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Prompts that turn a photo or reel into a caption with the right tone and length. Each one sets the platform convention — a hook, a line break, a call to action — so the output reads like a real post, not a caption-shaped essay.
Write an Instagram caption for a product launch. Start with a punchy hook, explain what it is in one line, and end with a call to action. Keep it under 150 characters. Product: [paste].
Write a wanderlust Instagram caption for a travel photo. One evocative line, then a short question to drive comments. No hashtags in the hook. Place: [paste].
Write three scroll-stopping hook lines for the first second of an Instagram Reel about [topic]. Each under 8 words, punchy, curiosity-driven.
Write an Instagram giveaway caption. State the prize, the rules in two bullet points, and the deadline. Keep it excited but clear. Prize: [paste].
Write a casual behind-the-scenes Instagram caption about [process]. Warm, a little self-deprecating, one line that invites a question.
Write an Instagram caption for a carousel post about [topic]. Tease the slides, state the main takeaway, and end with a save-or-share nudge. Under 120 characters.
Write an Instagram caption featuring a customer's result with your product. Congratulate them, quote them if possible, and invite others to share. Three lines. Context: [paste].
Write a short Instagram Story text prompt that teases a new post going live. Curiosity-driven, under 10 words.
The prompts above are ready to copy and run. If none fits exactly, use the generator below to tune the tone, recipient, language, length, and format, then save it to your library for next time.
Paste it here and the prompt comes out complete — nothing left to edit. Saved in this browser only.
Your prompt
Write a friendly reply to this message to a friend. Keep it natural and concise. Keep it to two or three short sentences. Format it as a chat message — no subject line, no sign-off. Do not use any emojis. The message you received: [Paste the message you need to reply to]
Copy for Synapse
Copy this prompt, open Synapse custom prompts, tap Add, paste it as the instruction, and save. You can then select text in WhatsApp, Gmail, or any Android app and run it with one tap.
Your library stays on this device. Export it if you want a backup or want to move it to another browser.
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Save this as a custom prompt in the Synapse keyboard and trigger it with one tap inside WhatsApp, Gmail, or any Android app.
Instagram captions have a shape: a hook in the first line (because the feed truncates after about a line and a half), a line break, then the substance, then a call to action. A caption that reads as a paragraph of prose gets cut off before the point. The prompts above ask for that shape on purpose — a hook first, the rest after.
Length is a lever, not a virtue. Captions under 150 characters suit product posts and Reels; longer captions work for carousels and educational posts where people expect to read. The prompts here set the length per format so you are not guessing.
Put the call to action before the hashtags, not after — once the hashtag block starts, most readers stop. A specific CTA ('save this for your next launch', 'tell us your version below') outperforms a generic 'comment below'. The prompts ask for that specificity.
To keep captions on-brand across posts, save your tuned prompt in the My Prompts library and reuse it per post, or add it as a custom prompt in the Synapse keyboard and generate a caption draft straight from the Instagram caption field.
Copying prompts from a browser tab works, but it breaks your flow. The Synapse AI keyboard saves any prompt as a custom shortcut and runs it on selected text inside WhatsApp, Gmail, Upwork, or any Android app — one tap, no copy-pasting back to a website.
Download Synapse FreeShort for Reels and product posts (under 150 characters), longer for carousels and educational posts. The hook — the first line people see before 'more' — matters more than the total length, which is why every prompt here asks for a punchy opener first.
They leave hashtags out of the hook on purpose, because hashtags buried in the first line hurt reach. Add 5 to 15 relevant hashtags at the end yourself, or ask the model for a hashtag list as a separate step after the caption is written.
Yes. Every prompt is plain text with no app-specific syntax, so it pastes into any chat assistant. They are written to give the model a clear tone, goal, and format, which is what makes a prompt reliable across models rather than something tuned to one.
On this page, yes — the generator's My Prompts library saves any prompt to your browser so you can copy it again without rebuilding it. To reuse a prompt inside WhatsApp or Gmail itself, add it as a custom prompt in the Synapse keyboard and trigger it with one tap on selected text.
Yes — free, no sign-up, no account, and no AI call happens on this page. The prompts are static text; you copy them and run them in whichever assistant you already use.