How to Use Hashtags on Social Media

A hashtag is a word or phrase with a # in front. Clicking or searching it shows other posts that use the same tag. That makes hashtags useful as labels: they group posts by topic so people interested in that topic can find them. This guide covers the basics for anyone starting out.

What a hashtag is and what it does

Platforms turn a hashtag into a link that leads to a page of posts with the same tag. Hashtags are one signal among many. Captions, images, audio, location and the account itself also tell the platform what a post is about. So think of a hashtag as a clear label, not a switch that makes a post spread.

How to write one correctly

Use letters and numbers only. Do not include spaces, hyphens or punctuation, because they break the tag. For several words, join them together, as in #streetphotography. Capitalising each word in your own notes (#StreetPhotography) is optional but makes the tag easier to read, and it is better for people who use screen readers.

Where to put hashtags

On Instagram, put tags in the caption. On YouTube, put them in the description, and the first three show above the title. On TikTok, they go in the caption. On LinkedIn, place them at the end of the post. If a platform limits how many you can use, put the most accurate ones first.

Choosing tags that fit

Choose tags that describe what is actually in the post. A recipe video can use the dish name, the cuisine and a diet label. Avoid tags that are popular but unrelated, because they confuse the platform and mislead viewers. When you are not sure, search the tag and see whether the posts shown look like yours.

Common mistakes

Copying the same block on every post, using banned or misleading tags, adding tags that are not about the post, going over a platform's limit, and treating hashtags as a guarantee of reach. Another mistake is adding spammy tags such as 'follow for follow'. Stick to honest labels and the rest follows.

A simple publishing check

Before you post, read the final hashtag line as if you were a stranger seeing it without the caption. Can you tell what the content is about? Are the location and format labels true? Does any tag imply a claim, community or event that is not actually present? If the answer is unclear, trim it. This small check is more useful than searching for a magic number. It also helps when a post is repurposed across platforms, because a tag set that feels natural on one network may be too long or too broad on another.