Shrink PDF file size with structure optimization or image re-encoding, privately in your browser.
PDF Compress reduces file size using two approaches. Structure optimization re-saves the document with compressed object streams, preserving all content. Image re-encoding renders pages to JPG at a lower quality for stronger reduction.
Structure optimization is lossless and best for text-heavy documents. Balanced re-renders pages to JPG at 1.5× with 80% quality. Strong uses 1× scale with 60% quality for the smallest output.
PDF parsing, canvas rendering, image encoding, and saving all happen on your device. ToolNest does not receive or retain the document.
Current Chrome, Edge, Firefox, and Safari support the required PDF worker, canvas, Blob, and download features. Complex or unusually large PDFs may need a desktop browser with more available memory.
No. ToolNest reads the PDF, applies compression, and saves the result locally in your browser. The document never leaves your device.
Structure optimization re-saves the PDF with compressed object streams without re-encoding images, so text and vector graphics stay lossless. Balanced and Strong re-render pages to JPG at lower quality, which produces smaller files but converts vector text and graphics to images.
Start with Structure optimization for text-heavy PDFs. Use Balanced for scanned documents or image-heavy PDFs. Use Strong only when you need the smallest file and can accept lower image quality.
Structure optimization preserves all content exactly. Balanced and Strong re-render pages to JPG, which reduces image quality. Choose the lowest level that achieves your target file size.
No. Unlock encrypted or password-protected PDFs in an appropriate application before using this browser tool.
Re-rendering pages to images is memory-intensive. The 100-page limit protects your browser from running out of memory. Use Structure optimization for larger PDFs.