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Diff Checker

Compare two text files or code blocks instantly. See additions, removals, and modified lines side by side with options to ignore whitespace or case, upload files, and export cleaned comparison data.

Diff Controls

Compare two versions of text, code, or config files with side-by-side output and change summaries.

Best for code review, text comparison, config changes, and diff summaries.
136 chars · 8 lines
151 chars · 9 lines

Unchanged

6

Added

2

Removed

1

Modified

1

Visible rows

10

Side-by-side diff

Compare the left and right inputs line by line.

Left
Content
Right
Content
1
name: SmartTools
1
name: SmartTools
2
version: 1.0.0
2
version: 1.1.0
3
environment: production
3
environment: production
4
features:
4
features:
5
- regex-tester
5
- regex-tester
6
- yaml-json-converter
6
- yaml-json-converter
7
- diff-checker
7
- diff-checker
8
theme: light
8
- jwt-decoder
9
theme: dark

Included features

  • Side-by-side comparison with line numbers.
  • Summary counts for added, removed, modified, and unchanged lines.
  • Ignore whitespace and ignore case options.
  • Optional hiding of unchanged lines.
  • Upload text-based files on both sides.
  • Swap inputs, copy summary, and download full diff report.

What can this diff checker do?

This tool compares two versions of text, code, JSON, YAML, SQL, or configuration files, highlights added and removed lines, summarizes the changes, and lets you upload, copy, or download comparison data.

Common use cases

Use it for code review, config comparison, draft checking, text changes, JSON or YAML updates, migration scripts, and validating edits before deployment or publishing.