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)
- Go to the Merge PDF tool — it can also help you restructure before compressing
- For actual compression, use the Image Compressor on extracted pages from the PDF to JPG tool
- 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