What is Indent / Outdent?
The Indent function adds leading whitespace (spaces or tabs) to every line in your text. The Outdent function removes leading whitespace from every line. You can configure the indent width from 1 to 16 spaces and choose between spaces or tabs.
Crucially, the tool preserves relative indentation between lines. If line 3 is indented 4 spaces more than line 2, that relationship stays intact after indenting or outdenting. This makes it safe for code, structured documents, and nested lists.
This tool is essential for:
- Developers adjusting code indentation when copying between editors
- Technical writers formatting code blocks in documentation
- Data engineers reformatting indented data files (YAML, JSON)
- Students fixing indentation in programming assignments
- Content creators formatting blockquotes and nested content
Related: Tabs to Spaces · Add Line Breaks
Why You Need Indent/Outdent in 2026
1. Cross-Editor Code Compatibility
Different code editors use different indentation settings. When copying code between VS Code, Vim, and online editors, indentation often breaks. Indent/outdent instantly normalizes the formatting.
2. YAML and JSON Formatting
Configuration files in YAML and JSON are indentation-sensitive. A single misplaced space can break an entire deployment. This tool lets you shift indentation levels safely without retyping.
3. Documentation Code Blocks
Technical writers embedding code in Markdown or HTML need proper indentation for readability. Outdenting removes unnecessary leading spaces that cause rendering issues in documentation platforms.
4. Collaborative Editing
When multiple contributors edit the same document, indentation styles often clash. A quick indent/outdent pass normalizes the entire document to a consistent style.
5. List Nesting Adjustments
Markdown and outline processors rely on indentation to define list hierarchy. Adjusting indent levels changes nesting depth without rewriting the list structure.
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How to Use: Step-by-Step
Step 1: Paste Your Text
Copy the code, configuration, or document text and paste it into the input area.
Step 2: Configure Indentation
Set the number of spaces (1–16) and toggle "Use tabs instead" if your project uses tab-based indentation.
Step 3: Click Indent or Outdent
Click Indent → to add leading whitespace to all lines, or ← Outdent to remove it. Relative indentation between lines is preserved.
Step 4: Copy the Result
Copy the output from the results area and paste it back into your editor or document.
Real-World Examples
Scenario: A developer pastes a Python function from Stack Overflow, but it has 8 spaces of extra indentation.
Challenge: The code runs but looks wrong in the editor. Manual outdenting 30 lines is tedious.
Solution: Set spaces to 4, click Outdent once. All 30 lines shift left by 4 spaces. The relative nesting between loops and conditionals is preserved.
Scenario: A technical writer needs to indent a 20-line code block to fit inside a Markdown nested list.
Challenge: Adding 4 spaces to each line manually would take minutes and risk typos.
Solution: Set spaces to 4, click Indent. Every line gets exactly 4 leading spaces. The code block now renders correctly inside the nested list.
Scenario: A DevOps engineer receives a Docker Compose YAML file with mixed tab/space indentation that fails validation.
Challenge: The file has 80 lines with inconsistent leading whitespace across nested sections.
Solution: First outdent everything to zero, then indent with 2 spaces to normalize. The YAML validates cleanly on the first try.
Best Practices
1. Match Your Project's Style
Check your project's .editorconfig or style guide before indenting. Most Python projects use 4 spaces; JavaScript and YAML typically use 2.
2. Outdent First for Clean Results
If text has irregular indentation, outdent to zero first, then indent to your target width. This ensures uniform results.
3. Use Tabs for Legacy Projects
Some older codebases still use tabs. Toggle "Use tabs instead" to maintain consistency with existing code.
4. Verify After Bulk Operations
After indenting or outdenting large files, spot-check a few lines to confirm the output looks correct before committing changes.
Frequently Asked Questions
Q: Does this affect relative indentation?
A: No. If line 2 is indented 2 spaces more than line 1, that relationship is preserved after indenting or outdenting.
Q: Can I indent with tabs?
A: Yes, check the "Use tabs instead" option.
Q: Does this tool work offline?
A: Yes, all processing happens in your browser. No internet connection is required after the page loads.
Q: Is there a limit to how much text I can paste?
A: No, you can paste documents of any length.
Q: Is my text stored or sent to a server?
A: No. All processing happens locally in your browser. Your text is never sent to any server.