Under the hood
How it works — and where its limits are
Page-level problems are the most common PDF annoyances: a scanner fed the sheets in the wrong order, one page
came out sideways, a blank separator page rode along. The Organize tool is built for exactly that tidy-up pass.
It renders every page to a small preview with pdf.js, so you work with what the pages actually look like instead
of guessing from page numbers, and then rebuilds the document with pdf-lib in the order you arranged.
Reordering. Dragging a thumbnail moves the page to a new position; the labels under each
thumbnail always show the new position and where the page came from (“New p.4 · was p.7”), so a long document
stays auditable while you work. Nothing is written until you press Export — closing the tab abandons the edit
session with your original file untouched.
Rotation. The rotate buttons add 90° at a time, in either direction, and the thumbnail
previews the result. On export, your added rotation is combined with the rotation the page already had, and the
sum is written as the page’s rotation in the new file. That matters for scans: a page that was stored
sideways and displayed upright by a viewer flag gets corrected properly, rather than having two half-fixes fight
each other. Rotation here is a page property, not a re-render — the page content itself is not rasterised or
re-encoded, so text stays text.
Deleting. Deleting a thumbnail removes that page from the export list. It does not reach
into your original file — the source on your device is never opened for writing — so a mistaken delete is
recovered by simply loading the file again and starting the tidy-up over. If you delete every page, Export
disables itself rather than producing an empty document.
Fidelity notes. Pages are moved with the same pdf-lib copy mechanism as the merge and split
tools, so visible content is preserved exactly, while interactive form fields and the outline panel are not
guaranteed to carry over. Rotation and order are the metadata this tool exists to fix; for anything deeper —
editing text, redaction — you need a full PDF editor. And as everywhere on this site, the whole session is
local: thumbnails are drawn in your browser, the export is assembled in your browser, and no file information is
sent anywhere.