Physics effects
Melt, Inflate, Deflate, Explode, Crush, Squish, Dissolve, Crumble, Peel, Tear, Levitate, Poke, Cake-ify
A good Pika prompt reads like a shot list: look, subject, action, camera, sound, and what to leave out. This guide shows how to write prompts for Pika's current tools, including Pika H3 Flex, Pika 2.5, Pikaswaps, Pikadditions and Pikaffects, with copy-ready examples for cinematic shots, ads, animation and social clips.
Each Pika tool reads the prompt differently. Match your writing to the tool you're using.
| Tool | What the prompt does | Write it like |
|---|---|---|
| Pika H3 Flex | Describes scenes, motion, dialogue, ambience and music; can tag @Image, @Video and @Audio references | A timed shot list with separate Sound and Music lines |
| Pika 2.5 | Describes the full shot; an optional negative prompt lists what to avoid | A detailed visual description plus exclusions |
| Pikaswaps | Describes the replacement and what must stay the same; the region is a text description or a mask | "Replace X with Y, keeping A and B exactly the same" |
| Pikadditions | Adds a new element into an existing video | What to add, where, and how it moves |
| Pikaffects | You choose a named effect (Melt, Inflate, Explode, Squish…) rather than writing a prompt | No prompt needed. Pick the effect and upload an image. |
From Pika's API specs for Pika 2.5, Pikaswaps and Pikaffects, and the H3 Flex model card.
Style, lens, film look and colour palette: "cinematic, 35mm, warm golden hour".
Who or what, where, and the lighting. Be specific about clothing, materials and props.
One clear action per shot. On H3 Flex you can time it: "0–3s… 3–6s…".
One move with a speed word: "slow dolly in", "steady handheld follow".
Separate "Sound:" and "Music:" lines, with dialogue in quotes.
"No text, no logos, no subtitles", or use the negative prompt field.
Paste into Pika, then change the subject and details. The ones with Sound lines are written for H3 Flex; on Pika 2.5, drop the Sound and Music lines.
The Pikaswaps pattern follows Pika's own API example, which asks to replace a train-window view while keeping the passenger and cabin unchanged. More: Pikaswaps guide, Pikadditions guide and H3 Flex prompts.
Slow dolly in · dolly out · tracking shot · orbit · crane up · aerial drone shot · handheld follow · whip pan · static tripod · rack focus · close-up · wide shot
Cinematic · photoreal · anime · claymation · stop-motion · 3D animated · watercolour · pixel art · vintage VHS · documentary · noir · surreal
Golden hour · blue hour · neon · soft window light · hard rim light · candlelit · overcast · studio softbox · volumetric haze
Real-time speed · no slow motion · gentle · snappy · smooth continuous movement · one continuous shot, no cuts
Pika 2.5 and Pikaswaps have a separate negative prompt field for "text describing what to avoid in the video". With H3 Flex, put exclusions at the end of the main prompt instead.
Pikaffects work from an image plus an effect name, so there's nothing to write. Some effects have an editable recipe prompt you can override. Current effects include:
Melt, Inflate, Deflate, Explode, Crush, Squish, Dissolve, Crumble, Peel, Tear, Levitate, Poke, Cake-ify
Baby Me, 90s Me, Action Me, Hero Me, Museum Me, Warrior Me, Zen Me, Princess Me, Royal Me
Balloonify it, Hearts Bouquet, Love Bomb, Cupid Strike, Proposal, Ta-da, Magic Polaroid, Everythings Bonsai
Effect names from Pika's Pikaffects API spec, which lists over 60. More: Pika effects.
Clips from Pika's H3 Flex showcase. Study the look, motion and sound each one combines.
Videos © Pika, from the Pika H3 Flex research post.
| Problem | Try this |
|---|---|
| Result ignores half the prompt | Cut it down to one subject, one action and one camera move |
| Random text or watermark-like marks | End with "No text, no logos, no watermarks", or use the negative prompt |
| Everything in slow motion | Add "Normal real-time speed, no slow motion." |
| Camera does too much | One move per shot, plus a speed word (slow, steady) |
| Character changes between clips | Use the same image reference and repeat the same description |
| Unwanted music or subtitles (H3 Flex) | Add "No music." and "No subtitles." |
| Short prompt gets "improved" away | On H3 Flex, turn the prompt rewriter off for detailed prompts |
| Swap changes the wrong area | Describe the region clearly or use a mask, and list what to keep |
| Physics looks wrong | Simplify the action. Pika lists physics as an area still improving. |
More help: H3 Flex troubleshooting.
Pick H3 Flex for sound and dialogue, or Pika 2.5 for visual-only clips.
Copy a prompt, then swap in your subject, setting and style.
9:16 for Reels, TikTok and Shorts; 16:9 for YouTube. Start with 5 seconds.
Use a lower resolution first. H3 Flex costs 10 credits per 5 s at 768p.
Adjust the camera, look or action, regenerate, then finish your best take at a higher resolution.