A slideshow lives or dies on its text. There's no motion, no voiceover, no music cue to carry attention from one slide to the next — just an image and whatever words you put on top of it. Get the text wrong and even a great image gets swiped past in under a second. Get it right and the same image holds someone through five or six slides.
This is a breakdown of what actually works: how much text to use, how to size it, where to place it, and how to write lines that earn the next swipe.
Why Text Overlay Carries More Weight Than the Image
On video, the visual and the audio do a lot of the work — someone can absorb a hook while barely reading anything. On a slideshow, the text overlay *is* the hook. There's no other channel competing for attention.
This means two things matter more than they would on video: - Readability — if someone has to squint or pause to read a slide, they've already lost interest in swiping to the next one - Line-by-line pacing — each slide's text needs to create enough curiosity or value to justify the next swipe, on its own, without motion to carry momentum
Treat the text overlay as the actual content, not a caption on top of content.
How Much Text Per Slide
The single biggest mistake is cramming too much onto one slide. A slide isn't a paragraph — it's a beat.
Rule of thumb: one idea per slide, under 15 words where possible. If a slide needs two sentences, it usually means the idea should be split across two slides instead. Splitting also gives you more slides, which (within reason) increases completion-rate opportunities.
Exceptions exist — a "before" slide showing full context, or a final CTA slide that needs a bit more room — but the default should be short.
Font Size and Weight
Text needs to be legible at thumbnail size and full-screen size, on both a 6-inch phone and a smaller older device. As a baseline:
- Bold or heavy weight fonts perform best. Thin fonts wash out against busy background images. TikTok's native caption style uses a heavy weight for exactly this reason. - Large enough to read without zooming. If you have to squint at your own preview, it's too small. - High contrast against the background. A stroke or outline (TikTok's signature style — a black or white outline around the text) keeps it readable regardless of what's behind it. Solid-color background boxes are a fallback when contrast is unpredictable, but they cover more of the image.
Where to Place Text on the Slide
Placement affects both readability and how much of the image stays visible.
- Middle-third placement works for most content — it's the natural eye landing zone and avoids TikTok's UI overlays (the caption/username block at the bottom, the engagement icons on the right side). - Bottom placement works when the image itself is the point (product shots, before/afters) and text is secondary framing. - Avoid the bottom-right corner and the very bottom strip — that's where TikTok's own UI sits, and text there gets obscured.
Test both middle and bottom placement across a batch of posts and watch swipe-through behavior — it varies by niche more than people expect.
Writing the First Slide (The Hook)
The first slide's text overlay is the only thing standing between a swipe-past and a swipe-through. It needs to create a gap the viewer wants closed.
Formats that consistently work: - Numbered list hook — "5 things nobody tells you about X" - Direct question — "Why does X happen and nobody talks about it?" - Contrarian claim — "You're doing X wrong (here's why)" - Specific result — "How I went from X to Y in Z days"
Vague hooks ("check this out," "you need to see this") consistently underperform because they don't create a specific enough gap to close.
Writing the Body Slides
Each slide after the hook needs to do two things: deliver on the promise of the previous slide, and create enough forward pull to earn the next swipe.
- Lead with the payoff, not the setup. Don't build up to information — state it, then explain if needed. - Use numbers and specifics. "Add 2 tbsp" reads faster and feels more credible than "add a bit." - Keep a consistent visual rhythm. If slide 2 is a short punchy line, slide 3 shouldn't suddenly be three sentences. Consistency in pacing keeps the swipe rhythm going.
Writing the Last Slide
The final slide is where saves, shares, and follows get earned — and it's the slide most creators phone in.
Effective closing slides do one of: - Summarize in one line — gives people a reason to save the post for later reference - Ask a question — drives comments, which is a strong signal - Direct call to action — "Follow for more [category] tips" works better than a generic "follow me"
A slideshow that ends on a flat or empty note leaves engagement on the table even if the middle slides were strong.
Common Text Overlay Mistakes
Inconsistent font across slides. Switching fonts mid-slideshow looks unpolished and breaks the visual rhythm that keeps someone swiping.
Text that competes with a busy background. If the image has a lot of visual noise where the text sits, either reposition the text, add a stroke/shadow, or pick a different image for that slide.
Repeating the caption in the first slide. The on-slide text and the below-post caption serve different jobs — the slide text needs to work with zero context, since most viewers never read the caption at all.
No visual hierarchy. If every word on a slide is the same size and weight, nothing stands out. Bolding a key phrase or number helps guide the eye to what matters.
How This Works in Slyde
Slyde's text overlay engine generates hook text and body copy automatically per slide, using TikTok's actual in-app caption font and stroke style by default, with control over size, width, and vertical position from the Create page — plus the ability to override any AI-generated line manually before a slideshow posts.
For accounts running AI Automation, the same text-generation logic applies weekly, and pulls in performance data from past posts so hook phrasing and pacing keep adjusting toward what's actually converting swipes on that specific account.
One Practical Takeaway
Text overlay isn't decoration on top of a slideshow — it's the primary content. Short, high-contrast, purposefully sequenced text that opens a gap on slide one and closes it by the last slide will consistently outperform longer, denser text even on a weaker image. Treat every slide's text as a standalone beat that has to earn the next swipe on its own.
Start a 14-day trial at slyde.run to generate and auto-post slideshows with TikTok-style text overlay built in.