This tool reduces the file size of your PDF documents directly in your browser. No files are uploaded to any server — everything is processed locally on your device, keeping your documents completely private.
PDF compression removes redundant data and optimises the internal structure of the file. For PDFs that contain images (like scanned documents or reports with photos), compression can achieve significant reductions. Text-only PDFs are already highly efficient, so you may see less reduction on those.
Your PDF file never leaves your device. All processing is done inside your browser — nothing is uploaded, stored, or transmitted to any server.
Typical compression reduces PDF size by 20-80% depending on the content. PDFs with high-resolution images compress the most. PDFs that are mostly text may compress by only 10-20%. PDFs that are already well-compressed may show little reduction.
Compressing a PDF can slightly reduce image quality within the PDF, depending on the compression level chosen. Text and vector graphics are generally not affected by compression. For documents with important photos, use a moderate compression setting to balance size and quality.
Yes. This PDF compressor runs entirely in your browser. Your files are never uploaded to any external server and never leave your device. All processing is done locally using JavaScript PDF libraries.
PDFs are often large because they contain high-resolution embedded images, embedded fonts, or both. Scanned document PDFs are particularly large because each page is essentially an image. Compressing these images within the PDF is the most effective way to reduce file size.
This browser-based compressor can handle most standard PDFs. Very large files (100 MB+) may be slow due to browser memory limitations. For very large PDFs, a desktop application like Adobe Acrobat or a command-line tool (Ghostscript) may be more suitable.