Compress PDF
Make your PDF smaller for email, uploads, and sharing. Fast and private.
Drag your PDF here or click to choose
Single file, up to 100MB
When to Use This Tool
Reduce PDF file size while maintaining document quality. This tool removes unused objects and optimizes internal streams to make your PDF smaller. Everything runs in your browser — no uploads, no server processing.
PDF compression becomes necessary when files are too large to attach to emails, upload to online portals, or share via cloud storage. Many email providers limit attachments to 10-25MB, government portals often enforce 5MB caps, and file-sharing platforms may have size restrictions. Compressing your PDF helps you get past these limits without losing document usability.
The degree of compression depends on what's in your PDF. Documents with high-resolution images, embedded fonts that aren't used, and redundant metadata can shrink significantly. Text-heavy documents with minimal images may see modest size reductions. The tool preserves visual quality while removing invisible bloat.
Common scenarios include shrinking scanned contracts for email submission, reducing academic thesis files for upload to university portals, compressing design portfolios for client sharing, and downsizing reports to meet storage quotas.
How to Compress PDF
- Upload your PDF file (drag & drop or click to browse)
- The tool automatically analyzes and compresses the PDF
- Preview the original and compressed file sizes
- Download your smaller PDF instantly
Features
- Automatic compression optimization
- Removes unused objects and redundant metadata
- Preserves text quality and image clarity
- Shows file size reduction percentage
- 100% browser-based processing (no server uploads)
- Works with scanned and digital PDFs
Things to Know
Already-compressed PDFs won't shrink much — if a file has already been optimized, there's little left to remove. Image-heavy documents compress more than text-heavy ones because images are the main contributor to file size. Aggressive compression may slightly reduce image quality, but text remains sharp. Some PDF creation tools embed entire font files even when only a few characters are used — this tool removes unused font subsets to save space.
Frequently Asked Questions
How much smaller will my PDF get?
Results vary. Documents with lots of unused objects, redundant metadata, or high-resolution images can shrink 30-70%. Text-heavy PDFs with minimal images may see more modest reductions of 10-20%.
Does compression affect document quality?
No visible quality reduction. The tool removes unused internal objects and optimizes data streams without altering text readability or image clarity. Content looks identical to the original.
Can I compress password-protected PDFs?
No. You must first unlock the PDF using our Unlock PDF tool, then compress the unprotected file. Encrypted content cannot be accessed for optimization.
Why is my PDF file so large?
Common causes include embedded fonts that contain entire character sets but use only a few glyphs, high-resolution images, redundant editing data from PDF creators, and extensive metadata. This tool removes these unnecessary elements.
Will compression make text harder to read?
No. Text remains perfectly readable. Compression targets unused internal data and stream optimization, not visual content. The document appears exactly the same when opened.
Built for shrinking PDFs to meet email attachment limits, upload requirements, and storage constraints. Continue with Merge PDF or PDF to JPG.
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