Can I change the language in online version to Spanish?

Good to see you here, @ventas-hgh-pharm.

I'll share a workaround on how to alter languages in QuickBooks Online.

Shifting the language settings in QuickBooks Online is currently available for international versions. We are constantly looking for ways to improve the features of our products.

We value our customers' feedback and use it to determine which areas we need to improve. I'm noting this idea and passing it along.

Optionally, you can change the one you're currently using in the browser's Language settings. 

Here are the steps for Google Chrome.

1. Tap the three-dot icon to select Settings.
2. Then, click the Advanced link below to access the Languages section.
3. From there, hit the drop-down for Language to access the Add Language window.
4. Mark the box for the one you want to use, and then press the Add button.

For other browsers, the following article contains some links on how to update the language settings: Microsoft Forms.

Additionally, I'd like to encourage you to view the latest news and product enhancements at the QuickBooks Resource Centre.

You're always welcome to post here anytime you need help with your preferences in QuickBooks Online. I'm happy to work with you. Have a great day!