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Compress PDF

Reduce the file size of your PDF without losing quality. Client-side compression removes redundant data and optimises images — no upload required.

  • 100% free
  • No signup
  • Runs in your browser
Common uses: compress pdf · reduce pdf size · pdf compressor · shrink pdf · pdf file size reducer

Used 34.6K times today

Maximum compressionNo compression
High (Recommended)
Minor compression, near-original quality

How to Use Compress PDF

  1. 1

    Upload your PDF

    Drag and drop or click to upload the PDF you want to compress. The file stays in your browser — no server upload occurs.

  2. 2

    Choose compression level

    Select Low, Medium, or High compression. Higher compression reduces file size more aggressively but may slightly reduce image quality.

  3. 3

    Download the compressed PDF

    Click Compress and then download the output. The tool shows you the before and after file size so you can see exactly how much space was saved.

Frequently Asked Questions

How much can I expect to reduce my PDF size?
Results vary depending on PDF content. PDFs with many high-resolution images typically see 40-70% reduction. Text-heavy PDFs with already-compressed images may see less than 20% reduction.
Will compression affect text readability?
No. Text, vector graphics, and fonts are not affected by compression — only embedded raster images are resampled to reduce file size.
My PDF is already small — why is there no reduction?
If a PDF was already compressed or contains mostly text and vector content, there is little redundant data to remove. The tool will still produce a valid optimised output.

Embed This Tool

Add this tool to your website for free. Just copy and paste the code below:

<iframe src="https://utilko.com/embed/compress-pdf/" width="100%" height="500" frameborder="0" title="Compress PDF"></iframe>

About Compress PDF

The Compress PDF tool on Utilko reduces PDF file sizes by stripping redundant metadata, optimising image streams, and removing unused objects — all within your browser using client-side JavaScript. Email attachments, form uploads, and document portals often impose file-size limits, and this tool helps you meet those constraints without sacrificing content.

Three compression levels give you control over the quality-size trade-off: Low compression prioritises visual fidelity, while High compression maximises size reduction for scenarios where the smallest possible file is the priority, such as archiving or mobile viewing.

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