How do I edit several Google ads at once (headlines, descriptions, link)?

In Google Ads:

1. Turn on Bulk edits and go to the Ads tab.
2. Select the ads you want to change and click Edit Ads in the bottom bar.
3. Only the headlines and descriptions that the selected ads have in common appear: whatever you edit replaces them in all of the selected ads.
4. You can also change the final URL of all of them at once.

Text that isn't shared by all the ads stays untouched in each ad. You never lose a variation that exists in only one ad.