Advanced Text Tools: Diff, Markdown, JSON & More
Beyond basic text editing lies a world of powerful transformations. Armytool's advanced text tools help developers, writers, and data analysts compare, convert, and clean up text efficiently. All processing happens locally—paste sensitive code or data without worry.
What's Covered
- 1. Text Diff – Compare Two Texts
- 2. Markdown to HTML – Convert with Preview
- 3. JSON Formatter – Validate & Beautify
- 4. Duplicate Remover – Clean Up Lists
- 5. Find & Replace – With Regex Support
1. Text Diff – Compare Two Texts
The Diff tool compares two versions of text and highlights what changed. Essential for code reviews, contract comparisons, version tracking, and any situation where you need to spot differences quickly.
How Diff Works
- − Red lines exist only in the original (removed)
- + Green lines exist only in the modified (added)
- Unchanged lines appear without highlighting
- Line-by-line comparison for clarity
Diff Use Cases
- Code reviews: See what changed between versions
- Legal documents: Compare contract revisions
- Content editing: Track article changes
- Config files: Spot configuration differences
2. Markdown to HTML – Convert with Preview
Convert Markdown formatting to clean HTML with a live preview. Perfect for writing documentation, README files, blog posts, or any content that needs to be published as HTML.
Supported Markdown Syntax
- Headers:
# H1,## H2, through###### H6 - Bold:
**text**or__text__ - Italic:
*text*or_text_ - Code:
`inline` - Lists:
- itemor1. item - Blockquotes:
> quote - Links:
[text](url) - Images:

3. JSON Formatter – Validate & Beautify
Format messy JSON, validate syntax, minify for production, or explore with tree view. The JSON tool is indispensable for developers working with APIs, config files, or data exports.
JSON Operations
- Pretty Print: Indent with syntax highlighting
- Minify: Remove whitespace for production
- Tree View: Collapsible nested structure
- List Keys: Extract all key paths
- Validation: Catch syntax errors instantly
4. Duplicate Remover – Clean Up Lists
Remove duplicate lines from any text list. Useful for cleaning up exported data, deduplicating email lists, removing repeated entries, or preparing unique value sets.
Dedup Options
- Exact match: Removes identical lines only
- Trim + dedup: Trims whitespace before comparing
- Remove blank lines: Filters out empty lines
- Preserves order: First occurrence stays
5. Find & Replace – With Regex Support
Powerful search and replace with optional regular expression support. Replace all occurrences, use capture groups, and handle complex text transformations.
Regex Examples
/\d+/g– Find all numbers/[aeiou]/g– Find all vowels/^Start/gm– Find "Start" at line beginnings/(\w+)@(\w+\.\w+)/g– Find emails with groups- Use
$1,$2in replacement for capture groups
Why Use Armytool Text Tools?
All text processing happens instantly in your browser with zero server round-trips.
- 🔒 Private: Code, credentials, and data stay local
- ⚡ Instant: No upload/download delays
- 🛠 Powerful: Regex, syntax validation, live preview
- 💯 Free: No limits, no watermarks, no signup
Start transforming text! Visit Armytool and explore the Text category. All tools are free, instant, and require no signup.