PDF Compressor
Reduce PDF file size using lossless compression.
Click to upload a PDF to compress
Reduce PDF file size in-browser
Compress PDFs using lossless structural optimisation: object stream compression and metadata removal. Best for PDFs with redundant structure. No images are recompressed, so quality is preserved.
Frequently asked questions
- How much can this tool reduce my PDF size?
- Results vary. PDFs with redundant cross-reference tables, unused objects, or verbose metadata can shrink by 10–40%. Tightly-optimised PDFs from professional tools may not shrink at all. Image-heavy PDFs benefit most from compressing the source images before converting to PDF.
- Why is my compressed PDF not smaller?
- Many modern PDF generators already apply object compression. If the PDF was created by Chrome's print-to-PDF, Adobe Acrobat, or Word's export, it is likely already well-optimised. For image-heavy PDFs, use the Image Compressor first, then convert to PDF.
- Does compression affect PDF quality?
- The compression used here is lossless — it only removes structural overhead and metadata, not image or text data. Visual quality is identical to the original.