PDF tools

The names overlap enough to be confusing, so here is the short version. Merge takes several PDFs and produces one. Split does the reverse: it pulls a selection of pages out into a new file, or cuts one document into two.

Delete pages is split's mirror image. You name the pages you want gone instead of the ones you want kept, which is much faster when you are removing three pages from thirty.

Reorder keeps every page but changes the sequence, which is what you want when a scanner fed the document backwards. Rotate fixes pages that went in sideways, and writes the correction into the file so it survives being emailed.

Converting

PDF to images renders pages into PNG or JPEG pictures, for when you need a picture rather than a document. Images to PDF does the reverse and turns photos or scans into one document. Extract text pulls the words out as plain text — provided the PDF has a text layer and is not a scan.

Marking and finishing

Watermark stamps text such as CONFIDENTIAL across every page. Page numbers inserts numbering, with the option to leave a cover page clean. Crop trims margins and scanner borders, and two pages per sheet halves what you print.

Before you send it

Remove metadata shows what your file quietly says about you — your name, your software, when you really wrote it — and strips it. Flatten form locks the answers in a filled form so the recipient cannot edit them.

One architecture

All Eighteen work the same way. This site has no backend — it is static files on a CDN — so the parsing and rewriting is done by JavaScript running on your processor. That is why there is no upload progress bar, no queue, no size limit beyond your own memory, and why the tools keep working if you disconnect from the internet after the page loads.