Compress PDF Online
Reduce your PDF file size without annoying watermarks. Choose your compression level, upload your file and download a lighter, optimized PDF in seconds.
Free Online PDF Compressor – Reduce File Size in Seconds
Large PDF files are hard to email, slow to upload and annoying to share. The free PDF compressor from ConvertFree.net helps you shrink your documents without installing any software. Just upload your file, choose a compression level and download a lighter, optimized PDF that still looks great on screen and on paper.
Our compressor runs entirely on our own servers using the Imagick engine. We don’t send your files to external services or third-party APIs. Instead, we re-render each page of your PDF at an optimized resolution and adjust image compression to reduce the file size. The Balanced preset is ideal for everyday sharing, while the Strong compression preset gives the smallest files for email attachments and uploads with strict limits. If you need maximum clarity for printing, you can use the High quality preset.
You can use this tool on reports, slide decks, e-books, invoices, contracts and more. For files that contain lots of images, compression can often reduce the size by over 50% with only a minimal change in visual quality. If your PDF is already heavily optimized, the size change may be smaller – in those cases we still give you clear before/after statistics so you can decide what to keep.
If you need to change the structure of your PDF before or after compression, you can use our Merge PDF tool to combine multiple documents and Split PDF to extract specific sections or pages. When you want to convert PDFs into images instead of compressing them, our PDF to JPG and PDF to PNG tools are ready as well. You can even go full circle by converting images back into documents using PNG to PDF or JPG to PDF.
ConvertFree.net focuses on fast, clutter-free tools that respect both your time and your privacy. There is no watermark, no forced registration and no tricks – just a clean PDF compressor with clear controls, drag-and-drop upload and mobile-friendly design so you can optimize your files from any device.
Compress PDF – Frequently Asked Questions
How does the ConvertFree.net PDF compressor work?
Our PDF compressor re-renders your document using the Imagick engine, adjusting resolution and image compression to reduce file size. It keeps the visual layout of your PDF while shrinking large images and optimizing content so your file becomes easier to share and store.
Will compressing my PDF reduce the quality?
Compression always involves a trade-off between size and quality, but our presets are tuned to give practical results. The Balanced preset is ideal for everyday use, while the Strong compression preset produces smaller files with a more visible quality drop. For presentations or printing, choose High quality for a gentler reduction.
What is the maximum PDF file size I can upload?
The current limit is 80 MB per file. This keeps the compressor fast and stable, even on shared hosting, while still supporting most real-world documents such as slide decks, reports and e-books. If your file is larger than 80 MB, try splitting it first with our Split PDF tool.
Why is my compressed PDF not much smaller than the original?
Some PDFs are already heavily optimized or contain mostly text and vector graphics that don’t compress much further with image-based methods. In those cases, the size savings may be modest, and the tool will report that the size is similar or unchanged. You can still try a stronger preset or remove unnecessary pages with Split PDF.
Are my PDF files safe and deleted automatically?
Yes. Your files are processed only on ConvertFree.net servers and are never sent to external conversion APIs. We also run an automated cleanup job that regularly removes old files from our storage folders, so your documents are not kept longer than necessary.