How to compress pdf online
- 1
Drop in the PDF you want to shrink.
- 2
Click Compress and let PDFLark optimise the file.
- 3
Download the smaller PDF, ready for email or upload.
Why use PDFLark's Compress PDF?
- Get under email and upload size limits without losing readability.
- Faster sharing and storage with smaller file sizes.
- Compression happens in your browser — files stay private.
Frequently asked questions
How much smaller will my PDF get?
It depends on the file. PDFs with many images or redundant data compress the most. Documents that are already optimised may shrink only slightly.
Will compressing ruin the quality?
PDFLark optimises the file structure to keep your document clearly readable while reducing size.
Is it really free?
Yes. Every PDFLark tool is completely free with no daily limits, no file-count caps, and no watermarks added to your documents.
Are my files uploaded to a server?
No. All processing happens locally in your browser using JavaScript. Your files never leave your device, which is why PDFLark works even on private or confidential documents.
Do I need to create an account?
No account, no email, and no sign-up. Open the tool, add your file, and download the result.
Which browsers and devices are supported?
PDFLark works in any modern browser — Chrome, Firefox, Safari, and Edge — on Windows, macOS, Linux, iPhone, and Android.