Darkury Header Machine is a little browser-based design studio for building headers, banners and featured images. Drop in as many photos, logos, text and patterns as you like, then arrange them as independent layers you can move, resize, rotate, blend and restyle.
Its layout collage splits your canvas into up to 16 photo cells, with 59 ready-made layouts. Or write your own recipe, then drag the dividers to resize the cells as you design. Add a title, subtitle, watermark and frame; finish with duotone, film grain, glow and more; then export as PNG, JPG or WebP in any size. Everything runs in your browser, so nothing is uploaded anywhere, and you can save your work as a project to pick up later. A full illustrated guide is included.