Compress PDF Online — Free, Fast & 100% Private
Shrink large PDF files — especially scanned documents and image-heavy reports — right inside your browser. Choose a compression level and download a smaller file instantly, with nothing ever uploaded to a server.
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Why use our PDF Compressor
Free, private and fast — everything runs in your browser, so your files and text stay on your own device.
How to use PDF Compressor
PDF Compressor — complete guide
PDFs usually balloon in size because of unoptimized images — a scanned document saved at a very high DPI, or photos embedded at full camera resolution, add up fast across many pages. Compression works by re-encoding each page's image content at a lower, still-readable quality, which is why image-heavy and scanned PDFs shrink the most, while mostly-text PDFs (already small and vector-based) may barely shrink at all.
A detail worth knowing: good compression should only change image quality, never the PDF's actual page size. Every page keeps its original width and height exactly — including portrait and landscape pages mixed within the very same document — so your content never gets stretched, cropped, or distorted after compressing.
If you're preparing a document for email (many providers cap attachments around 20-25MB), compression is often the fastest fix. Combine this with Merge PDF to join several documents into one file first, or Split PDF to send only the pages that matter. If you started from photos rather than an existing PDF, JPG to PDF lets you build the PDF and compress it in one workflow.
Frequently asked questions
Is this PDF compressor free?
Yes, with no sign-up, no watermark, and no limit on how many files you compress.
Will every PDF get smaller?
Image-heavy and scanned PDFs usually shrink significantly. PDFs that are already mostly text or previously optimized may see limited savings.
Is my file uploaded to a server?
No. Compression runs entirely in your browser — your PDF stays on your device throughout.
Which compression level should I choose?
Start with Balanced for most documents. Use Strong for scans you only need to read on screen, and Light when print quality matters most.
Will strong compression make text blurry?
Compression affects image content; the visible sharpness mainly matters for scanned pages, since real text in a text-based PDF isn't rasterized.
Does this work correctly if my PDF mixes portrait and landscape pages?
Yes. Each page keeps its own original dimensions and orientation — mixed-page documents compress safely without resizing or cropping any page.
Can I compress a password-protected PDF?
Password-protected PDFs may not open correctly in the browser. Remove the password first, then compress.