, private comparisons.

How to use Diff Checker

  1. Paste the original text in the left panel and the modified text in the right panel.
  2. The diff updates automatically as you type.
  3. Green lines are additions, red lines are removals, and yellow marks changes.
  4. Use swap to flip left and right inputs quickly.
  5. Copy the diff output or clear both panels to start a new comparison.

Frequently asked questions

What can I compare?
Any plain text: source code, JSON, YAML, .env files, SQL, logs, or documentation.
Is my text stored on a server?
No. Comparison happens locally in your browser.
Does it support word-level diff?
The tool highlights line-level differences, which works well for code and structured text.
Can I compare large files?
Yes, within browser memory limits. Very large inputs may take a moment to process.