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

To convert spaces to tabs online, paste your code into the Spaces to Tabs Converter, set how many spaces equal one tab, and each matching run of spaces is replaced by a single tab character. Enable "Leading spaces only" to touch just the indentation, then copy or download the result. It all runs in your browser, so your code is never uploaded.

This tutorial covers what the converter does, the exact steps to use it, and how to pick the right tab width for your codebase.

What the converter does

The tool scans your text for runs of spaces and swaps each run of N spaces for one tab, where N is the width you set. If you use four-space indentation, set N to 4 and every four-space block at the start of a line becomes a single tab. The result is tab-indented text that stays visually identical in an editor but takes fewer bytes and lets each developer choose their own display width.

You control two things: how many spaces make a tab, and whether to convert only leading whitespace or every qualifying run anywhere in the line.

Step-by-step conversion

1. Paste your text or code. Drop the space-indented source into the input box.
2. Set the tab width. Enter the number of spaces that currently make up one indent level — commonly 2 or 4.
3. Choose the scope. Enable "Leading spaces only" to convert just the indentation at the start of each line, or leave it off to convert every run of N spaces throughout.
4. Review the live preview. The tab-indented output updates as you adjust settings, so you can confirm it looks right.
5. Copy or download. Grab the result and paste it back into your editor, or download it as a file.

Leading spaces only vs. all runs

This one setting decides whether inner spacing survives. The table shows the difference on the same line.

For most source code, "Leading spaces only" is the safe choice. Converting every run can turn spaces inside string literals or aligned tables into tabs, which is rarely what you want.

Why conversion stays private

All processing happens locally in your browser with JavaScript, so your source never leaves your device and no server sees it. That makes the converter safe for proprietary or client code. Because there is no server round-trip, it also keeps working offline once loaded — useful on restricted networks.

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

FAQ

What tab width should I choose?

Match the indentation your file already uses. If each indent level is four spaces, set 4; if two, set 2. Getting this wrong leaves stray spaces behind or over-converts.

Does it change how the code looks in my editor?

Visually it stays the same as long as your editor's tab width matches. The bytes change, but the on-screen indentation is preserved.

Can I convert a whole file at once?

Yes. Paste the entire file's contents into the box, convert, and download the result. Everything is processed in one pass.

What happens to lines that use a different indent size?

Only exact runs of N spaces are converted. A line indented by a non-multiple of N keeps its leftover spaces, so mixed indentation is left visible rather than silently mangled.

Related free tools

• Tabs to Spaces Converter — reverse the conversion when a project needs spaces.
• Remove Extra Spaces — collapse redundant spacing before converting.
• Find and Replace Text — make broader whitespace edits.
• Add Line Numbers to Text — annotate code for review.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio building web apps, SaaS, and custom software. If you need developer tooling or a product built with the same attention to detail, explore ByteVancer.