Hashtags vs Keywords

By Tagbloom Editorial Team (how we write) · Published 4 October 2026 · Updated 5 October 2026 · 8 min read

Hashtags vs keywords is one of the most confusing topics for new creators, because the two look similar and often overlap. A hashtag is a clickable label with a # in front of it. A keyword is any word or phrase that a person might type, say or read when they are looking for something.

Quick answer

A hashtag is a clickable label with a # in front. A keyword is any word or phrase people search for. They overlap, and you can choose both for the same post.

If your question is a little different, these guides cover it: Instagram Reels Hashtags vs Keywords: What to Put in Your Caption; Social Media SEO for Beginners: A Practical Plan.

Knowing the difference helps you decide where each one goes, how many you need and what to do when a platform changes its rules. This guide explains both in plain English, shows where they fit on Instagram, TikTok and YouTube, and walks through a made-up example so you can copy the method the same day.

Hashtags vs keywords: the core difference

The simplest way to remember it is this. A hashtag is a label you attach to a post. A keyword is a meaning that runs through the whole post.

A hashtag is a deliberate choice. You type the # symbol, then a word or phrase with no spaces, and the platform turns it into a link. People can tap that link to see other posts that use the same label. The hashtag is there on purpose, and anyone can see it.

A keyword is less visible. It can sit inside your caption, your title, your profile name, the alt text of an image, the words you speak in a video or the text you show on the screen. You do not need a special symbol. The platform may read those words to understand what your content is about, and a viewer who types the same words into a search bar may find you.

So a hashtag is one way of using a keyword, but a keyword does not need to be a hashtag. The phrase "easy weeknight pasta" can be a keyword in your caption, a spoken line in your video and a hashtag written as #easyweeknightpasta, all at once.

What a hashtag actually does

A hashtag groups content by topic. When you add one, you are telling the platform and the audience, "this post belongs with that subject". That is its main job.

As of this writing, Instagram has said that hashtags matter less for reach than they once did, and it has advised using a small number of targeted ones rather than a long list of generic ones. Instagram has also said it is limiting captions on posts and reels to 5 hashtags, with a gradual rollout, so what you see may differ from another account. Check the Instagram Help Center page on using hashtags for the current position.

Hashtags also help people browse. Someone who follows a topic or taps a tag on a post can discover more of the same. This is why a tag that is too broad, such as a single common word, rarely helps. Thousands of unrelated posts share it, so yours is easy to lose.

A good hashtag is specific enough to describe your post and common enough that people actually use it. A tag nobody else uses may still be fine if it is your own branded tag, but it will not help people find you by topic.

Clear, specific words help people and search find your post.

What a keyword actually does

A keyword helps a platform understand your content and helps a person find it through search. Think of it as the answer to the question, "what would someone type to find this?"

Platforms describe using several signals to understand posts. Instagram has said that captions, keywords, alt text and the words spoken or shown in a video can all help it understand what a post is about. TikTok has described using captions, on-screen text, sounds and spoken words in a similar way. We cannot say how much weight any of these carry, and nobody outside the platforms can promise a ranking. What we can say is that clear wording is a sensible habit.

Keywords work best when they are phrases people really use. "Beginner yoga for tight hips" is more useful than "yoga" because it matches a real need. Longer, more specific phrases are also easier to write about honestly, because you can describe what the post truly covers.

You can find keyword ideas without any paid tool. Type the start of a phrase into the platform's search bar and look at the suggestions that appear. Those suggestions can show what people type. Our guide to TikTok SEO keywords in captions shows how to turn them into caption wording.

Where each one belongs on each platform

Each platform treats the two a little differently, so here is a quick comparison. Limits and menus change, so confirm anything important in each platform's Help Center.

