Features

Everything that makes USTOOLS ONLINE fast, private and dependable.

Local-first processing

The tools that can run in a browser do run in a browser. Merging, splitting, rotating, watermarking, cropping, page numbering, image conversion and text extraction all execute against pdf-lib and pdf.js inside your own tab.

There is no upload step, no temporary storage bucket and no processing queue for these operations, which removes an entire class of privacy and reliability problems.

  • Zero-upload architecture for 21 tools
  • No account, quota or watermark
  • Works offline once the page has loaded

A pluggable conversion layer

Office documents, OCR, PDF/A and e-book formats need native engines such as LibreOffice, Ghostscript, Tesseract and qpdf. Those tools are routed through a provider abstraction with an explicit priority order, so a failed or unconfigured provider falls through to the next capable one.

Providers are interchangeable: CloudConvert, Adobe PDF Services or your own self-hosted worker container.

Upload and download experience

Drag and drop with multi-file queues, reordering, per-file removal, validation against MIME type and extension, a 200 MB per-file guard, live progress reporting, retry on failure and ZIP packaging when a run produces many outputs.

Design and accessibility

A mobile-first responsive interface with full dark mode, semantic landmarks, labelled form controls, visible focus states and keyboard-operable navigation throughout.