AstroSpike — Add Diffraction Spikes to Astrophotography Images

AstroSpike is a free web tool for astrophotographers. Upload an astrophoto and AstroSpike detects the stars automatically, then renders realistic diffraction spikes on them — the classic four-point Newtonian look, the six-point JWST signature, or spike-free Diffusion halos in each star's own colour — before exporting as JPEG or PNG.

Features

Automatic star detection with hot-pixel, satellite-trail, and galaxy rejection
Subtle, Classic (4-spike), JWST (6-spike), and Diffusion halo presets
Glow halos and a Mist haze in Diffusion mode — the mist-filter look of Milky Way widefields
Adjustable length, chroma, glow, brightness, and rotation — globally or per star
Place stars detection missed, or drag a detection onto the star's true core
High-quality JPEG and PNG export, plus a spikes-only transparent PNG layer
100% client-side processing — your image never leaves your browser

Who is it for?

Astrophotographers who shot with a refractor or other spike-free optics and want to add the classic diffraction-spike aesthetic to their bright stars — without installing software or uploading their image to a server.

DB Astro Suite | GitHub Repository