Best AI Prompt Generators in 2026 for Image, Video and Chat

The best AI prompt generator is the one that writes for the kind of model you'll paste into. An image model wants the subject, light, framing and style spelled out; a video model also needs the action and the camera movement; ChatGPT or Claude works best with a role, a task and an answer format. So for a quick prompt from a rough idea, pick a generator that asks whether you're making an image, a video or a chat request. If you already have a picture you like, an image-to-prompt tool is faster, and if you're writing prompts for an app's API, OpenAI's and Anthropic's developer consoles are built for that job.

For most people, we'd start with Zemith's free AI Prompt Generator. We built it, so take that with the usual grain of salt, but it does the thing above: you type an idea in a few words, choose Image, Video, Chat or Photo edit, and get one detailed prompt plus three variations. You can try it without an account, and a free account gets a few prompts every day. When a prompt looks right, one tap opens it in Zemith's Creative Studio, its image editor or a new chat. Generating the image or video itself is on Zemith's paid plans: Plus is $15.99 a month and includes Veo and Kling video.

TL;DR

• Zemith's AI Prompt Generator is free to try without an account and writes image, video, chat and photo edit prompts, with optional hints for Midjourney, Nano Banana, GPT Image, Flux, Veo, Kling, Wan, ChatGPT, Claude and Gemini (October 2026).
• Jotform's AI Prompt Generator is free, Jotform says there's no limit, and it covers text and image models, but it doesn't list any video models.
• Midjourney's Describe turns an uploaded image into four prompts, but only inside Midjourney, whose plans start at $10 a month with no free trial (third-party pricing, 2026).
• PromptHero is a searchable library of prompts and results for Midjourney, Flux, Nano Banana, Veo, Kling and more, useful for ideas rather than for writing your own prompt.
• PromptPerfect, still on many "best prompt generator" lists, was due to shut down on September 1, 2026, according to third-party reports. Its site now shows only its title.

Best AI prompt generators compared: which should you use?

Prices and features as of October 8, 2026, in US dollars:

Sources: Jotform AI Prompt Generator, PromptHero pricing, Claude pricing and OpenAI's Playground help article, checked October 8, 2026. ChatGPT Plus from Suprmind's ChatGPT Plus price tracker, because chatgpt.com/pricing returned 403 to our requests. Midjourney's Describe behavior from Midjourney's docs as shown in search results (the page returned 403), and its plan prices from third-party 2026 pricing guides such as Krea's.

What makes a prompt generator good?

A good one asks what you're making and then fills in what you'd forget. A one-line idea like "a cabin in the snow" leaves the model to guess the time of day, the camera angle, the style and the mood, and it usually guesses something generic. The useful generators add those details, keep what you asked for, and give you a few different takes so you can compare.

This is what each kind of prompt should cover. It's the checklist we wrote Zemith's generator around, and you can use it by hand with any model:

• Image prompts: the subject and what it's doing, the setting, the style or medium, lighting, composition and framing, color palette and mood. Add lens and depth-of-field details only for photographic styles, never for anime, watercolor or 3D. One or two detailed paragraphs is plenty.
• Video prompts: one continuous shot of about 5 to 10 seconds, with the action, the shot type (wide, medium, close-up), the camera move (static, slow dolly in, pan, tracking, aerial), pacing, light, and sound if it matters. Keep the motion small enough to fit the clip.
• Chat prompts: a role, the task, the context with [placeholders] for details only you know, constraints (tone, length, audience) and the exact output format.

Is Zemith's AI prompt generator free?

Yes. You can try it without signing up, and a free Zemith account gets a few prompts every day, which refill daily. Paid plans give you many more.

Here's what it does, as of October 2026:

1. Pick a target: Image, Video, Chat or Photo edit. Each one writes the prompt the way that kind of model reads it, using the checklist above. Photo edit is for changing a photo of your own: describe the change, and the prompt tells ChatGPT or Gemini to use your uploaded photo and keep your face, your features and everyone in the picture the same.
2. Describe your idea in a few words, or tap an example.
3. Add options if you want. For images, video and photo edits, choose a style (Photo, Cinematic, Anime, 3D, Watercolor, Illustration, Pixel art or Minimal) and an aspect ratio (1:1, 16:9, 9:16, 4:3 or 3:4). Under "Written for", pick the model you'll use: Midjourney, Nano Banana, GPT Image or Flux for images; Veo, Kling or Wan for video; ChatGPT, Claude or Gemini for chat; ChatGPT or Gemini for photo edits. Pick Midjourney with an aspect ratio and the prompt ends with the matching --ar parameter.
4. Generate. You get the main prompt and three variations, any of which you can make the main prompt with one tap.
5. Use it. Copy it, or tap Generate this image, Generate this video, Edit your photo or Use it in chat to open Zemith's Creative Studio, its image editor or a new chat with the prompt already filled in. Generating images or video, or editing a photo, in Zemith is on the paid plans (Plus is $15.99 a month and includes video), and your prompt is kept while you sign up.

