Modern PDFs (version 1.5 and later) can pack their internal objects into compressed 'object streams', but many files — especially ones assembled by older tools or exported with editing metadata — carry dead weight: orphaned objects, thumbnails, author metadata, embedded edit histories. This tool reloads your PDF and re-serializes it cleanly: metadata stripped, objects repacked into streams. One honest caveat up front: it does not re-encode the images inside the PDF, so a scan that's mostly photos won't shrink much — expect the biggest wins on files bloated by metadata and poor packing.
Drop your file here or click to browse
.pdf — up to 200 MB. Processed locally; never uploaded.
How to compress a PDF
Drop your PDF onto the box above, or click to browse.
The %PDF header is verified, and the file size is checked against the 200 MB cap.
Click Compress. The document is parsed and re-written with object streams on your device.
The result shows the before and after sizes so you can see exactly what was saved.
Download the compressed file — or keep the original if the savings weren't worth it.
Frequently asked questions
How much smaller will my PDF get?
It depends entirely on what's inside. Files bloated by metadata, embedded thumbnails, or sloppy export tools can shrink 20% or more. A PDF that's mostly already-compressed images may shrink less than 10% — the tool shows you the real number before you download.
Why can't it compress my scanned document?
A scan is a stack of photos, and photos inside a PDF are already compressed images. Shrinking them further requires re-encoding the images at lower resolution or quality, which this lossless tool deliberately doesn't do — it never degrades your document.
Does compressing remove anything I care about?
It strips document metadata (title, author, producer, creation dates) and dead objects — many people consider that a privacy bonus. Page content, text, and images are untouched.
Is it safe for confidential documents?
Yes — arguably safer than any server-based compressor, because the document never leaves your machine. Nothing is transmitted, logged, or stored anywhere but your own disk.