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About this tool
Build an AI logo prompt from mark type, shape language and palette, with stroke, clear-space and favicon limits computed for you.
The Logo Prompt Generator composes an image-model prompt for a logo from your chosen mark type, shape language, palette strategy and style era, and computes the reproduction limits the mark must survive — minimum stroke weight, element budget, clear space and the print raster size. The limits follow from raster physics (a feature narrower than one device pixel vanishes) and the standard brand-guide convention of clear space equal to half the mark height. It is built for founders and designers who want a usable symbol, not just a pretty picture.
Open Logo Prompt Generator on AltFTool — it loads instantly in your browser.
Type a 'Brand name' and choose 'Mark type', 'Shape language', 'Palette strategy', 'Style era' and 'Construction grid'.
Enter 'Smallest reproduction size (px)', 'Smallest print height (mm)' and 'Print resolution (dpi)' — these drive the reproduction limits.
Press 'Copy prompt' for the prompt and negative prompt, and check 'Minimum stroke weight', 'Element budget', 'Clear space' and 'Print raster height'.
Stroke weight and element budget are computed from your smallest reproduction size; clear space follows the standard half-mark-height convention at the reference artboard size.
Each of the seven mark types comes with when-to-use advice and its known trade-off.
The negative prompt always blocks photorealism, 3D bevels and mockups, plus lettering the model would garble for symbol-only mark types (pictorial, abstract, mascot) that shouldn't show text.
Name the mark type (wordmark, lettermark, pictorial, abstract, combination, emblem or mascot), one shape language, one palette strategy and a flat plain background, then add negatives like 'no mockup, no 3D, no drop shadow'. Vague prompts like 'modern minimal logo' produce generic marks; the structure matters more than the adjectives.
Because it has too many elements and too-thin strokes. At 32 px you have room for roughly 8 distinguishable shapes (about 4 px per element), and any stroke thinner than 1/32 of the mark's height — about 3.1% — disappears entirely. Generate with the smallest size in mind, not the large hero render.
Not reliably — diffusion models routinely garble lettering, especially at small sizes. The standard workflow is to generate the symbol only, then set the brand name in real type in a vector editor such as Figma, Illustrator or Inkscape and build the lockup manually.
At least the physical size times the print resolution: a 10 mm tall mark at 300 dpi needs a raster at least 119 px high (10 / 25.4 x 300, rounded up). In practice you should hand printers vector artwork (SVG, PDF or EPS) so the question never arises; rasters are a fallback only.