Compress PDF Online

Optimize a PDF file in your browser by rebuilding the document, cleaning metadata and reducing structural overhead.

Basic PDF optimizer

This browser tool performs safe basic optimization. It may not strongly compress image-heavy scanned PDFs. For powerful image compression, a backend compressor can be added later.

Select PDF File

Drop one PDF file here or click below to choose a PDF from your device

Compression Settings

Compression Mode Safe optimization is recommended for live use.

Metadata

Download Name

If Larger Than Original

0 Pages

0 KB Original Size

0 KB Output Size

0 KB Saved

0% Reduction

Selected PDF

PDF

No PDF selected yet Upload one PDF file to start compression.

Compression Result

No compression result yet.

Compression Report

File Details

About This Tool

Compress PDF is a free online PDF optimization tool that helps reduce or optimize PDF file size directly in your browser.

You can upload one PDF file, choose a compression mode, remove basic metadata, rebuild the PDF structure and download the optimized result. The tool shows original size, output size, saved size, reduction percentage, page count and a compression report.

This browser-based tool is best for safe basic PDF optimization. It may reduce some PDFs, especially files with removable metadata or structural overhead. Image-heavy scanned PDFs may need stronger backend image recompression for major size reduction.

This tool is useful for students, offices, businesses, teachers, churches, organizations and anyone who needs to prepare smaller PDF files for email, upload forms, websites or document sharing.

How to Use Compress PDF

1. Upload or drag and drop one PDF file.
2. Choose a compression mode. Safe optimization is recommended.
3. Choose whether to remove basic metadata.
4. Click Compress PDF.
5. Review the original size, output size, saved size and reduction percentage.
6. Open the preview to check the result.
7. Click Download PDF to save the compressed or optimized PDF.

Privacy Note: This Compress PDF tool runs directly in your browser using JavaScript. Your PDF file is processed on the page and is not submitted through a form by this tool.

Frequently Asked Questions

Is this Compress PDF tool free?

Yes. This Compress PDF tool is free to use and does not require signup.

Does this tool upload my PDF to the server?

No. The PDF optimization runs directly in your browser using JavaScript and the page does not submit your PDF through a form.

Why did my PDF size not reduce much?

This browser-based tool performs basic safe optimization. If your PDF is mostly scanned images, strong compression usually requires image recompression through a backend compressor.

Can it compress scanned PDFs?

It can try to optimize the PDF structure, but scanned PDFs are usually image-heavy and may need advanced image compression for large size reduction.

Can it compress password-protected PDFs?

Password-protected or encrypted PDF files may not work in this browser-based tool. Use PDF files that you own and can open normally.