Free PDF Compressor
Compress PDF files online directly in your browser. Choose Standard for private structural compression or Extreme to reduce PDF file size more aggressively.
How to Compress PDF Files Online
- Upload your PDF file — Click the upload area or drag a PDF into the compressor. Your file stays on your device.
- Review the size estimate — Compare Standard and Extreme estimates so you can pick the right trade-off before processing.
- Choose a compression mode — Standard preserves quality; Extreme can reduce PDF file size more for image-heavy or scanned documents.
- Click Compress PDF — The tool processes the file entirely in your browser.
- Download the smaller PDF — Save the compressed file and open it to confirm quality before sharing or uploading.
About the Free Online PDF Compressor
ToolGenie's free PDF compressor helps you reduce PDF file size for email attachments, upload limits, document portals, and faster sharing. It is useful for resumes, forms, scanned documents, reports, and PDFs with large embedded images.
The tool runs in your browser, so your document stays on your device. Standard compression rebuilds the PDF structure, while Extreme compression re-encodes pages for a smaller output when size matters more than perfect visual fidelity.
Use Standard mode first for text-heavy documents. Use Extreme mode for image-heavy files when you need the smallest possible PDF. Pair it with PDF Splitter for very large files, PDF Merger to combine documents, or PDF to Images when you need page snapshots instead.
Frequently Asked Questions (FAQ)
How do I compress a PDF online for free?
Upload a PDF file, choose Standard or Extreme compression, click Compress PDF, and download the smaller file. No account, watermark, or software installation is required.
Is this PDF compressor private?
Yes. Compression happens locally in your browser. ToolGenie does not upload your PDF to a server or store the document.
What is the difference between Standard and Extreme compression?
Standard compression rebuilds the PDF and removes extra internal data. Extreme compression rasterizes pages and re-encodes them, which can make image-heavy PDFs much smaller.
Will compressing a PDF reduce quality?
Standard compression is designed to preserve visual quality. Extreme compression may soften text or images because it trades quality for a smaller file size.
Do I need to install software to reduce PDF file size?
No. The PDF compressor works in modern desktop and mobile browsers, so you can reduce PDF file size without installing an app, plugin, or extension.
How much can I shrink a PDF?
Savings depend on the file. Image-heavy or scanned PDFs often shrink the most with Extreme mode (commonly around 50–80%). Already optimized text PDFs may see little change in Standard mode.
Tips for Smaller PDF Files
- Try Standard mode first: Use Standard when the PDF has selectable text and you want to keep quality.
- Use Extreme for scans: Extreme mode works best for scanned PDFs or image-heavy documents that need a much smaller file.
- Check the download: Open the compressed PDF before sending important documents so you confirm the quality is acceptable.
- Split huge files first: Use PDF Splitter if your browser runs out of memory on a very large PDF, then compress each section.
- Keep an original copy: Archive the original before replacing important documents with a compressed version.