Merge, split, rotate, and convert PDFs — all client-side.
PDFs are the file format most likely to carry something you should not upload: contracts, medical records, financial statements, scanned IDs, legal correspondence. The PDF tools — merge, split, rotate, JPG-to-PDF assembly, and PDF-to-image rendering — all run in your browser using pdf-lib and pdf.js, so a sensitive document stays on your machine.
The tools cover the operations a small business, freelancer, or anyone managing paperwork actually needs day to day. Merge a cover letter and a CV into one attachable file. Split a multi-invoice PDF into one file per invoice for bookkeeping. Rotate scanned pages that came out sideways. Combine a stack of receipt photos into a single PDF for an expense claim. Render a PDF's pages as PNG or JPG images for previews or embedding in a presentation. They are deliberately focused — for editing the content of a PDF or applying OCR, you want a dedicated PDF editor — but for everyday rearrangement they are exactly what you want.