Free, browser-based utilities for everyday developer workflows

Diff Two Text Files

Compare two text files and highlight line-by-line differences.

Try it now

Open Text Diff with a ready-to-run example.

Try it now
When you need this
  • You want to compare config files or release notes.
  • You need a quick diff without using git tools.
  • You are reviewing changes before sharing them.
How to do it with Daily Developer Tools
  • Paste the original text on the left and the updated text on the right.
  • Click Compare text to see line-by-line changes.
  • Copy the unified diff output if needed.
Tips / common pitfalls
  • Enable word diff to highlight small edits.
  • Turn on ignore whitespace for formatting-only changes.
  • Use the Copy Added/Removed buttons to extract changes.
Examples & test data

Config updates

Open tool with this example
Input example (List 1)
ENV=prod
TIMEOUT=30
RETRY=2
Input example (List 2)
ENV=prod
TIMEOUT=45
RETRY=3
Expected output
- TIMEOUT=30
+ TIMEOUT=45
- RETRY=2
+ RETRY=3

Version bump

Open tool with this example
Input example (List 1)
version=1.4.2
name=daily-tools
Input example (List 2)
version=1.5.0
name=daily-tools
Expected output
- version=1.4.2
+ version=1.5.0
FAQ
Does it support large files?

Yes, but very large files may take longer to compare in the browser.

Can I ignore whitespace differences?

Yes. Toggle the Ignore whitespace option.

Is the diff saved anywhere?

No. Everything stays in your browser session.

Can I copy a unified diff?

Yes. Use the Copy Unified Diff button.

Related tools
JSON Diff List Comparator Regex Tester Line Tools

Privacy-first: runs locally in your browser. No uploads.

How to use Diff Two Text Files

Paste the original text into the left panel and the revised text into the right panel, then click Compare. Added lines are shown in green, removed lines in red, and unchanged lines in neutral — giving you a clear line-by-line diff.

Common use cases

Developers use this to compare configuration file versions during deployments without needing git. Technical writers use it to review documentation edits, and QA engineers use it to compare expected versus actual output in test logs and reports.

Why run this in your browser?

All processing happens locally in your browser. Your data never leaves your machine, making it safe for sensitive payloads, internal API responses, and confidential configurations.