⚡
SmartTools
Daily Browser Toolbox
My ToolsFavoritesPDFImageExcel & CSVCalculatorsDeveloperFileDateBeautifierGames

Diff Checker Online

Compare text, code, and files side by side. Detect added, removed, and modified lines instantly with a fast browser-based diff checker.

Browser-basedFree toolNo signupFast comparison

Diff Checker Controls

Compare two versions of text, code, JSON, YAML, SQL, logs, or configuration files with side-by-side line differences and a downloadable report.

Supported files: TXT, JSON, YAML, XML, SQL, JS, TS, TSX, CSS, HTML, MD, LOG, CSV, ENV. Max 5 MB per file.

Paste text/code or drop a text-based file here.

136 chars · 8 lines

Paste text/code or drop a text-based file here.

151 chars · 9 lines

Side-by-side Diff

Compare the left and right inputs line by line with highlighted added, removed, and modified rows.

AddedRemovedModified
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

File and Comparison Details

Left file
Pasted/sample text
Right file
Pasted/sample text
File size limit
5 MB per file
Displayed rows
10

How to Use Diff Checker

  1. Paste or upload left and right content
  2. Select options like ignore whitespace or case
  3. Review differences side by side
  4. Copy or download the report

Side-by-side comparison

View differences clearly with aligned line numbers and highlights.

Smart diff engine

Detect added, removed, and modified lines intelligently.

Download reports

Export comparison results for debugging or sharing.

Use Cases

  • Code reviews
  • Configuration comparison
  • JSON / YAML changes
  • Document version tracking

Important Note

Always review differences before using them in production. Avoid pasting sensitive data.

Related tools

Try other useful SmartTools that are related to this tool.

Text Compare Tool

Compare two text files or text blocks with highlighted differences, side-by-side view, and downloadable reports.

Open tool →

JSON Compare Tool

Compare two JSON files or JSON strings with structural diff, key-path changes, validation, and side-by-side output.

Open tool →

XML Compare Tool

Compare two XML files or XML strings with validation, normalized comparison, highlighted differences, and side-by-side output.

Open tool →

Base64 Encoder / Decoder

Encode and decode Base64 with text and file support, URL-safe mode, copy, download, and instant output.

Open tool →

URL Encoder / Decoder

Encode and decode URL strings with text and file support, plus-sign handling, copy, download, and instant output.

Open tool →

YAML ↔ JSON Converter

Convert YAML to JSON and JSON to YAML with validation, file upload, swap mode, copy, download, and error highlighting.

Open tool →