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Text Diff & Side-by-Side Comparison Studio

Compare two texts, files, or documents side-by-side. Spot additions, deletions, and character-level modifications in real-time, 100% locally.

Original Text (Source A)

Paste text or drop files (.txt, .json, .xml, .sql, .csv, .pdf, .docx)

📁Drag & Drop file or click to browse

Changed Text (Source B)

Paste text or drop files (.txt, .json, .xml, .sql, .csv, .pdf, .docx)

📁Drag & Drop file or click to browse
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Regex Noise Filtering: Practical Examples

Use these regular expression patterns in the filter input to ignore dynamic data and prevent "fake" differences in your comparison reports.

Timestamps\d{4}-\d{2}-\d{2}[T\s]\d{2}:\d{2}:\d{2}(?:\.\d+)?Z?

Ignores ISO/UTC timestamps in application logs or JSON payloads.

UUIDs / GUIDs[0-9a-fA-F]{8}-(?:[0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}

Filters out randomly generated unique identifiers and transaction IDs.

IPv4 Addresses\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

Ignores server, client, or proxy IP addresses in audit logs.

Hashes (MD5/SHA)\b[0-9a-fA-F]{32,64}\b

Ignores checksums, file hashes, or encrypted passwords.

Emails[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}

Ignores dynamic customer or user email addresses.

Session Tokensey[a-zA-Z0-9_-]+\.ey[a-zA-Z0-9_-]+\.[a-zA-Z0-9_-]+

Ignores JWTs (JSON Web Tokens) or session authorization headers.

Database IDs\b\d+\b

Ignores numerical IDs when comparing logs or SQL tables.

HTML Tags<[^>]*>

Strips out all markup tags to compare raw text content.

Hex Colors#[0-9a-fA-F]{3,6}

Ignores inline hex color codes in CSS or SVG files.

URL Query Params\?[^#\s]*

Filters out tracking query parameters (like UTM tags) in URL lists.

Inline Comments\/\/.*

Ignores single-line code comments in JS, Java, or C++.

Trailing Spaces[ \t]+$

Ignores trailing tabs and spaces at the end of lines.

File Paths(?:[a-zA-Z]:\\|\B)\\[\w\s.]+\\[\w\s.]+|(?:\/\w+)+

Ignores absolute or relative paths in logs or configs (Windows/Unix).

JSON Keys"[a-zA-Z0-9_]+"\s*:\s*

Filters out JSON keys to compare only the raw values.

HTML Attributes\s[a-zA-Z0-9_-]+="[^"]*"

Strips HTML attributes (class, id, href) to compare raw tag structure.

SQL & Block Comments\/\*[\s\S]*?\*\/|--.*

Ignores multi-line SQL comments or C-style block comments.

Overview & Capabilities

Compare two text documents, configuration files, or code snippets with our visual Text Diff & Compare Tool! Featuring side-by-side and unified diff views, character-level inline highlighting, whitespace ignoring options, and line-by-line addition/deletion statistics with complete client-side data privacy.

Tutorial

How to Use

01
Paste your Original Text in the left editor and your Modified Text in the right editor.
02
Select your comparison mode: 'Side-by-Side View' or 'Unified Inline View'.
03
Choose diff granularity: 'Word-by-Word', 'Line-by-Line', or 'Character-by-Character'.
04
Optionally enable 'Ignore Whitespace' or 'Case Insensitive' toggles.
05
Review the highlighted additions (green), deletions (red), and modified lines.
Capabilities

Key Features

Side-by-Side & Unified Diff Modes: Toggle between classic split-screen comparison and Git-style unified inline diffs.
Granular Inline Highlighting: Highlights exact changed characters and words within modified lines.
Whitespace & Case Sensitivity Toggles: Ignore leading spaces, trailing whitespace, or case changes to focus on substance.
Diff Statistics Dashboard: Displays total line additions (+), deletions (-), and percentage similarity.
100% Client-Side Privacy: Document comparisons execute locally in your browser memory without uploading files.
Applications

Common Use Cases

Developers comparing code files, configuration values, or API payloads.
System administrators auditing log files and ignoring timestamp differences.
Content editors comparing drafts, articles, or legal contracts for revisions.
Database administrators comparing SQL schemas or data dumps.
QA engineers verifying localized text files and translation keys.
Guidance

Tips & Best Practices

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Use the 'Ignore Whitespace' option when comparing code or JSON files where indentation difference is not important.
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When analyzing server logs, enter a regex filter (e.g., \d{4}-\d{2}-\d{2}) to ignore timestamp differences and focus only on error messages.
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If comparing JSON files, select the 'JSON' format preset to auto-format and sort keys, preventing mismatched line order from cluttering the diff.
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Use the 'Copy Unified Diff' button to quickly get a standard Git-style patch to share with your team.
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Answers

Frequently Asked Questions

Q How does the text diff algorithm identify changes between two files?

The tool implements the Myers difference algorithm (the foundation of Git diff), which computes the shortest sequence of edit operations (insertions and deletions) required to transform the original text into the modified text.

Q Can I compare code snippets and JSON files?

Yes! The diff tool works flawlessly with source code (JavaScript, Python, C++), JSON structures, Markdown notes, and legal contracts.

Q Is my proprietary text or code saved on your servers during comparison?

No. The entire comparison engine runs 100% locally in your browser's JavaScript sandbox. No text is ever saved or transmitted to external servers.