The short version: Gemini's photo editing tool (built on the Nano Banana model, officially called Gemini 2.5 Flash Image) can turn any photo into a costume, poster, or spooky scene without touching Photoshop. Below are 30 prompts you can copy, paste, and adjust for your own face, pet, or product photo. The bit most guides skip is that a copy-pasted prompt gives you the exact same result everyone else gets, so I'll show you where to tweak them so your version doesn't look identical to the other three hundred people posting the same "vampire selfie" this October.
Why Gemini works well for Halloween edits
Google rolled Nano Banana into the Gemini app in 2025 and it does one thing well that older AI image tools struggled with: it keeps your actual face when it edits a photo, instead of generating a new person who vaguely resembles you. That matters enormously for Halloween content, because a costume photo where you look like someone else entirely is a wasted photo. You upload an image in the Gemini app, type or paste your prompt, and it edits the existing photo rather than starting from scratch.
If you've never written prompts for image editing before, it's worth reading how to write aesthetic photo prompts for AI image tools first, because the same rules apply here: be specific about what stays the same as much as what changes.
How to use these prompts (the actual steps)
- Open the Gemini app or Gemini web on desktop and start a new chat.
- Upload the photo you want to edit. A clear, well-lit photo with your face visible works far better than a dark or blurry one.
- Paste one of the 30 prompts below, then add your own detail (skin tone, hair colour, room description) so it isn't a generic result.
- Ask for two or three variations in the same chat before you settle on one. Gemini remembers the context, so you can say "try that again but darker lighting" without re-uploading anything.
- Download the final image at full resolution before you post it, since some platforms compress images shared straight from a chat window.
Google doesn't publish a fixed daily cap for free Gemini accounts, but expect image edits to get throttled faster than text chats do, especially in the last two weeks of October when everyone else is doing the same thing. If you're editing photos for a business account, batch them earlier in the month rather than the night before Halloween.
30 copy and paste Halloween photo edit prompts
Costume transformations
- Turn me into a Victorian vampire with pale skin, dark circles under my eyes, and a black velvet collar. Keep my facial features and hairstyle exactly the same.
- Dress me as a friendly witch with a pointed hat and a faint green glow around my hands. Keep the background as it is.
- Turn my outfit into a zombie costume with torn clothes and grey skin, but keep my face recognisable and not gory.
- Make me look like a classic 1930s mummy character wrapped in bandages, shot in black and white with studio lighting.
- Turn me into a werewolf mid-transformation, with subtle fur appearing on my arms and jaw. Keep my eyes and smile unchanged.
- Add a full skeleton face paint effect like Dia de los Muertos, keeping my hairstyle and clothing exactly as they are.
Backgrounds and settings
- Replace the background with a foggy graveyard at night under a full moon. Keep me in the foreground looking natural.
- Put me in front of a haunted Victorian mansion with broken windows and crows on the roof.
- Change the setting to a pumpkin patch at golden hour with dozens of carved jack o'lanterns.
- Add a spooky forest background with twisted bare trees and orange fog rolling across the ground.
- Place me inside an old abandoned fairground with a broken ferris wheel and dim string lights.
- Turn the room behind me into a witch's cottage with a bubbling cauldron and shelves of potion bottles.
Pets and family photos
- Turn my dog into a tiny friendly dragon with small wings. Keep its face and markings recognisable.
- Dress my cat as a black cat witch familiar with a small hat. Keep its natural fur pattern.
- Turn our family photo into a 1960s haunted house movie poster. Keep everyone's faces exactly the same.
- Add matching pumpkin costumes to everyone in this group photo without changing anyone's face.
- Make our family portrait look like an old sepia photograph from an abandoned asylum, with cracked edges and film grain.
Poster and film style
- Turn this photo into a 1980s slasher movie poster with dramatic lighting, leaving empty space at the top for a title.
- Make this look like a vintage horror comic book cover from the 1950s with halftone dots and bold flat colour.
- Give this photo a horror movie poster treatment with light coming from below and deep shadows across the face.
