Large PDFs are hard to email, slow to upload and expensive to store. This tool reduces the size of a PDF by recompressing the images and cleaning up the file structure, and lets you choose how aggressive it should be: low compression keeps the best quality, high compression gives the smallest file, and medium sits between them. Your file never leaves your device: the work happens in your browser, with no upload and no account. It works well on scanned documents, presentations exported to PDF and image-heavy reports, and it is free with no watermark or page limit.
It depends on the content. Documents full of photos or scans usually shrink the most, while text-only PDFs are already small and change little.
Low compression keeps images close to the original. Higher levels trade some image sharpness for a smaller file, so choose the level that suits where the file will be used.
No. The compression runs locally in your browser, so the document stays on your device.
There is no fixed limit, but very large files depend on your device's memory.