Platform	Hashtags	Keywords
Instagram	In the caption or a comment; up to 5 as of this writing	Caption, name field, bio, alt text, spoken and on-screen words
TikTok	In the caption; no official count limit we could verify, but they use up your caption characters	Caption, on-screen text, spoken words, sounds
YouTube	In the title or description; up to 3 are shown by the title	Title, description, spoken words, Tags field (limited role)

On YouTube the Tags field in YouTube Studio allows 500 characters in total. YouTube says tags play a minimal role in discovery, though they can help with commonly misspelled words. Your title, thumbnail and description matter more. Titles can be up to 100 characters and descriptions up to 5,000 characters, as widely documented.

For a closer look at one platform, read Instagram Reels hashtags vs keywords, which covers what to put in a Reels caption.

Tags describe a post. A few relevant ones work better than a long list.

How to choose both for the same post

You do not need two separate research projects. Start with one idea, then work outwards.

Write one sentence that describes the post as if you were telling a friend.
Underline the two or three phrases someone might search for.
Place those phrases naturally in your caption or title and, if it suits the format, say them out loud in the video.
Turn the strongest one or two into hashtags, and add one broader topic tag if it truly fits.
Read the caption once more. If it sounds stuffed, cut it back.

If you want a head start, the free tag generator can suggest phrases from a seed word and label them Broad, Niche or Long-tail. The label is an estimate based on how specific a phrase is. It does not know live search volume, and nothing you type is sent to a server.

Worked example: a hypothetical home-baking account

This is a made-up illustration, not a real case, and it makes no promise about results. Imagine a small account that posts short videos about baking sourdough at home.

The post: a video showing how to shape a loaf so it holds its form.
Plain sentence: "How to shape sourdough so it does not spread flat."
Keyword phrases: "shape sourdough loaf", "sourdough does not spread", "beginner sourdough".
Caption: "How to shape a sourdough loaf so it holds its height. Three simple steps for beginner sourdough bakers."
Spoken line: "Today I will show you how to shape a sourdough loaf."
Hashtags: #sourdoughshaping and #beginnersourdough, plus #homebaking as a broader topic tag.

Keywords go in the words people read and hear. Hashtags are a short, tidy label on top. Two or three accurate ones are enough to start.

The baker then checks the platform's analytics after a few posts and keeps the wording that matches what viewers respond to.

Start from one clear idea, then adapt it for each place.

Common mistakes to avoid

Most problems come from treating hashtags as magic words. Here are the ones that appear most often.

Using only broad tags. A single common word describes everything and therefore nothing.
Hiding keywords in a hashtag block. If the words only appear as tags, the caption itself says very little.
Copying the same list onto every post. Each post is about something specific, so the tags should change with it.
Using tags that do not match the post. This can feel misleading to viewers and may look spammy.
Ignoring the limits. Going over a platform's count can lead to tags being ignored. On YouTube, as of this writing, the Help Center says a video with more than 60 hashtags has all of them ignored, so confirm the current figure there. In practice 3 to 5 relevant ones is plenty.

Frequently asked questions

Are hashtags still worth using?

They can still help group your post with a topic and make it easier to browse. Platforms have said they matter less than they once did, so treat them as a small helper rather than the main plan. Clear captions, titles and spoken words do much of the work.

Can I use the same keywords as hashtags?

Yes, and it often makes sense. Take your best keyword phrase, remove the spaces and use it as a tag. Just keep it readable by capitalising each word, for example #BeginnerSourdough, which also helps screen readers.

How do I know which keywords people really use?

Start with the search suggestions on the platform you post to, since they can show what people type. Then compare your own analytics over several posts. Our tool cannot see live search volume, so use it for ideas, not for numbers.

Conclusion

Hashtags label a post. Keywords describe it in the words people actually use. You need both, but keywords carry more of the meaning, and a handful of well-chosen hashtags is enough.

Your next step is simple. Pick your next post, write one plain sentence about it, pull out two search phrases, and put them in your caption before you add any tags. If you want more on the numbers, read how many hashtags to use on Instagram and then check the platform's Help Center for the latest rules.

Official sources

Platform features and rules change. For the current wording, check the official help pages:

Tagbloom Editorial Team

We write each guide ourselves and check platform rules against the official Help Centers. Read how we research and update guides, or tell us about a mistake.

Hashtags vs Keywords: What Is the Difference on Social Media?