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Compress PDF

Shrink PDF file size without losing visible quality.

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How to Compress PDF Files Online

Emailing or uploading a bulky file? Compress your PDF to reduce its size while keeping it readable. You can also merge several PDFs first, or split large documents before compressing.

Compress PDF Files in 3 Easy Steps

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1Upload your PDF

Add the PDF you want to shrink by dragging it in or selecting it from your device.

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2Optimize the file

EraserPro streamlines the PDF structure to make it as small as possible without losing content.

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3Download the smaller PDF

See the before/after size, then download your optimized, lighter PDF.

Illustration of a PDF document being compressed to a smaller file size

Why use EraserPro to compress your PDF

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100% Free

Compress your PDF without paying a cent — no watermarks and no forced sign-up.

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Private & Secure

Everything runs in your browser — files are never uploaded, so your data never leaves your device.

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No Installation

Works right in your web browser — there's nothing to download or install.

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Any Device

Use it on Windows, macOS, Linux, iOS or Android — the experience is seamless everywhere.

Frequently Asked Questions

Are my files uploaded to compress them?

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No — compression happens in your browser, so your PDF stays private on your device.

Will compression reduce quality?

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It optimizes the PDF structure without degrading text or vector content. Image-heavy scans compress less.

How much smaller will my PDF be?

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It varies by file. PDFs heavy on fonts and vectors shrink the most; you will see the exact result before downloading.

Is compressing PDFs free?

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Yes, it is completely free with no watermarks or limits.