Replace Spaces in Text
Swap spaces (or all whitespace) for a character of your choice. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Replace Spaces in Text
- 1. Paste text with spaces to swap. Paste any text into the input pane, such as a filename you typed with spaces or a phrase you want to turn into a slug.
- 2. Choose the replacement and whitespace scope. Type the character to use in Replace each space with, often an underscore or hyphen, and enable Also replace tabs and newlines to catch every kind of whitespace, not just spaces.
- 3. Copy the converted text. Copy the result, now free of plain spaces, and paste it wherever spaces would cause problems, such as a filename, URL slug or variable name.
When to use Replace Spaces in Text
Replace Spaces in Text swaps every space, or optionally every whitespace character, for a symbol of your choice. It's the quick fix for the many places spaces aren't welcome: filenames, URLs, and identifiers.
- Turning a title into a filename. You have a document title like 'quarterly report draft' and need it as a filename with underscores instead of spaces so it saves cleanly across operating systems.
- Building a URL slug. A blog post title needs to become a URL-friendly slug, and replacing spaces with hyphens is the first step before the rest of the slugging happens.
- Sanitizing a variable or identifier name. Text copied from a spec document has spaces where a programming identifier can't have any, so swapping spaces for underscores makes it usable as a variable name.
Examples
Spaces to underscores
Input
hello world
Output
hello_world
About the Replace Spaces in Text tool
Replace Spaces in Text does its work locally, right in the browser. Swap spaces (or all whitespace) for a character of your choice. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Text Tools collection on EditSafely, a set of 211 small, focused Text utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including Replace each space with and Also replace tabs and newlines, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Replace Spaces in Text free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.