Question 1

How much smaller will my PDF get?

Accepted Answer

It depends on the content. PDFs full of high-resolution photos or scanned pages often shrink by 60–90%. Mostly-text PDFs were already small and won't shrink as dramatically.

Question 2

Is my file uploaded anywhere?

Accepted Answer

No. Compression happens entirely in your browser — each page is re-rendered and re-encoded locally, and the file never touches a server.

Question 3

Will the text still be selectable after compressing?

Accepted Answer

This tool compresses by re-rendering each page as an optimized image, the same core technique most browser-based compressors use, which gives the biggest size reduction for image-heavy and scanned PDFs. That means text in the compressed file is no longer selectable. If you need to keep editable text, use a lighter compression level or convert with PDF to Word instead.

Question 4

Which compression level should I choose?

Accepted Answer

"Recommended" is the best balance for most documents. Use "Low compression" when quality matters most (e.g. printing), and "Extreme" when you need the smallest possible file, such as for an email attachment limit.

Question 5

Is there a file size limit?

Accepted Answer

There's no hard limit from this tool, but very large PDFs (hundreds of pages) take longer and use more of your device's memory, since everything runs locally in the browser.

Compress PDF

How it works

Why compress a PDF?

Frequently asked questions

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