How to use Resize PDF
- 1
Drag and drop your PDF files into the upload area, or click “Select files”.
- 2
Check the options — they are already pre-set for this page.
- 3
Click “Resize PDF”. Your file is processed in RAM in a few milliseconds.
- 4
Download the result, or continue with another tool without uploading again.
🛡️ Zero-Storage Architecture
Your files are processed in volatile RAM and never written to disk.
- ✓ In-memory processing, memory released immediately
- ✓ No account, no copy kept, no document logs
- ✓ HTTPS encryption in transit
Standard paper sizes
Frequently asked questions
Is Resize PDF really free?+
Yes. UnboltPDF is free and unlimited: no sign-up, no watermark, no daily quota. The service is financed by advertising.
Are my files safe?+
Your files are processed in volatile memory (RAM) and are never written to a disk. The memory is released as soon as the result is sent back to you. We do not keep copies or log document contents.
What is the maximum file size?+
You can upload up to 50 MB per task, and up to 40 files for tools that accept several files.
Does it work on phones, Mac and Windows?+
Yes. Everything runs in your web browser: Chrome, Safari, Firefox and Edge on desktop, Android and iPhone. Nothing to install.