What is the Compress PDF tool?
Compress PDF reduces the size of any PDF document so it can be emailed, uploaded or shared without bumping into upload limits. Most files shrink dramatically because typical PDFs ship with embedded duplicates, uncompressed object streams and bloated metadata that don't affect what you see.
The output is still a fully standard PDF — it opens in any reader, prints the same, and keeps every page, font, link and form field. We don't downscale your images or rasterise anything by default; we simply re-pack the file using PDF's own compression formats.
How to compress a PDF
- Click 'Choose files' or drop one or more PDFs onto the page.
- Open the options panel to pick a compression profile or leave it on the default for a balanced shrink.
- Click 'Convert & download' to receive the optimised PDF. We'll show you the percentage saved on the success screen.
Why use our Compress PDF tool?
- Lossless object-stream and content-stream compression — visual quality is preserved.
- De-duplicates fonts and images that appear multiple times in the document.
- Works on multi-megabyte reports, scanned books and image-heavy PDFs alike.
- Shows the before/after byte count and the percentage saved so you can tell at a glance if it worked.
Frequently Asked Questions
Will compression blur or pixelate the document?
The default profile is lossless — it only re-compresses how the file is stored, not what it shows. Images, vectors and text remain visually identical.
My PDF didn't shrink. Why?
Some PDFs are already optimised, especially those exported by modern tools. If the file is mostly high-resolution scans, the original bytes are already as compact as JPEG can make them.
Can I compress multiple PDFs at once?
Yes. Drop several PDFs in and you'll get a single ZIP back with one compressed file per input.
Is metadata preserved?
Document title, author, creation date and similar metadata are kept by default so the file still identifies itself the same way.