TikTok SEO: how keywords in captions, text, and audio affect discovery

Half your future customers are not starting their trip research on Google. An Adobe study found that 49 percent of consumers have used TikTok as a search engine, up from 41 percent the year before. Someone searching “best whitewater rafting near Asheville” might be typing that into TikTok, not a browser.

TikTok search works more like traditional SEO than most people expect. The platform reads your captions, scans the text you put on screen, and transcribes every word you say out loud. It matches all of that against what people are searching for. If your video mentions the right terms in the right places, it shows up. If not, it gets buried under videos that do.

Here is how each of those three signals works and what you can do with them this week.

How tiktok decides what your video is about

TikTok’s search algorithm pulls from multiple signals to figure out what a video covers and who should see it. The three it weighs most are your caption, any text that appears on screen during the video, and the words spoken in the audio track.

A few years ago, TikTok worked differently. The old playbook was hashtag-heavy: stuff your caption with trending tags and hope for the best. That stopped working. TikTok and Instagram both shifted toward ranking content based on keyword context rather than hashtag clusters. The platform now treats your caption more like a search engine treats a page title. It treats your spoken words and on-screen text like body content.

If you are a fishing guide in Montana or a zip line operator in West Virginia, you already know the exact phrases your customers use when they are looking for what you sell. The work is just putting those phrases in the right places.

Captions are your most important keyword signal

Your caption is the most heavily weighted text signal in TikTok search. What you write there determines whether your video surfaces when someone searches a relevant phrase.

The difference between a weak caption and a strong one comes down to specificity. “Amazing day on the river” tells TikTok nothing useful. “Half-day whitewater rafting trip on the Nantahala River, Class II and III rapids, perfect for beginners” tells TikTok what the video covers, where it is, and who it is for.

An analysis by EmbedSocial found that including relevant keywords in captions increased reach by 20 to 40 percent. That is not a rounding error. On a video that would normally get 5,000 views, that is an extra 1,000 to 2,000 people seeing your content.

Write your captions the way your customers search. If you run a kayak rental business and people Google “kayak rental Lake Tahoe family friendly,” that exact phrasing belongs in your TikTok caption. You can find these phrases the same way you find them for your website, by checking what terms people already search before they book with you. If you have done keyword research for your website, you already have the list.

On-screen text gets scanned and indexed

TikTok uses optical character recognition to read every piece of text that appears in your video. Title cards, bullet points, location labels, anything visible on screen gets fed into the algorithm as another signal about your content.

Most people underestimate how much this matters. One industry analysis found that videos with keyword-rich on-screen text ranked significantly higher in TikTok search results than videos without it, with some reports citing a fourfold increase in search visibility.

The most useful on-screen text is a title overlay in the first two to three seconds. When someone scrolls past your video in search results, that title is what they see in the preview. It tells TikTok what the video covers and tells the viewer whether it is worth watching.

AVA Rafting, a Colorado-based outfitter, started adding text overlays like “Brown’s Canyon rafting, what to expect on your first trip” to the opening frames of their TikTok videos. The text matched what people were actually searching, and the videos started showing up in results for those terms. Same principle as writing page titles for your website. The words need to match what someone would type.

You do not need fancy editing software for this. TikTok’s built-in text tool is enough. Add your primary keyword phrase as a title at the start, and consider adding a location tag or activity type as a secondary text element later in the video. Keep it readable and relevant. Decorative text that says “vibes” or “let’s go” does nothing for search.

Spoken words feed the algorithm through transcription

TikTok runs automatic speech recognition on every video’s audio track. It transcribes what you say and uses those words as another ranking input. The words coming out of your mouth get indexed as searchable text.

Your voiceover is an SEO tool, whether you think of it that way or not. If you are shooting a video about fly fishing on the Madison River, say “fly fishing on the Madison River” out loud in the first few seconds. TikTok’s ASR processes the entire audio track, but the opening lines carry more weight for how it classifies the video.

Wild Barn Coffee, a small brand in Wyoming, figured this out and started scripting their opening lines. Instead of starting videos with “hey guys, check this out,” they opened with “here is what a morning looks like at our coffee shop in downtown Jackson.” Location and business type, right up front. Their search impressions climbed.

None of this means reading a keyword list into the camera. Just be deliberate about mentioning your location and activity type when you narrate. If your trip guide pages already target phrases like “guided horseback riding in Sedona,” use those same phrases in your video narration.

How to layer all three signals without sounding robotic

The best results come from using all three channels at once: caption, on-screen text, and audio. When your primary keyword appears across all three, TikTok has triple confirmation of what your video covers.

Here is what that looks like in practice for a guided fishing operation:

• Caption: “Fall brown trout fishing on the White River, Arkansas. Guided wade trips, what to bring and what to expect.”
• On-screen text (first 3 seconds): “White River fall trout fishing guide”
• Spoken opening line: “If you are planning a fall trout fishing trip on the White River, here is what you need to know.”

The phrase “White River fall trout fishing” appears in all three places, but each version reads naturally in its context. You are not repeating yourself. You are giving the algorithm three separate confirmations of the same topic.

Do not try to stuff secondary keywords into every signal. Pick one or two primary phrases and spread them across the three channels. Your caption has room for a few extra secondary terms. Your on-screen text should stay short. Your spoken audio should sound like you are talking to a customer, not reading search terms off a list.

What this means for your content calendar

If you are already creating video content for your website, you are most of the way there. The same clips you embed on trip pages or share on YouTube can be repurposed for TikTok with minor adjustments. Add a keyword-rich caption, drop in a text overlay during the first few seconds, and make sure someone says the key phrase out loud at the beginning.

The bigger shift is in how you plan new content. Instead of filming whatever looks fun and writing captions after the fact, start with the search term. Open TikTok’s search bar, type in your activity and location, and look at what autocomplete suggests. Those suggestions come from real search behavior on the platform.

Then build your video around one of those phrases. Script your opening line to include it. Set up your title card with it. Write your caption around it. This is the same content planning process you would use for a blog post, just applied to a 30-second video instead.

One thing that makes this worth the effort: shelf life. Unlike the For You page, where content cycles through in hours, search results on TikTok persist for weeks or months. A well-optimized video about “kayaking in the Apostle Islands” can keep pulling in views long after you post it, the same way an evergreen blog post keeps ranking on Google.

Start with what you already know

You do not need a TikTok strategy consultant for this. You need the keyword awareness you already have from your website and the willingness to say those words out loud on camera, put them on screen, and write them in your caption.

Pick one trip or activity you want to promote. Find two or three phrases your customers search when looking for that experience. Film a short video, 30 to 60 seconds. Add a text overlay with the primary phrase in the first three seconds. Say the phrase in your opening line. Write a caption using the phrase plus a sentence or two of context.

Post it. Watch your analytics over the next few weeks. The first video might not move the needle much. But the tenth one, each targeting a different long-tail phrase around your business, starts to add up.