PDF Hypercompressor

Make scanned PDFs tiny — and keep every word searchable. 100% in your browser.

🔒 Private — never leaves your device Up to 4× smaller 🔎 Stays searchable 📡 Works offline 🚫 No upload, no account
Drop a PDF here
or click to choose
Getting ready…
Ready.

FAQ

Is my file uploaded anywhere?

No. Everything runs inside your browser — the PDF never leaves your device, and there's no server.

How much smaller will it get?

Scanned or photographed documents usually shrink 3–5×, while keeping the original look and staying fully selectable and searchable.

What kind of PDFs work best?

Scans and photos of text documents. PDFs that are already digital text won't shrink much.

Why does the first run download a lot?

It fetches the compression and text-recognition engines once. Your browser caches them, so later runs are instant — and it then works offline.

Which languages can it read?

129. It auto-detects the document's language when you compress and lets you override.

Is it free?

Yes, and open source (AGPL-3.0).

🤓 For nerds

Each page is rebuilt as MRC (Mixed Raster Content): a crisp 1-bit text mask (CCITT G4) over two heavily-compressed JPEG layers — the text-colour foreground and the paper background — plus an invisible OCR text layer for search.

It's all WebAssembly, client-side:

Open the browser console to watch the per-page pipeline. The MRC segmentation is derived from the Internet Archive's archive-pdf-tools.