Compress PDF files

Reduce the file size of your PDFs instantly with a sleek and modern experience.

Select PDF files

or drag & drop your PDFs here

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About the Compress PDF Tool

Large PDFs — especially ones full of scanned images or high-resolution graphics — can be a hassle to email or upload where file size limits apply. PDF Reducer's Compress tool reduces PDF file size by optimizing embedded images, fonts, and internal structure, while trying to keep the document as visually close to the original as possible.

How to compress a PDF

1. Upload one or more PDF files you'd like to shrink.
2. The tool automatically tries several compression methods and keeps whichever result is smallest without corrupting the file.
3. Review the reported before-and-after file size.
4. Download your compressed PDF (or a ZIP if you compressed multiple files at once).

Why use PdfReducer's Compress PDF tool

Multiple compression strategies are tried automatically so you get the best available result for that specific file.
If a file is already well-optimized and can't be shrunk further, you still get back a valid, unmodified PDF rather than a broken one.
Works on multiple files in a single batch.
No visible watermark is added to your compressed file.

Frequently asked questions

Will compressing reduce the visual quality of my PDF?

Compression targets redundant data, embedded fonts, and image encoding — some image-heavy PDFs may see a small quality trade-off in exchange for a meaningfully smaller file size.

What if my PDF is already small?

If a file can't be compressed further without exceeding its original size, the tool returns it unchanged rather than making it larger.

Can I compress several PDFs at the same time?

Yes, select multiple files and they'll each be compressed and returned together in a ZIP archive.