Reduce the file size of your PDF by stripping unused objects and optimizing structure.
Large PDF files can be difficult to share via email, upload to web portals, or store efficiently. ClearUtil's PDF compressor helps you reduce file size by rewriting the internal PDF structure and stripping unused objects. Simply upload your PDF, click compress, and download the optimized version — all without any data leaving your browser.
When you edit a PDF in various applications, the file often accumulates unused objects, duplicate resources, and orphaned metadata. Our compression tool uses the pdf-lib library to parse the entire PDF document, discard unreferenced objects, and rewrite the file with a clean cross-reference table. This process is lossless — the visual content of your PDF remains identical, but the file structure is streamlined.
Because this tool runs entirely in your browser, it cannot perform server-side optimizations like re-sampling images at lower resolutions or re-compressing image streams with more aggressive algorithms. If your PDF is primarily composed of high-resolution images and you need significant size reduction, you may want to consider using a dedicated desktop tool alongside this one. For text-heavy or mixed-content PDFs, this tool often achieves meaningful size savings.
Absolutely. Unlike many online PDF compressors that upload your files to remote servers, this tool processes everything locally in your browser using JavaScript. Your PDF never leaves your computer, making it safe for confidential contracts, financial documents, medical records, and other sensitive files.
This tool accepts standard PDF files (PDF 1.0 through 2.0). Password-protected PDFs may not be compressible if they use strong encryption. For best results, remove any password protection before compressing.