Compress PDF File Size Online
Reduce your PDF document size without compromising visual readability. Fast, private, and runs entirely in your web browser.
Drop your PDF here to compress & reduce file size
Free, instant, and 100% private. Files never leave your browser RAM.
How to Compress a PDF in 3 Easy Steps
Upload PDF
Drop your PDF file into the dropzone. The document is loaded securely into local browser memory.
Choose Preset
Pick between Recommended (~50% smaller), Extreme (~75% smaller), or Basic (Lossless structural optimization).
Download Instantly
Click “Compress PDF”. Review your before/after reduction stats and download your optimized document.
Frequently Asked Questions
Everything you need to know about compressing PDFs locally with PDFPulse.
How do I compress a PDF file without losing quality?▾
Simply drag and drop your PDF into PDFPulse, choose the 'Recommended Compression' preset, and click 'Compress PDF'. Our client-side engine automatically balances image downsampling (150 DPI) and serializes object streams, dramatically cutting file size while keeping text and diagrams crisp.
Are my confidential files uploaded to any cloud server?▾
No. PDFPulse operates 100% in your local browser using WebAssembly and client-side JavaScript. Your documents remain in volatile browser RAM and are never transmitted over the Internet or stored on any remote server.
What is the difference between Extreme, Recommended, and Basic compression?▾
Extreme Compression minimizes resolution to 96 DPI and 50% JPEG quality for maximum file reduction (up to 80% smaller), ideal for strict email size limits. Recommended Compression balances 150 DPI and 72% quality for everyday business reports. Basic Compression preserves 100% vector sharpness, re-indexing internal PDF streams without modifying any images.
What is the maximum file size I can compress?▾
You can compress PDF files up to 100 MB directly on your device. Because processing is local, you avoid slow upload and download queues typical of cloud-based converters.
100% Client-Side Privacy
Your PDF is compressed locally in RAM. Zero data or bytes are sent to remote cloud infrastructure.
Zero Upload Delays
Skip sluggish upload and download waits. Compression begins instantaneously on your CPU.
Significant Size Savings
Shrink bulky scans, image-heavy presentations, and multi-page documents by up to 80%.