Complete Midjourney Parameter Reference
Parameters are double-hyphen flags appended to the end of your /imagine prompt. They control aspect ratios, model version engines, aesthetic bias, randomness, and image tiling. Here is the exhaustive engineering guide to every parameter.
1. Master Parameter Quick Reference
| Parameter | Valid Range | Default | Function & Purpose |
|---|---|---|---|
--ar [W:H] | Any ratio (e.g. 16:9, 9:16, 2:3, 4:5) | 1:1 | Changes the width-to-height aspect ratio of the generation. |
--v [version] | 6.1, 6.0, 5.2, 5.1 | 6.1 | Switches the foundational diffusion generation engine. |
--niji [version] | 6, 5 | N/A | Switches to the specialized Japanese anime / illustration model. |
--style raw | raw | Standard | Reduces default artistic smoothing for photo-realism and typography. |
--stylize [0–1000] or --s | 0 to 1000 | 100 | Controls the strength of Midjourney's artistic aesthetic interpretation. |
--chaos [0–100] or --c | 0 to 100 | 0 | Increases diversity and variance across the 4 initial grid quadrants. |
--weird [0–3000] or --w | 0 to 3000 | 0 | Introduces quirky, avant-garde, surreal, and offbeat visual elements. |
--tile | Flag | Off | Generates seamless repeat patterns for wallpaper, textures, and fabrics. |
--seed [integer] | 0 to 4294967295 | Random | Locks the starting Gaussian noise field for reproducible results. |
--no [elements] | Comma-separated words | None | Negative prompting flag to exclude specific objects, colors, or artifacts. |
--stop [10–100] | 10 to 100 | 100 | Halts the diffusion denoising process early for a hazy/unfinished look. |
2. Aspect Ratios: --ar [W:H]
The --ar parameter dictates the dimensions of the generated canvas. Always use whole integers separated by a colon:
--ar 9:16 & --ar 4:5
Vertical orientation ideal for Instagram Reels, TikTok backgrounds, smartphone wallpapers, and Instagram feed portraits.
--ar 16:9 & --ar 21:9
Horizontal wide-screen framing ideal for desktop website hero banners, YouTube thumbnails, and ultrawide cinematic concept art.
--ar 2:3 & --ar 3:4
Classic 35mm photography aspect ratio, standard for magazine covers, poster prints, and editorial portraiture.
3. Aesthetic Controls: Stylize, Chaos & Weird
These three parameters form the creative control triad in Midjourney:
--stylize (or --s)
Controls how aggressively Midjourney applies its artistic aesthetic style:
--s 50: Strict prompt adherence, literal rendering.--s 100: Default balanced baseline.--s 750: Rich painterly flourishes, dramatic color grading, artistic compositions.
--chaos (or --c)
Controls the diversity across the 4 generated grid images:
--c 0(default): Four very similar variations on a single composition.--c 25: Moderate variation in angles and poses.--c 80: Four wildly unpredictable, radically distinct compositions.
--weird (or --w)
Injects surreal, offbeat, dreamlike, and unconventional aesthetic traits:
--w 250: Subtle eccentric flourishes.--w 1000: Avant-garde art gallery surrealism.- Combine
--s 250 --w 500for visually stunning, bizarre concept art.
4. Generating Seamless Repeat Textures with --tile
The --tile parameter is a game-changer for game designers, 3D texture artists, and fashion designers. It forces the left edge to wrap seamlessly with the right edge, and the top with the bottom:
You can test the output in any seamless pattern checker: the tiles repeat infinitely without any visible seams or boundary lines.
5. Seed Control (--seed) for Iterative Refinement
Midjourney uses a random numerical seed (0 to 4,294,967,295) to initialize the starting Gaussian noise field for each generation. If you want to keep the exact same subject and lighting while testing a small prompt change (e.g. changing eye color), lock the seed:
How to Find and Use Seeds:
- React to any completed generation message in Discord with the envelope emoji ✉️.
- The Midjourney Bot will direct message you the exact Seed Number and job ID.
- Append
--seed [number]to your modified prompt to lock the underlying composition.
Parameter Key Takeaways
- Parameters must always be placed at the very end of the prompt after all text.
- Use
--style rawwhen rendering typography in quotes or shooting photorealistic portraits. - Use
--tilefor seamless website backgrounds, game textures, and wrapping paper patterns. - Use
--seedto maintain identical compositional foundations across prompt iterations.
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