PDF Compress Tool
Compress PDF files online — free & instant
Reduce your PDF file size without losing readability. Adjust quality and resolution. All processing happens in your browser — zero uploads, 100% private.
Lower quality = smaller file size. Preview updates live.
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Upload a PDF to compress. Lower quality = smaller file size. Scale reduces page resolution before re-packaging.
Processed Images
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FAQ
Frequently asked questions
Our tool uses pdf.js to render each page locally in your browser, then repackages the pages into a new PDF using jsPDF. The entire process runs on your device — your PDF never leaves your computer.
You can control this with the Quality and Scale sliders. Lower quality reduces image fidelity within the PDF but produces smaller files. The Scale slider reduces page resolution before repackaging, which also helps reduce file size. Find the right balance for your needs.
Our tool automatically checks the output size. If the compressed version ends up larger than the original (which can happen with already-optimized PDFs), it keeps your original file unchanged.