Compress PDF
Reduce PDF file size by stripping metadata and optimising the document structure.
Click to upload a PDF
or drag and drop
How to compress a PDF
- 1Click the upload area and select a PDF file from your device.
- 2Click Compress PDF to optimise and reduce the file size.
- 3See the before/after sizes, then download your compressed PDF.
Why choose Ultraconvert?
Fast, private, and secure PDF compression
100% browser-based
PDF compression runs entirely in your browser. Files never leave your device.
Metadata stripped
Removes author, creator, and producer info that bloats the file.
Private & secure
No uploads, no tracking, no data storage.
Structure optimised
Uses object streams (deflate) to compress cross-reference tables.
No quality loss
Only overhead is removed — page content and images are untouched.
Fast processing
Instant compression even for large PDFs.
Frequently asked questions
Everything you need to know about PDF compression
Are my PDFs uploaded to your server?
No. All compression happens locally in your browser. Your PDF never leaves your device.
How much will my PDF shrink?
Results vary by file. PDFs with lots of metadata or unoptimised structures typically shrink 5–30%. Files already well-optimised may see minimal reduction.
Will my PDF quality be affected?
No. This tool only removes metadata and optimises the document structure. Page content, images, and fonts are completely untouched.
Is there a file size limit?
There is no fixed limit, but very large PDFs may take longer to process depending on your device.
Is this tool free?
Yes. Completely free with no watermarks or restrictions.