How to change tab size on GitHub?

Set default displayed tab size for your repository

When you have a .editorconfig in your repository it will respect it when viewing code on GitHub.

indent_style = tab and indent_size = 4 shows tabs with 4 columns instead of 8 https://github.com/isaacs/github/issues/170#issuecomment-150489692

Example .editorconfig for multiple extensions which works in JetBrains' products:

root = true

[*]
end_of_line = lf
insert_final_newline = true

# Matches multiple files with brace expansion notation
[*.{js,jsx,html,sass}]
charset = utf-8
indent_style = tab
indent_size = 4
trim_trailing_whitespace = true

[*.md]
trim_trailing_whitespace = false

Change how you see tabs on other repositories

Install Stylus in your browser, than install GitHub: better-sized tabs in code.

There are also Google Chrome extensions:

• https://chrome.google.com/webstore/detail/github-tab-sizer/djpnapkcpjomnkfekaedkigfomiedpjf
• https://chrome.google.com/webstore/detail/github-tab-size/ofjbgncegkdemndciafljngjbdpfmbkn/related

You can append ?ts=2 or ?ts=4 to the URL to change the tab-size.

Example: https://github.com/jquery/jquery/blob/main/src/core.js?ts=2

It seems that the value can be anything from 1 to 12. It does not work on Gists or raw file views though.

Source: GitHub Cheat Sheet