- Turn this into a black and white noir horror still from the 1940s, with heavy grain and hard shadows.
- Make this look like a claymation stop motion Halloween character in a gothic, whimsical style, without copying any specific existing character.
- Turn this into an illustrated Halloween storybook page with soft ink outlines and muted autumn colours.
Makeup and effects
- Add realistic special effects zombie makeup with torn skin on one cheek and exposed bone. Keep my eyes untouched.
- Give me glowing yellow cat eyes with subtle black eyeliner like a shapeshifter. Keep the rest of my face natural.
- Add a thin line of fake blood at the corner of my mouth, stylised rather than graphic.
- Turn my skin tone pale grey like a ghost with faint see-through edges around my silhouette.
- Add glowing orange veins across my face and neck like a possessed character. Keep my hair and clothing the same.
- Give me subtle old age prosthetic makeup like a two hundred year old witch, with wrinkles and grey hair, keeping my facial structure recognisable.
For business and product photos
- Turn this product photo into a spooky Halloween version with light cobwebs and an orange glow, keeping the product label fully readable.
A worked example
Say you run a small bakery and you want ten days of October Instagram content without paying a photographer. You take one clean photo of your counter and your best-selling cupcake. In Gemini, you run the product prompt above first: cobwebs, orange glow, label still readable. That's post one. Then you take a staff photo and run it through the "witch's cottage background" prompt for post two, the "vampire" costume prompt on yourself for post three, and the "pumpkin patch background" prompt on a photo of the shopfront for post four. In under twenty minutes you've got four distinct posts from two source photos, none of which required a camera crew, a costume budget, or a Sunday spent editing in Lightroom. That's the actual value here: not one clever photo, but a fast supply of usable ones.
The part most guides leave out
Copy-pasting a prompt word for word gets you the same output as the next person who pastes it. If your business posts a "vampire selfie" using the exact wording above and so does a competitor down the road, Gemini will land on a broadly similar look for both of you, because the prompt is doing most of the work and your face is doing the rest. The fix isn't complicated: add one specific, personal detail every time. Name the colour of your actual coat, describe your real kitchen instead of a generic one, mention the specific pumpkin you carved last weekend. A generic prompt plus one specific detail beats a "better" prompt copied exactly. This is the same principle I cover when I talk about writing prompts for any AI image tool, not just Gemini, in my piece on writing aesthetic photo prompts: specificity is the entire job, and a prompt list is only ever a starting point.
There's also a plain legal point worth saying out loud: if you're editing photos of customers, staff, or anyone who didn't ask you to, get their agreement before you post an AI-altered version of their face online. It costs you one text message and it avoids an argument later.
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Getting more from Gemini beyond Halloween
Once you've used these prompts a few times, the same editing skill carries over into everyday marketing photos, not just seasonal ones. If you want a wider set of prompts for moving images rather than stills, my guide to AI video prompts for 2026 covers the same copy and paste approach for short clips. And if Gemini's photo editing has got you curious about what else AI chat tools can do with images and daily limits, I've broken that down in ChatGPT prompts and limits, which covers photo edits on the ChatGPT side too.
Frequently asked questions
Is Gemini free to use for photo editing?
Yes, Gemini's free tier includes photo editing through the Nano Banana model, though Google doesn't publish an exact daily limit and heavier or repeated edits can get throttled faster during busy periods, so don't leave all your Halloween content to the last week of October.
Do these prompts work on any photo?
They work best on clear, well-lit photos where the face or main subject is fully visible. Dark, blurry, or heavily cropped photos give Gemini less to work with and the result tends to look less convincing.
Can I use these prompts for a business Instagram or TikTok account?
Yes, and the product prompt in this list was written with exactly that in mind. Just check your platform's rules on AI-edited or altered content, since some now ask you to label edited images, and always get consent before editing a photo of a customer's face.
Why does my result look different from someone else's using the same prompt?
Because Gemini is editing your specific uploaded photo, not generating a new image from nothing, so lighting, angle, and your actual face all shape the outcome. That's the useful part: two people can paste the identical prompt and still get two different, personal results.
