Select File
or drag and drop files here
Select a PDF file to compress
How to Compress PDF Files
Upload your PDF file — stays on your device, never uploaded
Select compression level: Screen (smallest file), Ebook (recommended), Printer (high quality), Prepress (maximum)
Click Process — compression runs in your browser
Download the optimized PDF and compare before/after sizes
Key Features
Four Quality Presets
Screen: Maximum compression, 60-80% reduction. Ideal for web viewing and email attachments. Ebook: Recommended default, 40-60% reduction. Maintains readability on tablets and phones. Printer: Minimal compression, 20-40% reduction. Preserves print-quality output. Prepress: Near-lossless, for professional publishing workflows.
Intelligent Image Optimization
Each PDF page is rendered at the target resolution and re-encoded as JPEG. High-resolution photos downsample without visible quality loss on screens. Applies optimal compression per preset while preserving page layout and dimensions.
100% Private Processing
Compression runs entirely in your browser. Your file never leaves your device, no uploads, no server, no network requests. Works offline once the page has loaded. Suitable for confidential, legal, or sensitive documents.
No File Size Limits
Processing is limited only by your device's available memory, not arbitrary server restrictions. Large PDFs that would be rejected by server-based tools process without issues on modern hardware.
Privacy & Security
PDF compression runs 100% in your browser. Your file is never uploaded to any server — processing happens locally. No data leaves your device at any point. Suitable for bank statements, contracts, medical records, or any sensitive document.
Frequently Asked Questions
How much can PDF compression reduce file size?
Image-heavy PDFs: 60-80% reduction. Mixed content: 40-60%. Text-only PDFs: 20-40% (less opportunity since text is already efficient). Compression amount depends on original image quality and chosen preset. Pre-compressed PDFs may only reduce 10-20%.
Will compression degrade visual quality noticeably?
Ebook: Imperceptible quality loss for digital viewing. Text remains crisp, images acceptable on tablets and phones. Recommended for 95% of use cases. Screen: Visible image degradation — use only for drafts or size-critical email. Printer/Prepress: Near-lossless, maintains print quality.
Is PDF compression reversible?
No. Compression permanently discards image data via downsampling and JPEG re-encoding. Always keep your original as a backup. Never compress the sole copy of an important document.
Does client-side compression work on scanned PDFs?
Yes. Scanned PDFs are image-heavy and compress well — often 60-80% reduction. Processing time depends on page count and your device speed. A 50-page scanned PDF typically completes in 15-30 seconds on modern hardware.
Can I compress password-protected or encrypted PDFs?
No. Encrypted PDFs must be decrypted before compression. Remove the password using a PDF editing tool first, compress, then re-encrypt if needed.
Why does the compressed PDF lose text selectability?
Client-side compression works by rasterizing each page to an image and rebuilding the PDF. This trades text layers for smaller file size. If you need to preserve selectable text, use a server-based tool like Ghostscript instead.