Email rejected your 12MB attachment? Learning how to compress a PDF saves the day — most portals cap uploads at 2–10MB.
Compress a PDF in 3 steps
- Open the free compressor below.
- Choose your PDF (max 25MB).
- Click Compress PDF — you get before/after sizes with the download.
What actually shrinks a PDF?
Re-saving with compact object streams trims structural overhead — a few percent on typical files. The real weight in most PDFs is images: if your file is scanned pages or photo-heavy, convert pages to JPG at lower quality first, or rebuild via the JPG-to-PDF tool, for dramatic savings.
Tips
Text-first PDFs (contracts, resumes) barely compress because text is already tiny — that is normal, not a failure. For email limits, also try splitting the file and sending parts.
FAQ
Will quality drop? No — stream compression is lossless. Only image downsampling loses quality, which this tool does not do silently.