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PDF Compressor

Reduce PDF file size — right in your browser. Choose a compression level, optionally strip metadata and clean up the file structure, then download the smaller PDF. Everything runs locally, so your PDF never leaves your device.

Upload PDF

Select a PDF file to compress

Drop a PDF file here or click to browse

Supports PDF files only. Choose file

Tip: Everything runs in your browser using pdf-lib. Your PDF never leaves your device — no upload, no server, no tracking.

Compression Result

Ready to compress

Your compressed PDF will appear here

Upload a PDF, choose a level, and click Compress PDF & Download.

What does this PDF Compressor do?

This free online PDF compressor reduces the file size of any PDF — entirely in your browser. It works by optimizing the internal structure of the PDF: enabling object streams, removing redundant metadata, and cleaning up unused references. Everything is done with pdf-lib, a fast open-source JavaScript library that reads and writes PDF files directly.

Unlike compressors that upload your file to a server, this tool never sends your PDF anywhere. It works locally on your device, which means your documents stay completely private. You can compress contracts, invoices, reports, scanned pages, or any other PDF without worrying about who sees it.

Results vary depending on the PDF. Text-heavy documents often compress 10–30%. PDFs with large embedded images may compress more. Some PDFs that are already well-optimized may not shrink at all — that's normal and expected. The tool always shows you the before-and-after size so you can decide whether the compressed version is worth keeping.

How to compress a PDF

  1. Upload your PDF: Drag and drop a PDF file into the upload zone, or click to browse your device.
  2. Choose a compression level: Light is fast and safe. Medium is the recommended all-rounder. Strong applies maximum compression.
  3. Optional settings: Toggle Strip metadata to remove title, author, and other document info. Toggle Use object streams for better compression on large PDFs.
  4. Click Compress PDF & Download: The tool loads the PDF, applies the optimizations, and prepares a smaller file for download.
  5. Download: The compressed PDF downloads automatically. You can also click Download Compressed PDF in the result panel.

Why use this PDF Compressor?

100% private

Everything runs in your browser. Your PDF never leaves your device — no upload, no server, no logs, no tracking.

Three levels

Choose Light, Medium, or Strong compression. Each level applies different optimization settings.

Optional metadata strip

Remove title, author, keywords, and other document metadata to shrink the file further.

Fast processing

No queue, no waiting. PDFs are optimized locally using pdf-lib — usually in under a second.

Works on mobile

Fully responsive. Compress PDFs from a phone, tablet, or desktop — no app install required.

No watermark

Your compressed PDF is clean — no watermarks, no branding, no limitations. Use it for personal or commercial projects.

When would you need to compress a PDF?

  • Email attachments: Many email providers limit attachment size. Compress a PDF so it fits under the cap.
  • Form submissions: Portals often reject PDFs over a certain size. Compress first so your upload goes through.
  • Cloud storage: Save space by shrinking large PDFs before uploading them to Drive, Dropbox, or OneDrive.
  • Web uploads: Keep your website or CMS under its file-size limits by compressing PDFs before publishing.
  • Scanned documents: Scans are often bulky. Compression strips redundant data and shrinks the file.
  • Archiving: Store more documents in the same amount of space by compressing them first.

Frequently asked questions

Yes, completely free. No signup, no watermark, no hidden charges. Compress as many PDFs as you want, for personal or commercial use.
No. Everything runs in your browser using JavaScript and the pdf-lib library. Your PDF files never leave your device — there is no server processing, no logging, and no data storage. Close the tab and it's gone.
Results vary. Text-heavy PDFs often compress 10–30%. PDFs with embedded images may compress more. Some PDFs that are already optimized may not shrink at all. The tool always shows you the before-and-after size so you can decide.
Light (fast, safe, keeps metadata), Medium (recommended — strips metadata, optimizes structure), and Strong (maximum compression — strips metadata and aggressively restructures).
Encrypted PDFs cannot be compressed. The tool will show an error if it can't read the file. Unlock it first (for example with our PDF Unlock tool) and try again.
Yes. Once the page loads, the compressor works without an internet connection. All processing happens locally in your browser.
No. This tool optimizes the PDF structure and removes unnecessary data. It does not re-encode images or text, so the visible content and quality stay exactly the same.