100% in your browser
Compress PDF files without losing quality
Reduce your PDF file size in seconds with a free online compressor. Choose the target size that fits your needs nothing is ever uploaded to a server.
Drag & drop your PDF here
or click to browse
Browser-Based
All processing happens locally in your browser
No Uploads
Your files never leave your device
No Account
No sign-ups, no personal data required
No Tracking
We don't track your documents or content
Client-Side
Powered by your device, not a remote server
Fast & Free
Instant compression with no hidden costs
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Compression tools
Pick a target, get a smaller PDF
Compress PDF under 500 KB
Perfect for email attachments that keep bouncing back.
Compress PDF under 300 KB
A balanced trade-off between quality and size.
Compress PDF under 200 KB
Ideal for document uploads and portals with tight limits.
Compress PDF under 100 KB
Maximum compression when every kilobyte counts.
Custom compression
Pick Low, Medium, High or Maximum and preview the trade-off.
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Process
How it works
Upload PDF
Drag in a file or browse from your device.
Choose compression
Pick a target size or a quality level.
Compress
Your browser does the work nothing is sent anywhere.
Download
Save your smaller PDF, ready to send.
Why Shrinklyy
Built to be trusted with your files
Fast compression
Most PDFs compress in a few seconds, even large ones.
Secure processing
Your document is processed locally and never stored.
Works in the browser
No installs, plugins, or accounts required.
Mobile friendly
Compress PDFs from your phone just as easily as desktop.
Unlimited usage
Compress as many files as you need, free of charge.
No watermarks
Your files come back exactly as they went in, minus the size.
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FAQ
Frequently asked questions
Everything you need to know about compressing PDFs online with Shrinklyy.
Yes. Every compression tool on Shrinklyy is completely free to use, with no limit on how many PDFs you compress. There are no hidden charges, subscription fees, or premium tiers. Free PDF compression for everyone.
Drag your PDF file onto Shrinklyy, pick a target size (500KB, 300KB, 200KB, 100KB, or custom), and click Compress. Your browser does all the work locally, so your file stays private. Download your smaller PDF instantly. No software installation needed.
No. Shrinklyy compresses your PDF directly in your browser using your device's own processing power, so your file never leaves your computer or phone. Unlike other online PDF tools, we never upload your document to any server. This makes Shrinklyy one of the most secure PDF compressors available.
Some quality trade-off is unavoidable when hitting a small target size, but Shrinklyy picks the highest quality settings that still fit your chosen size, so results stay as clear as possible. Text remains sharp even at high compression levels. For minimal quality loss, choose a larger target size like 500KB or use Low compression.
Use Shrinklyy's 100KB target tool. The compression engine applies maximum image optimization and font subsetting to achieve the smallest possible file size. Text-only PDFs typically reach 100KB easily. For scanned documents, try the 200KB or 300KB targets first.
Shrinklyy is widely considered one of the best free PDF compressors because it processes files entirely in your browser, has no file uploads, no watermarks, no usage limits, and offers multiple target sizes and custom compression levels. It's fast, private, and works on any device.
You can upload PDFs up to 50 MB. Larger files may take a little longer since everything runs on your device. For best results with large files, try compressing with the 500KB target or use the custom compression tool with Medium level first.
Yes. Use the custom compression tool to choose Low, Medium, High or Maximum levels, or pick one of the fixed targets like 500 KB, 300 KB, 200 KB, or 100 KB. The custom tool gives you precise control over the quality-to-size trade-off for your specific needs.
No account, sign-up, or email address is required. Just upload a file and download the result. Shrinklyy respects your privacy by design no personal information is ever collected or stored.
Never. Your compressed PDF looks exactly like the original, only smaller. Shrinklyy does not add watermarks, stamps, promotional text, or any other markings to your documents. Your files remain completely unaltered apart from the size reduction.
Yes, image-heavy and scanned PDFs typically see the largest size reductions because images can be significantly compressed. This makes Shrinklyy ideal for compressing scanned documents, photo-heavy PDFs, and digitized files.
Shrinklyy works on the latest versions of Chrome, Edge, Firefox and Safari, on both desktop and mobile devices. The tool requires JavaScript to run the compression engine in your browser. We recommend keeping your browser updated for the best experience.
Some PDFs are already highly optimized or contain complex elements that limit how much they can be compressed further. Try using a larger target size like 500KB instead of 100KB, or use the custom compression tool with Maximum level for stronger compression.
Yes, Shrinklyy is fully mobile-friendly and works on iOS Safari and Android Chrome. The upload area, compression controls, and download button are all optimized for touch interactions. Compress PDFs from your phone just as easily as on desktop.
Yes. Since your files are processed entirely in your browser, they never leave your device. This makes Shrinklyy ideal for sensitive documents like contracts, legal papers, financial records, ID scans, and medical forms. No file data is ever transmitted over the network.
PDF compression reduces file size by optimizing internal components: images are re-encoded with efficient algorithms, embedded fonts are subset to include only used characters, and unnecessary metadata is stripped. All of this happens in your browser using client-side JavaScript no server involved.