Overview
Introduction
Turning a sentence or phrase into a slug, filename, or identifier usually starts with getting rid of literal spaces.
This tool does that in one step, and runs entirely client-side, so nothing you paste is ever uploaded to a server.
What Is Space Replacer?
A find-and-replace tool specialized for the space character: it swaps every literal space in your text for a replacement string you choose.
It's part of this site's String Tools collection and works entirely in your browser.
How Space Replacer Works
The tool splits the input on the space character and rejoins the pieces using your replacement string in place of each gap.
The transformation happens synchronously in JavaScript the moment you type, with no network round trip involved.
When To Use Space Replacer
Use it when you need to convert a phrase into a slug-like token, such as turning 'my file name' into 'my_file_name'.
It's also handy for quickly building identifiers, tags, or filenames out of freeform text.
Often used alongside Whitespace Trimmer.
Features
Advantages
- Works with any replacement string, not just a fixed underscore.
- Simple, predictable, single-character-class replacement.
Limitations
- Only targets the literal space character; other whitespace like tabs and newlines are untouched.
- Doesn't lowercase or otherwise sanitize the text, unlike a full slugify tool.
Examples
Best Practices & Notes
Best Practices
- Use Slugify a String instead if you also need lowercasing and character sanitization for URLs.
- Choose a replacement that won't collide with characters already in your text if the result needs to be reversible.
Developer Notes
The implementation is `input.split(" ").join(replacement)`, which handles any replacement string (including a multi-character one or an empty string) without regex escaping concerns.
Space Replacer Use Cases
- Converting a phrase into a slug-like token
- Building a filename out of freeform text
- Creating an identifier from a multi-word label
Common Mistakes
- Expecting tabs or newlines to also be replaced; only literal spaces are affected.
- Using this for URL slugs when full slugification (lowercasing, removing special characters) is actually needed.
Tips
- Combine with a case converter afterward if you want a fully normalized slug, like lowercase with underscores.