How much will my PDF shrink?

Browser-side compression is modest, it typically trims metadata and structural overhead rather than recompressing images the way server tools do. The tool shows you the honest before/after sizes, and if there's no reduction it will tell you.

Is my PDF uploaded anywhere?

No. Everything happens locally in your browser via pdf-lib. Your file never leaves your device, which makes this safe for sensitive documents.

What if the compressed file is larger than the original?

That can happen with already-optimized PDFs. The tool reports this honestly instead of claiming a saving, and you can still download the valid re-saved copy.

PDF Compressor

Shrink PDF file size in your browser

Drag & drop a PDF here, or…

Choose PDF

Maximum file size: 50 MB

How it works: your PDF is re-saved in your browser with compressed object streams. This typically trims metadata and structural overhead, the savings are modest compared to server-side tools that recompress images. Your file never leaves your device.

About this tool

Large PDF files are a hassle, they bounce back from email inboxes, eat phone storage, and take forever to upload. Our free PDF compressor tackles that without the privacy trade-off of upload-and-wait websites. You drop in a PDF up to 50 MB, and it's re-saved right in your browser with compressed object streams, trimming the structural overhead inside the file.

Here's the honest part: browser-side compression is modest. It cleans up metadata and object storage but doesn't recompress the images inside your PDF the way heavy server-side tools do. So if you need a 90% shrink on a scanned document full of photos, this isn't that tool, but you'll always see the true before/after numbers, and we'll tell you straight when a file can't get any smaller.

How to use the pdf compressor

1Choose a PDF file (up to 50 MB) or drag and drop it into the upload box.
2Click “Compress PDF”, the PDF library loads only when you start.
3Wait a moment while your file is re-saved with compressed object streams.
4Compare the before/after sizes and your savings percentage.
5Download your compressed PDF, it stays on your device the whole time.

Good to know

What you get instead is speed and privacy. No uploads means no waiting on slow connections and no sensitive document ever touching someone else's server. The PDF library only loads when you press the button, so the page stays fast, and your file never leaves your device. It's the right choice for contracts, resumes, forms, and reports where privacy matters as much as file size.