Shrink a PDF's file size by rebuilding its internal structure and removing redundant overhead — free, in your browser, with no quality loss.
One file in, one smaller file out.
Drop in the file you want to shrink
Internal structure is optimized automatically — nothing to configure
Get your smaller PDF, same visual quality
Being straightforward about this matters more than a big marketing number: FileSeb's Compress PDF tool rebuilds your file's internal structure — cleaning up redundant objects and reorganizing how the file is stored — rather than recompressing or downscaling the images inside it. That means it's completely safe for text-heavy documents, contracts, and reports, with zero visual quality loss, but the size reduction will be modest on a PDF that's large mainly because of high-resolution embedded photos.
If your PDF is a scan or photo-heavy document and you need a much smaller file, your best result usually comes from lowering image resolution before it becomes a PDF in the first place — for example, using the Image Compressor on your source photos, or the PDF Scanner tool, before converting.
It depends on the file. This tool rebuilds the PDF's internal structure and removes redundant overhead, which typically gives a modest, reliable reduction. It does not recompress or downscale embedded images, so a PDF that's large mainly because of high-resolution images won't shrink dramatically.
No. This tool only optimizes the file's internal structure — it doesn't re-encode or downsample images, so visual quality is unaffected.
Yes, it's safe to run, but because scanned PDFs are usually large due to embedded photo-like page images rather than file overhead, the size reduction will likely be smaller than on a text-heavy PDF.
No. Compression happens entirely inside your browser using JavaScript. Your PDF is never sent to a server.
→ Read the full guide: How to Reduce a PDF's File Size (every method explained)
