Do you see my files? Is this actually private?

No, and technically it's impossible for us to. PDFCompressor processes everything inside your browser tab. Your file is loaded into your browser's memory, compressed there, and written back to your disk. Our servers are never involved in that process.

Which browsers are supported?

PDFCompressor works in all modern browsers: Chrome 89+, Firefox 89+, Safari 15.4+, and Edge 89+. It requires WebAssembly support, which all current browsers provide. Internet Explorer is not supported. If your browser is incompatible, you'll see a clear warning before anything else happens.

What's the maximum file size I can compress?

Up to 100 MB per file. This limit exists because large files require significant browser memory, typically up to 3× the input file size during processing. Most email-problem PDFs are well under 20 MB. Batch compression (multiple files at once) is on the roadmap for a future release.

How much will it actually reduce my file size?

For image-heavy PDFs (scanned documents, photo-heavy reports), expect 50–85% reduction with the Email or Web preset. For text-only PDFs with minimal images, gains are smaller. The tool shows you exact before/after sizes and percentage saved after each compression.

Is it free? What's the pricing model?

The core compression tool is free to use with no account required. We may introduce a paid plan for advanced features (larger file limits, batch processing, API access) in the future, but the single-file browser tool will remain free.

Does it work offline?

Yes, after the first compression. The engine is cached locally so every subsequent run works entirely offline even after closing and reopening the tab.

Compress PDFs Privately, Up to 85% Smaller

No signup required. Everything runs in your browser.

Drop your PDF here, or browse

Up to 100 MB

Professional PDF Compression, Zero Upload Risk

Built for professionals who can't afford to send sensitive files to someone else's server.

100% Local Processing

Your file goes from your disk to your browser's memory and back. Our servers never touch it, not even for a millisecond. Safe for legal, financial, and medical documents.

Industrial Compression Engine

Powered by a professional-grade compression engine. Real PDF rewriting, not just image re-saving, resulting in significantly smaller files that retain full fidelity.

Four Smart Presets

Choose Web, Email, Print, or Archive with one click. Or go custom: set DPI, image quality, metadata removal, and more. Full control for power users who know what they need.

Compress a PDF in Three Steps

No account. No upload. No waiting.

Upload Your PDF

Drop your file into the browser or click to browse. Up to 100 MB, no account needed.

Choose a Preset

Pick from Web, Email, Print, or Archive, or dial in custom DPI and image quality settings.

Download and Done

Your compressed PDF downloads directly to your device. Nothing was ever sent to a server.

Upload Your PDF

Drop your file into the browser or click to browse. Up to 100 MB, no account needed.

Choose a Preset

Pick from Web, Email, Print, or Archive, or dial in custom DPI and image quality settings.

Download and Done

Your compressed PDF downloads directly to your device. Nothing was ever sent to a server.

Your Files Never Leave
Your Browser

PDFCompressor processes everything entirely inside your browser tab. When you drop a file, it goes from your disk to your browser's memory, gets compressed there, and comes back to your disk. Our servers are never involved in that process. Not even for a millisecond.

Your Disk

Browser Memory (WebAssembly)

Compressed File

Legal documentsFinancial reportsMedical recordsHR filesAnything confidential

Frequently Asked Questions

Common questions about private, browser-based PDF compression.

Your Files Never Leave
Your Browser

Your Disk

Browser Memory (WebAssembly)

Compressed File

Legal documentsFinancial reportsMedical recordsHR filesAnything confidential

Compress PDFs Privately, Up to 85% Smaller

100% Local Processing

Industrial Compression Engine

Four Smart Presets

Upload Your PDF

Choose a Preset

Download and Done

Upload Your PDF

Choose a Preset

Download and Done

Your Files Never LeaveYour Browser

Do you see my files? Is this actually private?

Which browsers are supported?

What's the maximum file size I can compress?

How much will it actually reduce my file size?

Is it free? What's the pricing model?

Does it work offline?

Compress PDFs Privately, Up to 85% Smaller

100% Local Processing

Industrial Compression Engine

Four Smart Presets

Upload Your PDF

Choose a Preset

Download and Done

Upload Your PDF

Choose a Preset

Download and Done

Your Files Never LeaveYour Browser

Do you see my files? Is this actually private?

Which browsers are supported?

What's the maximum file size I can compress?

How much will it actually reduce my file size?

Is it free? What's the pricing model?

Does it work offline?

Your Files Never Leave
Your Browser

Your Files Never Leave
Your Browser