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PDF Toolkit

Securely merge, split, and optimize PDF files in your browser.

Drag & drop or click to upload multiple PDFs

PDF files up to 100MB

Secure PDF Manipulation

YuliusBox PDF Toolkit runs entirely in your browser using WebAssembly. Unlike other online tools that upload your sensitive documents to a server, our tool processes everything locally. This guarantees that your contracts, invoices, and personal files never leave your device.

How to merge PDFs

  1. Select the "Merge PDF" tab above.
  2. Drag and drop multiple PDF files into the upload area.
  3. Reorder the files by dragging them in the list if needed.
  4. Click "Merge Files" to generate and download the combined PDF.

Frequently Asked Questions

Do you save my documents?▼

Never. All processing is strictly local (client-side). We cannot see, save, or access your files.

Is there a page limit?▼

Generally no, but performance depends on your device's memory. Merging hundreds of pages is usually fast and stable.