GPTengine is a free AI prompt generator that turns plain ideas into advanced production-grade prompts for image and video generation models. It supports Nano Banana 2, GPT-Image, Midjourney, Flux, Veo, Sora, Kling, Seedance and Runway Gen-4.

Is GPTengine free to use?

Yes. GPTengine is completely free with no signup required. Users can optionally support development through the Buy Me a Coffee link.

Which AI models does GPTengine support?

GPTengine generates prompts compatible with all major image and video AI models including Nano Banana 2, GPT-Image 2.0, Midjourney v7, Flux 1.1 Pro, DALL-E, Google Veo 3, OpenAI Sora, Kling 3.0, Seedance 2.0, and Runway Gen-4.

How does the video prompt generator work?

Enter your idea, select an aesthetic style and mood, choose an aspect ratio and duration between 3 and 60 seconds. GPTengine builds a full cinematic prompt with a sequence breakdown timed to your chosen length, camera language, lighting design, motion physics, and a tailored negative prompt.

[ GPTE-04.7 ] GPTENGINE // AI PROMPT SYNTHESIS ENGINE

DOCUMENT_REF: GPTE.LIVE-2026 / PUBLIC RELEASE

● FREE — NO SIGNUP — LIVE SYNTHESIS

AI Prompt Generator for Image & Video

Turn any idea into a production-grade prompt engineered for the latest AI models — Nano Banana 2, GPT-Image, Midjourney v7, Flux, Veo 3, Sora, Kling 3.0, Seedance 2.0, Runway Gen-4. No guesswork. Just signal.

◊ NEURAL.MESH // LIVE 2048Hz

◆ NANO BANANA 2GPT-IMAGE 2.0◆ MIDJOURNEY V7FLUX 1.1 PRO◆ DALL-E 4SEEDANCE 2.0◆ KLING 3.0VEO 3◆ SORARUNWAY GEN-4 ◆ NANO BANANA 2GPT-IMAGE 2.0◆ MIDJOURNEY V7FLUX 1.1 PRO◆ DALL-E 4SEEDANCE 2.0◆ KLING 3.0VEO 3◆ SORARUNWAY GEN-4

01 / SYNTHESIS

THE forge

INPUT → ANALYSIS → ENGINEERING → OUTPUT
NB2 / GPT-IMG-2.0 / CINEMATIC VIDEO

INPUT.SOURCE — RAW IDEA

0 / 500

◊ ENGINEERING PARAMETERS

AESTHETICCINEMATIC

MOODDRAMATIC

INTENSITY0.75

ASPECT RATIOAUTO

VIDEO LENGTH10s

PARAMS: 3 // READY

OUTPUT.STREAM — IMAGE PROMPT

STANDBY

AWAITING SIGNAL

Submit an idea on the left.
The forge will engineer a production-grade prompt.

02 / METHODOLOGY

HOW IT thinks

A 4-STAGE PIPELINE
CALIBRATED PER MODEL

◊ PARSE

Deconstruct intent

Extracts subject, action, environment, and mood signals from raw input. Identifies missing context.

◊ ENRICH

Inject specificity

Adds camera language, lighting setup, lens specs, color palette, and texture vocabulary calibrated to the chosen model.

◊ STRUCTURE

Order by weight

Reorders tokens by influence priority. Front-loads what matters most to the target model's attention.

◊ TUNE

Model-specific syntax

Wraps output in the exact syntax modern generation engines prefer — image and video each get their own optimised shape.

03 / SAMPLES

TRY these

CLICK ANY CARD TO LOAD INTO FORGE
CURATED INPUTS

// 2K26 SPORTS

"LeBron dunking over a defender at the buzzer"

◆ 2K26◆ EPIC

// 3D AAA RENDER

"a luxury watch with octagonal bezel on black marble"

◆ 3D AAA◆ LUXURIOUS

// CYBERPUNK

"cyberpunk street vendor cooking in neon rain"

◆ CYBERPUNK◆ DYSTOPIAN

// GHIBLI

"a girl in a yellow dress running through wheat at sunset"

◆ GHIBLI◆ NOSTALGIC

// FASHION CAMPAIGN

"a model in sculptural black gown against red backdrop"

◆ FASHION◆ LUXURIOUS

// FILM NOIR

"a man lighting a cigarette in a rainy alleyway"

◆ NOIR◆ MYSTERIOUS

// VIDEO

"paint exploding in zero gravity, swirling into a face"

◆ 3D AAA◆ ETHEREAL

// PIXAR / 3D ANIM

"a tiny dragon hatching on a librarian's desk"

◆ PIXAR◆ WHIMSICAL

// REALISTIC

"a coffee shop window at golden hour, steam rising"

◆ REALISTIC◆ SERENE

04 / ACCESS

UPGRADE tier

UNLOCK UNLIMITED GENERATIONS
CANCEL ANYTIME

GPTengine is free to try. Upgrade for unlimited generations, priority synthesis, advanced model targeting, and early access to new features.

MONTHLY

FLEXIBLE

$ 5 / month

Billed monthly. Cancel anytime.

✓ Unlimited image prompts
✓ Unlimited video prompts
✓ All 20 aesthetic styles
✓ All 12 mood profiles
✓ Custom aspect ratios & video lengths
✓ Priority synthesis (no queue)

SUBSCRIBE MONTHLY →

BEST VALUE — SAVE 25%

YEARLY

POPULAR

$ 45 / year

~~$60~~ Just $3.75 / month, billed annually.

✓ Everything in Monthly
✓ 25% savings vs monthly
✓ Early access to new styles & engines
✓ Advanced model targeting
✓ Priority email support
✓ Annual billing only — no surprises

SUBSCRIBE YEARLY →

LIFETIME

ONE-TIME

$ 100 / once

One payment. Yours forever.

✓ Everything in Yearly
✓ Pay once, use forever
✓ All future updates included
✓ Founding member badge
✓ Direct line for feature requests
✓ No recurring charges, ever

BUY LIFETIME →

All payments processed securely via PayPal. Subscriptions can be cancelled anytime from your PayPal account. See Refund Policy for details.