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Compress PDF Files Online

Shrink PDF size in seconds without leaving your browser.

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Compress one PDF at a time

How to Compress a PDF with IronFreeTools

  1. Upload PDF

    Choose one PDF file from your device or drag and drop it into the upload area.

  2. Choose Compression Options

    Decide whether to keep metadata and whether to refresh form appearances before generating the smaller file.

  3. Download Smaller PDF

    Your compressed PDF is ready.
    Download the optimized file and share it more easily.

Compress PDF

Go Beyond one-off PDF Compression with IronPDF for C#/.NET

Shrink PDFs inside your C# and .NET applications with IronPDF: re-encode embedded images at a chosen JPEG quality and strip structure trees from table-heavy documents.

Need PDF compression inside your own app? IronPDF lets you reduce PDF file size programmatically in C#/.NET.

Read the guide

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Frequently Asked Questions

Everything you need to know about compressing PDF files

What does Compress PDF do?

Compress PDF rewrites your document using optimized save settings to reduce file size and make the PDF easier to store, upload, and share.

Will compression affect document readability?

The tool is designed to reduce overhead in the PDF structure while preserving the document content, so normal readability should remain unchanged.

Can I keep PDF metadata?

Yes. You can choose to preserve metadata such as title, author, and subject, or remove it to help minimize file size.

What does updating field appearances mean?

If your PDF contains form fields, enabling this option refreshes how those fields are visually rendered before the output is saved.

Can I compress multiple PDFs at once?

This page currently processes one PDF at a time so you can review the compression result for each file individually.

Is my PDF uploaded to a server?

No. Compression runs locally in your browser using the IronFreeTools library.

Will this always make the file much smaller?

Not always. Results depend on how the original PDF was created. Files with extra metadata or less efficient structure usually see the biggest improvement.

Do I need to install anything?

No. You can compress PDFs directly in your browser with no installation or sign-up.

Is this free to use?

Yes. IronFreeTools offers PDF compression for free.

What are the key benefits?

Reduce PDF file size quickly Keep processing in your browser Optionally preserve metadata No account required Fast download of the optimized file Make PDFs easier to send and store.