Read every page, not one.
The audit reads a sample of your pages, up to five, and tells you what it sees. This reads the whole site: every internal link followed, every page checked for the things that cost you visitors, and an inventory you can hand to a developer. Free, and it asks for an address so the report has somewhere to go.
Up to 2,000 pages. Keep this tab open while it reads: the report is saved as it goes, so the link works even if you close it.
See a whole-site report from a real site first
What you get
The list, not the prose
One row per page as a spreadsheet file, with the numbers behind every group, so a developer can act on it without reading an essay.
What to fix, in order
Five to seven things, ranked by what they cost a visitor, each with what we saw, what to do, and how to confirm it.
The denominator
How many pages we read and how many links we followed. A report that will not tell you what it read is a guess with a font.