Email Attachment PDF Compressor
Easily shrink large PDFs to under 2MB to meet standard email attachment file size limits.
Drag & drop multiple files
or browse files
Supports: .pdf
Max 20 files, 50MB each
Frequently Asked Questions
Does this tool upload my PDF to any server?
No. All PDF compression happens 100% locally in your web browser using client-side WebAssembly technologies. Your highly confidential documents (like Aadhaar, PAN, marksheets, passports, bank statements) never leave your device.
How do I compress a PDF to 1MB or 500KB?
Simply drop your PDF file, enter your desired target size in KB or MB, and click 'Compress PDF'. Our intelligent compression engine automatically scales image assets and adjusts vector structures to compress the file down to your target size while maintaining visual legibility.
Can I compress password-protected PDF files?
Because all processing occurs within your browser, we can only compress unlocked PDFs. If your PDF is encrypted or password-protected, please remove the password first before attempting compression.
What is the maximum PDF file size supported?
Since the compression runs locally using your device's hardware memory, we comfortably support PDFs up to 50MB. Larger files may be slower depending on your machine's processing power.
Does this tool work on mobile devices?
Absolutely! CompressKaro is built as a fully responsive, lightweight web application that runs beautifully on iPhones, iPads, Android devices, as well as desktop computers.