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Merge a focus-bracketed series into one photo sharp front to back. Free, no install, on Mac, Windows, Linux or Chromebook; the frames never leave your computer.

Near and far limits, hyperfocal distance, and the number other calculators skip: the focus step and frame count a stack needs at your aperture.

What focus stacking and focus bracketing are, how to shoot a series that will merge (step, overlap, aperture, magnification), and the five things that break a stack.

The exact steps for a focus stack in Photoshop with Auto-Align Layers and Auto-Blend Layers, where it produces halos, and when a dedicated stacker does better.

Lightroom does not merge focus stacks. The two routes that exist: the Photoshop round-trip, and exporting the frames to a stacker that runs in your browser.

Affine alignment on gradients, a Laplacian-pyramid vote for the sharpest source at every scale, two passes so memory stays flat, and every request the page makes.

Who makes Focus Stacks, why it runs in the browser rather than on a server, and how it is paid for.

How to reach Focus Stacks, what to include in a report about a stack that failed, and what response to expect.

Every page on Focus Stacks, grouped by what it is for: the stacker, the calculator, the guides and the legal pages.

Frames never leave the device. What the cookieless analytics counts, what advertising may do after consent, and the network requests the page makes.

The terms under which the stacker and the calculator are offered: free, as-is, your files are yours.

The stacker stores nothing. Analytics sets no cookie. Advertising, when switched on, may — after you choose.

The open-source material this site carries and the licences it carries it under.