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Compress PDF
Optimize images and shrink PDF document file sizes locally inside your browser.
100% Offline & Private
Select PDF document
Drag & drop or select a PDF file to compress
Document Selected
document.pdf (0 KB)
Ready to Compress
Select your compression ratio on the right and click "Start Compression".
Original Size
0 KB
Compressed
0 KB
Saved 0% of original file size!
Compression Settings
65%
Lower quality leads to smaller file sizes but may introduce pixelation on embedded images.
Compressing page 1...
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Frequently Asked Questions
Quick direct-answer guides about using this utility tool locally and securely.
How much can this tool reduce my PDF file size?
Most PDFs compress by 60–80% depending on how many images they contain. A 10MB PDF typically reduces to under 3MB, while text-heavy documents with fewer images see smaller reductions. You can preview the compressed size before downloading.
Will my PDF look the same after compression?
Visually yes — text, layout, and images all look the same on screen and in print. However, since compression optimizes pages as images for maximum size reduction, the text becomes non-selectable in the output. Keep a backup of the original if you need to copy text later.
What compression settings give the best balance of quality and file size?
For most office documents and reports, set Resolution to 1.2x and Image Quality to 60–70%. This reduces file size by 70%+ while keeping text crisp and diagrams readable — ideal for emailing or uploading documents with size limits.
Is it safe to compress confidential PDFs?
Yes — your PDF never leaves your device. Compression runs entirely in your browser memory. No server upload happens at any stage.
Is there a file size limit?
No server limit exists since there's no upload. Processing depends on your device RAM — files up to 100-150MB work smoothly on most computers.
How does KuberAgent compare to iLovePDF for compression?
KuberAgent compresses PDFs entirely in your browser with no file size limits, no daily caps, and no server uploads — iLovePDF uploads your files to their servers and has a 100MB limit on free plan. For privacy-sensitive documents, KuberAgent is the better choice.
How do I compress a PDF to under 1MB for email or upload?
Set image quality to 50–60% and resolution to 1x for maximum compression. Most standard documents will compress well under 1MB, making them suitable for email attachments and online form uploads with strict size limits.
Can I compress a PDF on my phone without an app?
Yes — open KuberAgent PDF Compressor in any mobile browser, upload your file, adjust the compression settings, and download the reduced file directly to your phone. No app installation needed.
Why is my PDF so large even though it has only a few pages?
Large PDFs usually contain high-resolution embedded images or unoptimized scans. Even a 2-page PDF can be 20MB+ if it was scanned at 300DPI. Compressing it reduces those embedded images to web-friendly sizes without changing how the document looks.
Is KuberAgent PDF compressor better than Smallpdf or Adobe Acrobat online?
Smallpdf and Adobe online both upload your files to their servers and have daily free limits. KuberAgent compresses entirely in your browser with no uploads, no daily cap, and no subscription — making it faster, more private, and completely free.