← ToolsStackPDF Compressor

PDF Compressor

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Drag & drop PDF here, or click to select

Max 50MB — all processing happens in your browser

Frequently Asked Questions

How does the PDF Compressor work?

Select a PDF file, and the tool processes it entirely in your browser using the pdf-lib library. It analyzes the PDF structure, optimizes embedded images and fonts, removes redundant data, and produces a smaller output file. The compression level is configurable.

Does compression reduce PDF quality?

The tool uses lossless compression where possible. Text and vector graphics are fully preserved. Embedded images may be re-compressed depending on your quality settings, but you can choose a higher quality setting to minimize visible differences.

Is my PDF document secure during compression?

Yes. Unlike most PDF compression websites that require uploading your file to a server, ToolsStack processes your PDF entirely in your browser. Your document never leaves your device. This is essential for confidential or sensitive documents.