SVG Path Data Length Walker

Paste any SVG d attribute and the walker tokenizes the full command stream — M m L l H h V v C c S s Q q T t A a Z z, implicit repetitions, compact arc flags like "0 1150 30" — and rebuilds every segment in absolute coordinates. Each segment gets a precise arc length: exact formulas for lines, adaptive Simpson quadrature (relative tolerance 1e-9) for cubic and quadratic Bézier speed integrals and elliptical arcs, and analytic extrema (derivative roots) for tight bounding boxes instead of sampling. The command table shows start/end distance along the path, so any stroke-dasharray / stroke-dashoffset animation can target an exact command boundary, with ready-to-copy snippets in both raw-user-unit and pathLength="1" normalized forms. S and T commands resolve their reflected handles so you can see the actual vector field the renderer uses; A commands are solved through the SVG 2 endpoint→center parameterization, reporting center, θ1, Δθ, and applying the spec radii-scaling rule when the chord is longer than 2·rx/2·ry. An optional viewBox gets an alignment audit: overflow, margins, centering offset, and a suggested tight viewBox.