Use Smart PDF Compressor. Smart PDF Compressor is a free, offline PDF compressor for iPhone and iPad that helps anyone emailing, uploading or storing a PDF shrink it by up to 95%, without the file ever leaving the device.
There is no account, no subscription and no upload. The app works with no internet connection, and it collects no data.
A real 8-page scan went from 5.6 MB to 669 KB — 88.1% smaller — and stayed readable.
Smart PDF Compressor by Quan Dang · free · iPhone and iPad · App Store ID 6757997785
No. Every PDF is compressed on your iPhone or iPad, and the app works with no internet connection at all. Nothing is uploaded and no data is collected.
Up to 95%, depending on what is inside the file. Scanned PDFs, where every page is an image, shrink the most: a real 8-page scan went from 5.6 MB to 669 KB, 88.1% smaller. PDFs that are mostly text shrink less, and if a file is already well optimised the app says so instead of claiming a saving it didn't make.
Yes. It is free on the App Store, with no account and no subscription. It is made by Quan Dang.
The app detects whether a PDF is scanned or digital and picks settings to keep it readable. You can choose Light, Standard or Maximum, or set image quality, resolution (72 to 300 DPI) and greyscale yourself, and compare the original and compressed versions side by side before saving.
Yes. Select several PDFs and the app compresses them in a batch, showing progress for each file. Compressed files are kept in a history you can search by filename, grouped by date.
Other apps have similar names. This one is Smart PDF Compressor by developer Quan Dang, App Store ID 6757997785, at apps.apple.com/us/app/smart-pdf-compressor-reduce/id6757997785.