Prompts come back in the language you type in, so an idea written in Spanish gets a Spanish prompt. The exception is Midjourney and Flux: those come back in English, because those models follow English best.

Can ChatGPT or Claude just write the prompt for you?

They can, and for chat prompts they're a fine choice, especially if you want to go back and forth. The catch is that you have to know what to ask for. "Write me a Midjourney prompt for a cabin" gets you something usable, but rarely the lighting, framing and camera details you'd get from a tool that's built to ask.

If you'd rather stay in ChatGPT or Claude, paste this once and fill in the brackets:

You are an expert prompt writer for [image / video / chat] AI models.
Turn my idea into one ready-to-paste prompt for [model name].
Idea: [your idea in a few words]
For an image, cover subject, setting, style, lighting, composition, color palette and mood, in one or two paragraphs of plain prose.
For a video, describe one 5 to 10 second shot with the action, shot type, camera movement, pacing and lighting.
For a chat request, use labeled parts: Role, Task, Context with [placeholders], Constraints, Output format.
Then give 3 meaningfully different variations.

Both have free plans. You'd pay only if you hit their free limits: ChatGPT Plus is $20 a month, and Claude Pro is $20 a month or $17 a month billed yearly.

What's the best video prompt generator for Veo and Kling?

Most dedicated prompt generators we looked at stop at text and images. Jotform's, for example, lists text and image models only. That's a real gap, because video prompts fail differently: too much happens in one clip, or the camera move isn't stated, and the model fills the gap with jittery motion.

Zemith's generator has a Video target with Veo, Kling and Wan as model hints. It writes one continuous shot, states the shot type and camera movement, and keeps the action small enough for the clip. The prompts are plain natural language, so they also work in other video tools; there's no model-specific syntax to strip out.

If you then want to render it, Generate this video opens Creative Studio with the prompt filled in and models such as Veo, Kling and Wan. Video generation is on Zemith Plus ($15.99 a month) and up. The AI video generator page lists the models.

When should you use Midjourney Describe or an image-to-prompt tool instead?

When you already have the picture. Writing a prompt from scratch to match an existing image is slow; reverse tools do it from the image itself.

• Midjourney Describe gives four prompt suggestions for an uploaded image, on the web or in Discord, and you can run any of them straight away. It's the obvious pick if you already pay for Midjourney. Midjourney has no free trial, and plans start at $10 a month per third-party 2026 pricing guides.
• Zemith's Image to Prompt works outside any one image model: upload a photo, artwork or design and it writes a detailed prompt you can edit and reuse in Midjourney, Flux, Nano Banana or anything else. It's free to try.
• Zemith's Video to Prompt does the same for video: upload a clip or paste a YouTube link and get a text-to-video prompt for each scene (a shot list if the video has cuts), free with a Zemith account for clips up to 30 seconds and up to 3 minutes on paid plans.

If you're choosing between image models for the result, our Midjourney vs Nano Banana comparison for product photos covers that side.

Are prompt libraries like PromptHero worth it?

For ideas, yes. PromptHero says you can search millions of prompts for models such as Midjourney, Flux, Nano Banana, Stable Diffusion, Veo and Kling, and seeing a prompt next to its result teaches you a lot about what words do. It's less useful when you know what you want and need a prompt for your own idea. PromptHero's paid plans are mainly for generating images on its site: Starter is $16 a month and Pro $24 a month, both billed yearly.

Honest limits: when to pick something else

• You write prompts for an app's API. Use OpenAI's Playground, whose Generate button drafts a prompt from a task description, or Anthropic's Console, which introduced a prompt generator in 2024. They write system prompt templates with variables; Zemith's generator writes prompts for people to paste.
• You want unlimited free text prompts. Jotform says its generator is free with no limit. Zemith's free allowance is a few prompts a day.
• You want a saved prompt library. When you're signed in, Zemith's generator keeps your recent prompts for 60 days, but it isn't a library you can organize. PromptHero or a notes app is better for collecting them.
• You need Stable Diffusion weight syntax or Midjourney parameters beyond --ar. Zemith writes clean prompts without weights or extra flags; add them yourself.

How we compared

We read each tool's own page on October 8, 2026: Jotform's generator page, PromptHero's homepage and pricing, Claude's pricing page and OpenAI's Playground help article. Midjourney's docs, chatgpt.com and OpenAI's help center returned 403 to our requests, so those facts come from search results and the third-party sources named under the table. Zemith's behavior comes from the tool's own code and interface text, re-checked on October 10, 2026. We didn't run blind quality tests between generators; try two of them on the same idea and keep the one whose prompts you edit least.

The bottom line

If you just need a good prompt from a rough idea, start with a generator that asks what you're making. Zemith's AI Prompt Generator does that for images, video, chat and edits to your own photo, it's free to try without an account, and when the prompt is ready you can use it in chat or, on a paid plan, make the image or video in the same app. Keep Midjourney Describe or Image to Prompt for when you already have the picture, and the developer consoles for API work.