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PDF Size Reducer

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Reduce PDF file size locally in your browser. Strips redundant objects with pdf-lib.

Image Quality 75%

Smaller fileBetter quality

⚠️ Text searchability is lost: pages are re-rendered as images. Best for scanned PDFs.

Click or drag your PDF here

PDF · Up to 10 files · Zero uploads

Selected PDFs 0

Total: 0 KB

Processing your file...

Ready to compress

Your compressed PDF will appear here once you click Compress PDF. Processing happens entirely in your browser, nothing is uploaded.

Smart: lossless Deep: up to 80% smaller 100% private

Processing… 0%

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Your PDF is ready to download.

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Compressed

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What is the PDF Size Reducer?

The PDF Size Reducer is a free online tool designed to shrink large PDF documents by re-serialising the file structure and removing redundant objects. It's perfect for when you need to send a PDF via email but the file size exceeds attachment limits.

How to reduce PDF file size?

Upload PDF: Click the upload area or drag and drop your large PDF document into the designated dropzone.

Select Mode: Choose between 'Smart' mode for lossless compression that keeps text searchable, or 'Deep Compress' for maximum file size reduction.

Compress & Save: Click Compress PDF. The tool will process your file locally and show you exactly how much space you saved before downloading.

Why is it 100% Private?

Your documents are entirely safe. Unlike many other PDF tools, we never upload your sensitive PDF files to external servers. The entire compression process uses pdf-lib to run locally inside your browser, ensuring complete data privacy.

Frequently Asked Questions

How can I reduce PDF size to 100KB for free?

Upload your document to our PDF Size Reducer. The tool will automatically strip redundant metadata and re-serialise the PDF structure. Depending on the original file, it can compress large PDFs down to 100KB or 200KB instantly.

Does compressing a PDF reduce its quality?

Our tool performs 'lossless' structural compression using pdf-lib. It removes hidden, duplicate, or redundant data streams without degrading text or image quality.

Is it safe to compress confidential PDFs here?

Yes, it is 100% safe. Unlike cloud-based converters, this tool runs entirely on your local machine. Your confidential documents are never uploaded to any server.