How to Compress PDF File Size

You need to email a PDF, but it's 15MB and your email limit is 10MB. Or a form says "max file size: 5MB." Here's how to shrink it.

Why PDFs Get Large

• Embedded images — high-resolution photos bloat PDFs
• Unoptimized fonts — embedded font files add MBs
• Scanned pages — each page is essentially a full-size image
• Unused objects — editing history and metadata

How to Compress (The Quick Way)

1. Go to the Merge PDF tool — it can also help you restructure before compressing
2. For actual compression, use the Image Compressor on extracted pages from the PDF to JPG tool
3. Rebuild your PDF with optimized images

What to Expect

| Original | After Compression | Savings | |----------|------------------|---------| | 15 MB | 3–5 MB | 67–80% | | 5 MB | 1–2 MB | 60–80% | | 1 MB | 300–500 KB | 50–70% |

Pro Tips

• Don't over-compress — below 150 DPI, text becomes hard to read
• Check the result — always open the compressed PDF to verify readability
• Consider splitting — if one PDF is huge, split it into chapters with our merge/split tools

Related Tools

• PDF to JPG — extract pages as images for optimization
• JPG to PDF — rebuild PDF from optimized images
• Merge PDF — combine or reorder pages