Compress PDF Online Free
Compress PDF Online reduces the size of your PDF documents so they are easier to email, upload and store. The tool re-packages the PDF using object-stream compression and strips redundant metadata, which typically shrinks file size without altering any visible content. Everything runs locally in your browser, meaning your documents never leave your device — ideal for sensitive contracts, invoices and personal records. Note that this optimizer focuses on structural compression; PDFs that are large because of high-resolution images may see modest reductions until image-level re-compression arrives in a future update.
How to use Compress PDF
- 1
Upload your PDF
Drag your PDF file onto the dropzone or click to browse for it.
- 2
Start compression
Click Compress. The tool re-optimizes the PDF structure in your browser.
- 3
Download the optimized PDF
Compare the original and new sizes, then download the smaller file.
Why use this tool
- Reduce PDF file size for easier sharing and storage
- Strip redundant metadata for a leaner document
- Private — files are processed locally, never uploaded
- No watermark added to your document
- Free and unlimited, no account required
Frequently asked questions
- How much can I reduce my PDF size?
- Results depend on how the PDF was built. Documents with redundant objects or metadata can shrink significantly, while PDFs whose size comes mainly from large images may see smaller reductions.
- Will compression change my document visually?
- No visible content is changed — text, images and layout remain exactly the same. The optimization only affects the internal structure and metadata.
- Is my PDF uploaded to a server?
- No. The entire process runs in your browser, so sensitive documents stay on your device.
- Why isn't my PDF much smaller?
- If your PDF is large because of embedded high-resolution images, structural compression has limited effect. Image-level re-compression is planned for a future update.
- Is a watermark added?
- Never. Your optimized PDF is identical to the original, only smaller.
- Is there a file size or usage limit?
- There is no artificial limit. The only constraint is your device's memory for very large documents.
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