How to ignore whitespace in github when comparing?

Question

I have committed a file after prettifying it in sublime. Now when I am comparing the differences in GitHub web UI it's showing a lot of changes, so it is very difficult to see the actual changes. Can I compare files in there and ignore the whitespace?

Answer 1

On github, you simply append the w=1 parameter to the URL for it to ignore whitespace.

That would look something like:

https://github.com/account_name/repo/pull/14/files?w=1 

Answer 2

Since May 2018, this option is now more visible:

A diff view with reduced white space has been available since 2011 by adding ?w=1 to the URL.
The new button builds on this view to better support your existing workflows.

Select the new option "Hide whitespace changes" in that "Diff settings" new button, and you will see only the relevant changes you want.

Note: since 2018, that setting has been relocated to the setting "gear" symbol:

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Since Oct. 2021, this option is now persistent!

Hiding whitespace is now remembered for each pull request

The diff setting to hide whitespace changes in the pull request Files Changed tab is now remembered for you for that pull request.

You no longer need to re-enable it when you switch to another tab or when you come back to the same pull request later.

Learn more about reviewing proposed changes in a pull request.