What the intensity slider changes
At zero the output is the font, unchanged. As intensity rises, seven transforms scale together: alternate letterforms are chosen more often, each letter shears by a random angle up to four degrees at full intensity, the baseline wobbles by up to six hundredths of an em, spacing between joined letters varies by up to three percent, downstrokes gain weight and upstrokes lose it, small ink pools appear at stroke ends and sharp turns, and, for raster exports only, ink bleeds into paper grain. The presets map to how a hand looks when clean, neat, natural, quick or hurried.
Seeds and sharing
The generator uses a seeded random number stream, so nothing is random twice. The seed is visible and editable; Regenerate increments it, Variation keeps it and steps a secondary value. Both live in the link fragment together with the text, font and intensity, and the fragment never reaches a server, so sharing a link shares the exact render without sharing anything with us.
Fonts that respond best
Faces with alternates and swash variants show the most natural variation: Caveat, Dancing Script and Kalam ship stylistic sets that the simulator can draw on. Highly formal faces such as Great Vibes have one shape per letter and vary only through slant, baseline and pressure, which still reads as handwritten at intensity 0.3 and above.
Limits worth knowing
The simulator moves and reshapes outlines; it does not invent letterforms, so it cannot imitate a specific person's hand or your own. For that you need a font made from your writing. What it does well is remove the mechanical sameness that makes typed script look typed, which is usually all a card, an envelope or a mock-up needs.
Exporting
The export panel writes PNG at up to 600 DPI, JPG, WebP, SVG and PDF. Because the simulator changes the outlines rather than layering an effect, the SVG contains the varied letterforms themselves; only paper texture and bleed are raster-only. A seeded render exported today and re-exported from the same link next month will match, which matters when a design is approved and then reprinted.