How to Convert Tabs to Spaces Online (Step by Step)

To convert tabs to spaces, paste your code into a tabs-to-spaces tool, set how many spaces each tab should become (usually 2 or 4), and copy the space-indented result. The conversion is instant and runs entirely in your browser, so proprietary source never leaves your machine.

Mixed tabs and spaces are one of the quietest causes of broken diffs, misaligned code, and "works on my machine" formatting bugs. This tutorial shows exactly how to normalise indentation to spaces in a few clicks.

What the converter does

A tab character is a single byte that editors render as a variable width — 2, 4, or 8 columns depending on settings. That is why the same file can look perfectly aligned for you and ragged for a teammate. Converting each tab to a fixed number of space characters removes the ambiguity: the file now looks identical everywhere, in every editor, terminal, and code review.

The tool replaces tab characters only. Your line breaks, existing spaces, and the actual text of your code are preserved exactly, so nothing about the logic or content changes — just the indentation whitespace.

Step-by-step conversion

1. Paste your tab-indented text or code into the input box.
2. Set how many spaces each tab should become. Pick 2, 4, 8, or any custom number that matches your project's style guide.
3. Optionally enable "Leading tabs only." This converts just the indentation at the start of each line and leaves any tab characters inside the content — such as tab-separated data — untouched.
4. Copy or download the space-indented result and paste it back into your editor or file.

The preview updates live, so you can flip between 2 and 4 spaces and immediately see which reads better before you commit.

Choosing the right spaces-per-tab value

There is no universal answer — follow your language's convention:

When in doubt, match the existing file or your team's linter configuration so the change produces a clean diff instead of reformatting every line.

Why in-browser conversion keeps code private

Everything happens client-side in JavaScript. Your code is processed in the page and never uploaded to a server, which matters when the source is proprietary or under an NDA. Because there is no round-trip, conversion is also instant and keeps working offline once the page has loaded.

Try the Tabs to Spaces Converter — free and 100% in your browser.

FAQ

How many spaces should I use per tab?

Match your language's style guide: 4 spaces for Python, 2 for most web languages. If a project already uses a set width, mirror it so your change does not reformat unrelated lines.

What if my file has tabs inside the text, not just indentation?

Enable "Leading tabs only." That converts only the tabs at the start of each line, leaving in-content tabs — like columns in tab-separated values — intact.

Will converting tabs change my line breaks or blank lines?

No. Only tab characters are replaced. Line breaks, blank lines, and existing spaces are preserved exactly as they were.

Can I convert a whole file at once?

Yes. Paste the entire file's contents into the input; every tab is converted in one pass, and you can download the result as a file.

Related free tools

• Spaces to Tabs Converter — go the other direction and collapse spaces to tabs.
• Remove Extra Spaces — clean up doubled or trailing spaces.
• Find and Replace Text — targeted replacements across your text.
• Add Line Numbers to Text — number lines for reference or sharing.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio building web apps, SaaS, and custom software. If privacy-first developer tools like this fit how you work, explore what ByteVancer can build for your team.