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AttachKit

AttachKit browser extension

Open the PDF in your current tab in AttachKit with one click. The extension fetches the bytes in your browser, opens AttachKit, and passes them via postMessage. No upload, no third-party server.

Install (developer mode)

We'll list this on the Chrome Web Store once it's out of beta. Until then, load the unpacked source:

  1. Clone the AttachKit repo or download a ZIP.
  2. Open chrome://extensions and toggle Developer mode on.
  3. Click Load unpacked and pick the extension/ folder.
  4. Open any PDF in a tab (Chrome's built-in viewer works). Click the AttachKit toolbar icon — pick Sign, Fill, Redact, or Make searchable.

What it can do

  • Sign this PDF — opens the PDF in /app/sign with your signature library ready.
  • Fill this PDF — opens in /app/fill so you can auto-fill from your saved profile.
  • Redact PII — opens in /app/redact to scan + black out sensitive text.
  • Make searchable (OCR) — runs OCR on a scanned PDF and writes an invisible text layer underneath.

Privacy posture

The extension requests <all_urls> host permission so it can fetch PDFs from any origin (the popup, not the page you're visiting). The extension does not phone home, does not collect analytics, and does not send the PDF to any remote server. Bytes go from the source tab → the extension → the AttachKit tab, all within your browser process.