PDF Compressor

Reduce the size of your PDF files without losing quality.

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How to Compress PDF Files

Reduce your PDF file size significantly while preserving quality — all processing happens locally in your browser for maximum privacy and speed.

1

Upload Your PDF

Drag and drop your PDF file into the upload zone or click to browse your device. The tool accepts documents of any size up to your browser's memory limit.

2

Choose Compression Level

Select your preferred compression intensity: Low (minimal size reduction), Medium (balanced quality/size), or High (maximum file size reduction).

3

Start Compression

Click the compress button to begin the optimization process. The tool intelligently analyzes and reduces file size while maintaining visual integrity.

4

Download Optimized PDF

Save your compressed PDF instantly. The tool shows the size reduction percentage so you can see exactly how much space you've saved.

🔒 100% Private & Secure

Your PDF never leaves your device. All compression happens locally using WebAssembly and JavaScript — zero uploads to servers, zero temporary storage, zero tracking. Perfect for confidential documents.

Advanced PDF Compression Features

Smart Image Optimization

Automatically recompress images within your PDF using intelligent algorithms that reduce size while preserving visual quality and clarity.

Font Subsetting

Remove unused font characters and embed only the glyphs actually used in your document, significantly reducing file size without affecting readability.

Metadata & Object Cleanup

Remove redundant metadata, duplicate objects, and unused structural elements that bloat your PDF file without adding any value.

Real-Time Size Preview

See your PDF's original size, estimated compressed size, and compression ratio before you commit. Make informed decisions about which compression level to use.

Batch Processing Ready

While the tool is optimized for single files, the compression engine can handle multiple files sequentially without degradation — perfect for office workflows and document management.

Frequently Asked Questions

1 Will compression affect the quality of my PDF?
With Low or Medium compression, quality loss is nearly imperceptible. High compression may slightly reduce image quality and font rendering, but text remains crisp and readable. The tool balances size reduction with visual fidelity automatically.
2 What's the maximum file size I can compress?
Since all processing happens locally, the limit depends on your device's available memory (RAM). Most modern browsers can handle PDFs up to 500MB comfortably. The tool efficiently streams and processes data without loading the entire file into memory at once.
3 Can I compress scanned PDFs or those with images?
Absolutely! The tool excels at compressing image-heavy PDFs. It intelligently recompresses images, optimizes color spaces, and removes unnecessary data from scanned documents, often achieving 50-70% size reduction while maintaining legibility.
4 Is my document stored anywhere after compression?
No. Your document is processed entirely in your browser's memory and is never uploaded to any server. Once you close the tab or refresh the page, all data is permanently erased. We don't store, cache, or log any of your documents.
5 Will compression break digital signatures or forms?
The tool preserves form fields, annotations, and most interactive elements. However, digital signatures may be invalidated if the document content changes (which is standard for any PDF modification). We recommend removing signatures before compression and re-signing afterward if needed.