---
title: "Diff Checker | ToolSugar"
description: "Compare two texts line by line or word by word and see exactly what was added or removed. Runs in your browser, nothing is uploaded."
canonical: https://toolsugar.com/tools/diff-checker
image: https://toolsugar.com/og.png
---

# Diff Checker

A diff checker compares two pieces of text and shows what changed. This one works line by line or word by word, counts the additions and removals, and marks them with symbols, underlines and strikethroughs so you can read it without relying on color. It runs in your browser and your text is never uploaded.

Runs on your device

## How it works

1. Paste the old version into Original and the new version into Changed.
2. Choose Line by line or Word by word.
3. Read the summary of added and removed items.
4. Scan the result: lines start with + or -, and words are underlined or struck through.

## Key facts

- **Levels**: Line by line and word by word
- **Not color only**: Added and removed text also use +, - , underline and strikethrough
- **Counts**: Total added and removed lines or word chunks
- **Where it runs**: In your browser, with no upload

## Common uses

- Compare two versions of a config file before deploying.
- Spot the edits between two drafts of a document.
- Check what a formatter or script changed in a block of code.

## Questions

### Does the diff checker send my text anywhere?

No. The comparison runs in your browser tab, so both texts stay on your device.

### When should I use word level instead of line level?

Use word level for prose or long lines where only a few words changed. Use line level for code and lists, where each line is a separate item.

### Can I tell the changes apart without colors?

Yes. Line results begin with + or - and carry hidden labels for screen readers, while word results use underline for added text and strikethrough for removed text.

[Read the Diff Checker guide](https://toolsugar.com/blog/how-to-compare-two-text-files)

## Related tools

- [JSON Formatter](https://toolsugar.com/tools/json-formatter)
- [URL Encoder and Decoder](https://toolsugar.com/tools/url-encoder)
- [AI Token Counter](https://toolsugar.com/tools/token-counter)