Replace Spaces in Text
Advanced space replacer for URLs, filenames, and clean formatting
Statistics
Replace With
Options
Case Transform
Continue with Related Tools
What is Replace Spaces in Text?
Replace Spaces in Text is a versatile string manipulation tool that substitutes space characters with underscores, dashes, or any custom delimiter you choose. Essential for creating safe filenames, URL slugs, programming identifiers (snake_case, kebab-case), and sanitizing text for various technical applications.
If you need to remove other types of whitespace or clean up text generally, try our comprehensive Text Cleaner Tool. To simply remove all newlines and join text, use Remove Line Breaks.
Features
Quick Presets
One-click presets: _ - . + %20 (remove).
Custom Replacement
Replace with any character or string you want.
All Whitespace
Replace tabs, newlines, and all whitespace types.
Remove Special Chars
Keep only alphanumeric and basic symbols.
Case Transform
Convert to UPPER, lower, or Title Case.
100% Private
All processing happens locally in your browser.
Common Use Cases
Safe Filenames
Convert 'My Photo Album.zip' to 'My_Photo_Album.zip'. Operating systems struggle with spaces in filenames. Replace spaces with underscores or dashes to create universally compatible filenames that work across Windows, Mac, and Linux.
URL Slugs
Create SEO-friendly URLs like 'how-to-code-in-python' from 'How to Code in Python'. Use dash preset, enable lowercase and remove special chars to generate clean, readable URL slugs for blog posts and web pages.
Programming
Generate snake_case variables or kebab-case CSS classes. Convert 'User Profile Data' to 'user_profile_data' for Python or 'user-profile-data' for HTML/CSS class names. Perfect for code generation and refactoring.
Example: Create URL Slug
Frequently Asked Questions
How do I replace spaces with underscores?
Simply click the underscore (_) preset button or type underscore in the custom replacement field. Every space in your text will instantly be replaced with an underscore. For example, 'My File Name' becomes 'My_File_Name'. This is perfect for creating programming variables, filenames, or database field names.
How do I create URL-friendly slugs?
Click the dash (-) preset to replace spaces with hyphens, enable 'Remove Special Chars' to strip punctuation, and select 'lowercase' case transform. For example, 'How to Code in Python!' becomes 'how-to-code-in-python'. This creates clean, SEO-friendly URL slugs.
Can I replace spaces with nothing (remove them)?
Yes! Click the '(remove)' preset button or clear the custom replacement field to leave it empty. This removes all spaces completely. For example, 'hello world' becomes 'helloworld'. Useful for creating compact identifiers or hashtags.
What does match all whitespace do?
When enabled, this option replaces not just regular spaces, but also tabs, newlines, and all other whitespace characters. By default, only space characters ( ) are replaced. Enable this to handle text copied from formatted documents or code that contains various types of whitespace.
How do I create safe filenames?
Use the underscore (_) or dash (-) preset, then enable 'Remove Special Chars' to strip unsafe characters like quotes, slashes, and brackets. This keeps only letters, numbers, and basic punctuation (- _ .), creating filesystem-safe filenames from any text.
Can I replace spaces with multiple characters?
Yes! The custom replacement field accepts any text, not just single characters. For example, you can replace spaces with ' | ' (space-pipe-space) or '->' or any other string. Simply type your desired replacement in the custom field.
What is the %20 preset for?
The %20 preset is for URL encoding. In URLs, spaces are encoded as %20. This converts 'hello world.html' to 'hello%20world.html', creating properly encoded URLs. This is the standard way spaces appear in web addresses.
What does remove special chars do?
This option removes or replaces all characters except letters, numbers, and basic symbols (- _ .). It's perfect for sanitizing text for use in programming, filenames, or databases where special characters might cause errors. Punctuation, quotes, brackets, etc. are replaced with your chosen replacement character.
Can I change the case while replacing spaces?
Yes! The Case Transform options let you convert to UPPERCASE, lowercase, or Title Case while replacing spaces. For example, replace spaces with dashes and select lowercase to convert 'My Project Name' to 'my-project-name' in one step.
Is my text safe and private?
Yes, 100% safe. This tool runs entirely in your web browser using client-side JavaScript. Nothing you type or paste is ever sent to our servers or stored anywhere. All text processing happens locally on your device.