Ctrl+F for equations
Type a formula in LaTeX and every place it appears in the PDF is highlighted. Your browser's own find can't search maths, because a PDF stores a formula as scattered symbols, not as text.
Or try a sample
PDF viewer:
Enter goes to the next match and Shift+Enter to the previous one.
Install for every PDF you open
The browser extension adds this search to any PDF you read: on arXiv, journal sites, course pages, or files on your computer. Click its button on a PDF, or right-click a link to a PDF. It's free and needs no account.
Found a bug?
If a search misses a formula that's in the PDF, marks the wrong place, or a PDF won't open, tell us here and we'll fix it. How a PDF stores its maths varies from paper to paper, so every report helps.