Whitespace Visualizer Free Online Tool 2026

Last updated March 22, 2026

What Does the Whitespace Visualizer Do?

The Whitespace Visualizer makes invisible whitespace characters visible — spaces, tabs, newlines, non-breaking spaces, zero-width characters, and more. It's essential for debugging Python indentation errors, mixed line endings, trailing spaces, and hidden Unicode characters that cause mysterious behavior.

Whitespace Symbol Legend

Symbol  Character              Unicode   Description
------  ---------              -------   -----------
·       Regular space          U+0020    Standard space
→       Tab                    U+0009    Horizontal tab
↵       Line feed (LF)         U+000A    Unix newline
↩       Carriage return (CR)   U+000D    Old Mac newline
↵↩      CRLF                   U+000D+A  Windows newline
·       Non-breaking space     U+00A0    Looks like space, isn't
​       Zero-width space       U+200B    Completely invisible
‌       Zero-width non-joiner  U+200C    Invisible
‍       Zero-width joiner      U+200D    Invisible (used in emoji)
 ·      En space               U+2002    Wider than regular space
  ·     Em space               U+2003    Even wider

Python Indentation — Mixed Tabs and Spaces

Input code (looks correct in editor):
def calculate(x):
    if x > 0:
        return x * 2
	return -x

With whitespace visualized:
def·calculate(x):↵
····if·x·>·0:↵
········return·x·*·2↵
→return·-x↵

Problem identified:
  Line 4 uses TAB (→) for indentation
  Lines 2-3 use SPACES (····) for indentation
  Python 3 raises: TabError: inconsistent use of tabs and spaces

Fix: Replace tab with 4 spaces on line 4

Trailing Whitespace Detection

Input (trailing spaces invisible in editor):
function hello() {   
  console.log("Hello");   
}   

With whitespace visualized:
function·hello()·{···↵
··console.log("Hello");···↵
}···↵

Trailing spaces found:
  Line 1: 3 trailing spaces
  Line 2: 3 trailing spaces
  Line 3: 3 trailing spaces

Why this matters:
  - Causes test failures in many testing frameworks
  - Creates noisy git diffs (whitespace-only changes)
  - Violates most linting rules (ESLint, Prettier)
  - Can break YAML parsing in some cases

Mixed Line Endings

Input file (mixed CRLF and LF):
Line 1 (Windows)
Line 2 (Unix)
Line 3 (Windows)

With whitespace visualized:
Line·1·(Windows)↵↩
Line·2·(Unix)↵
Line·3·(Windows)↵↩

Problem: Mixed line endings
  Lines 1, 3: CRLF (Windows) ↵↩
  Line 2:     LF (Unix) ↵

Why this matters:
  - Git shows entire file as changed when line endings differ
  - Some tools fail to parse files with mixed endings
  - Shell scripts with CRLF fail on Linux/macOS

Fix options:
  Convert all to LF:   sed -i 's/\r//' file.txt
  Convert all to CRLF: unix2dos file.txt
  Git config:          git config core.autocrlf true (Windows)
                       git config core.autocrlf input (Mac/Linux)

Non-Breaking Space Detection

Input (copied from a Word document):
Hello World

With whitespace visualized:
Hello·World

Wait — that looks normal. Let's check the character:
Hello[U+00A0]World

Non-breaking space (U+00A0) found between "Hello" and "World"!

Why this matters:
  - Looks identical to regular space in most editors
  - NOT treated as whitespace by many parsers
  - Causes string comparison failures:
    "Hello World" === "Hello World"  →  FALSE ✗
    (one has U+0020, other has U+00A0)
  - Breaks word-wrap in some contexts
  - Often appears in content copied from Word, PDFs, or web pages

Fix: Replace U+00A0 with regular space U+0020

Zero-Width Character Detection

Input (looks like "admin" but isn't):
admin

With whitespace visualized:
a​d​m​i​n

Zero-width spaces (U+200B) found between every character!

This is a security concern:
  "admin" (with ZWS) !== "admin" (without ZWS)
  Can be used to bypass username filters
  Can create visually identical but technically different strings
  Used in phishing attacks with lookalike domain names

Detection in JavaScript:
  const hasZeroWidth = /[\u200B\u200C\u200D\uFEFF]/.test(text);
  
  // Remove zero-width characters
  const cleaned = text.replace(/[\u200B\u200C\u200D\uFEFF]/g, '');

YAML Indentation Debugging

Input YAML (fails to parse):
services:
  web:
    image: nginx
	ports:
      - "80:80"

With whitespace visualized:
services:↵
··web:↵
····image:·nginx↵
→ports:↵
······-·"80:80"↵

Problem: Line 4 uses TAB (→) instead of spaces
YAML does not allow tabs for indentation

Fix: Replace tab with 4 spaces:
services:↵
··web:↵
····image:·nginx↵
····ports:↵
······-·"80:80"↵

Removing Whitespace Issues in Code

// JavaScript — remove various whitespace issues
function cleanText(text) {
  return text
    .replace(/\u00A0/g, ' ')           // non-breaking space → space
    .replace(/[\u200B-\u200D\uFEFF]/g, '') // zero-width chars → remove
    .replace(/\r\n/g, '\n')            // CRLF → LF
    .replace(/\r/g, '\n')              // CR → LF
    .replace(/[ \t]+$/gm, '');         // trailing whitespace → remove
}

// Python — strip all whitespace variants
import re
import unicodedata

def clean_text(text):
    # Normalize unicode whitespace
    text = unicodedata.normalize('NFC', text)
    # Remove zero-width characters
    text = re.sub(r'[\u200b\u200c\u200d\ufeff]', '', text)
    # Replace non-breaking spaces
    text = text.replace('\u00a0', ' ')
    # Normalize line endings
    text = text.replace('\r\n', '\n').replace('\r', '\n')
    return text

Common Use Cases

• Debugging Python IndentationError from mixed tabs and spaces
• Finding trailing whitespace causing test failures
• Identifying mixed line endings causing git diff noise
• Detecting non-breaking spaces in content copied from Word/PDF
• Security: finding zero-width characters in usernames or URLs
• Debugging YAML and Makefile indentation issues