duo·reader— split view for long docs
Two independent views of the same PDF. Nothing to install.
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duo·reader— split view for long docs - Two independent views of the same PDF. Nothing to install.

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duo·reader is a lightweight PDF split-view reader. View two parts of the same long document side by side, independently — no signup, nothing to install. Split, not synced. Independent scrolling by default. Sync mode only when you want to compare. Nothing leaves your browser. Files stay local. No upload, no account. Pick up exactly where you left off. Pane layout, page, and scroll position are saved automatically.

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Acrobat still does not do independent vertical split of the same file. Split is synced. Window > New Window is two windows. I built duo·reader for that job: one long PDF, two places far apart, side by side, each pane stays put. Read the clause. Keep the definition. Don’t lose your place. Browser only. No signup. File stays local.