Shrink big PDFs — without uploading them
The PDFs that clog inboxes and bounce off upload limits are almost always scans and image-heavy documents: a phone-scanned contract, a photographed form, a slide deck full of screenshots. Each page is stored as a large image, so a 20-page scan can easily be 50–100MB. Mynify shrinks them in your browser — the file is never sent to a server, which matters when the document is a contract, an ID, or medical paperwork.
How it works
Mynify opens your PDF locally, re-renders each page at a sensible resolution, re-encodes it efficiently, and reassembles a fresh PDF — showing progress page by page. Because it re-renders pages, this works best on scanned and image-heavy PDFs and shrinks them a lot. For a PDF that’s already just text there may be nothing to gain, so if the result would be larger than your original, Mynify keeps your original automatically — no file ever comes out bigger than it went in.
The trade-off to know
Compressing flattens each page to an image, so the pages look identical but the text is no longer selectable or searchable. That’s exactly what makes scans compress so well. If you need to keep selectable text, hold on to your original.
Tips
- Scans compress best — the more image data a page holds, the more there is to save.
- Use a laptop for very large files — a 100-page high-resolution scan is memory-hungry.
- Merging first? Merge your scans, then compress the combined file for email.
Free, unlimited, no signup, no watermark — your document stays on your device start to finish.