If you have ever searched for MacBook hashtags, you are probably trying to do one of two things: type the # symbol on your MacBook keyboard, or use hashtags properly in social apps from a Mac. This guide covers both, with UK specific shortcuts, common keyboard layout problems, and practical tips for using hashtags on Instagram, X, LinkedIn, TikTok, and more.

What People Mean by “MacBook Hashtags”

The phrase often shows up when someone:

• Cannot find the hashtag key on a MacBook, especially on a UK keyboard.
• Has the wrong keyboard input source selected, so the keys type the wrong characters.
• Wants to add hashtags in a post but is unsure how they work on each platform.
• Is using a MacBook with an external keyboard and the layout does not match.

In the UK, the most common issue is that the hashtag is not on the same key as it is on some US layouts. Once you know the right shortcut and how to check your keyboard settings, it becomes straightforward.

MacBook hashtags: how to type the # symbol on a UK keyboard

On most UK MacBook keyboards, you can type the hashtag symbol like this:

• Option (Alt) + 3 to type #

If that does not work, do not assume your keyboard is broken. It is usually a layout setting issue. Jump to the troubleshooting section below to fix it quickly.

Where is the hashtag key on a MacBook?

MacBooks do not always have a dedicated key labelled with # in the same way many Windows keyboards do. On a UK Mac layout, # is commonly produced via Option (Alt) + 3. If you are looking for a physical key that shows #, you may not see it, or it may be printed differently depending on the model and year.

How to type # on MacBook Air vs MacBook Pro

The shortcut is the same on macOS regardless of whether you use a MacBook Air or MacBook Pro. What changes is the keyboard layout you have selected in macOS, and whether you are using a UK or US physical keyboard.

Common UK keyboard layouts and why # sometimes will not type

Most problems come down to a mismatch between:

• The physical keyboard you are using (UK, US, ISO, ANSI).
• The input source selected in macOS (British, U.S., ABC, and so on).

If macOS thinks you have a US keyboard, the keys will produce different symbols. That is why people often press a key expecting # and get something else.

Check and change your keyboard input source (UK steps)

To confirm you are using the right layout:

• Open System Settings.
• Go to Keyboard.
• Select Text Input (or Input Sources).
• Check the current input source. For most UK users, choose British.

After switching, test Option (Alt) + 3 again.

Enable the Input menu so you can switch quickly

If you regularly switch languages or layouts, enable the input menu in the menu bar. This makes it easy to spot when you are accidentally on the wrong layout.

How to type a hashtag on a MacBook in different apps

Typing # is only half the story. Some apps handle hashtags differently, especially when it comes to suggestions, clickable tags, and formatting.

Hashtags on Instagram from a MacBook

If you use Instagram in a browser on your MacBook, hashtags work much like they do on mobile:

• Type # followed by a word or phrase with no spaces, for example #LondonCoffee.
• Instagram may show suggestions as you type. Choose one if you want a standard tag.
• Use relevant, specific tags rather than broad ones. Broad tags are crowded and can bury your post quickly.

Tip: If you are writing a longer caption, draft it in Notes first, then paste it into Instagram. This reduces mistakes and makes it easier to edit.

Hashtags on X (Twitter) on macOS

Hashtags on X help people find posts around topics and events. On a MacBook:

• Type # and start the topic, for example #SixNations.
• Keep them short. Long hashtags are harder to read and easier to mistype.
• Use one or two strong tags rather than adding many.

Hashtags on LinkedIn from a MacBook

LinkedIn hashtags can help your post appear in topic feeds, but they work best when they match professional interests:

• Use 3 to 5 relevant hashtags, for example #DigitalMarketing, #SEO, #Ecommerce.
• Place them at the end of the post for readability.
• Avoid overly casual or spammy tags.

Hashtags on TikTok and YouTube (desktop)

On TikTok and YouTube, hashtags can help with discovery, but the platform also relies heavily on watch behaviour and topic relevance:

• Use tags that describe the content clearly.
• Avoid irrelevant trending hashtags. They can reduce trust and performance.
• Keep spelling consistent. A small typo creates a different tag.

How hashtags work: quick rules that stop you wasting time

Hashtags are simple, but small details matter. These rules apply across most platforms:

• No spaces: #UK Travel becomes two parts and will not work as intended.
• Letters and numbers are safest: punctuation can break the tag.
• Case does not change the tag, but it improves readability: #SmallBusiness is easier to read than #smallbusiness.
• Specific beats broad: #CoffeeShopManchester is often more useful than #Coffee.
• Do not overdo it: too many hashtags can look spammy and reduce engagement.

Step by step: type # on a MacBook and fix it if it is not working

If you cannot type a hashtag on your MacBook, work through these steps in order.

Step 1: Try the UK shortcut

• Press Option (Alt) + 3

Step 2: Confirm your keyboard layout is set to British

• System Settings
• Keyboard
• Text Input or Input Sources
• Select British

Step 3: Check for a second input source that is taking over

If you have multiple input sources installed, you may be switching accidentally. Remove ones you do not use, or keep the input menu visible so you can see what is active.

Step 4: Test in a simple app

Open Notes and test the shortcut there. If it works in Notes but not in a specific app, the issue is likely app specific, such as a custom shortcut or text replacement.

Step 5: Check for remapped keys or third party tools

If you use tools that remap keys, such as keyboard customisers, they can override macOS behaviour. Temporarily disable them and test again.

Step 6: External keyboard checks

If you use an external keyboard:

• Confirm whether it is a UK or US physical layout.
• Make sure macOS matches that layout.
• If the keyboard has both Alt and Option style keys, test both left and right Option keys.

Practical hashtag tips for better reach and cleaner posts

Once you can type # reliably, the next step is using hashtags in a way that supports your content rather than cluttering it.

Build a small set of repeatable hashtags

Create a shortlist of tags you use often, then tailor them per post. For example, a UK based freelancer might rotate:

• #SmallBusiness
• #UKBusiness
• #Freelancer
• #ContentMarketing
• #SEO

Keep them in Notes so you can paste and edit quickly on your MacBook.

Use location hashtags carefully

Location tags can help local discovery, but only if they match your audience. If you serve a specific area, use a mix of city and niche tags, for example #BristolFood, #BristolCafe, #BristolBrunch.

Check the spelling before you post

A hashtag with a typo becomes a different tag. On desktop, it is easy to miss small errors. A quick scan before posting saves you from losing visibility.

Do not hide irrelevant hashtags in comments

Some platforms allow hashtags in comments, but relevance still matters. If the tags do not match the content, you can attract the wrong audience or reduce engagement quality.

FAQ

How do I type a hashtag on a UK MacBook?

On most UK MacBook keyboards, press Option (Alt) + 3 to type #.

Why is my MacBook typing a different symbol instead of #?

Your keyboard input source is likely set to a different layout, such as U.S. Switch it to British in System Settings under Keyboard and Text Input.

Is the hashtag shortcut different on MacBook Air and MacBook Pro?

No. The shortcut depends on your keyboard layout settings, not the MacBook model.

Can I use hashtags on Instagram from a MacBook browser?

Yes. Type # followed by the tag in your caption. Instagram will often suggest tags as you type.

How many hashtags should I use per post?

It depends on the platform, but a small number of highly relevant hashtags usually performs better than a long list. Aim for clarity and relevance first.

Do hashtags work in all apps the same way?

No. Some platforms use hashtags heavily for discovery, while others rely more on user behaviour and content relevance. The typing is the same, but the impact varies.