Will compressing make the text blurry?

No. Text is not an image — it is stored as characters and font data, and Docqify never touches it. Only photographs are re-encoded, so text and vector graphics stay exactly as sharp as they were, at any zoom level.

How small can a PDF get?

It depends entirely on what is inside. A scanned document that is mostly photographs can often lose 80 to 95 percent of its size. A PDF that is mostly text may barely change, because there was nothing heavy in it to begin with — and Docqify will tell you that rather than pretending otherwise.

Can I compress to an exact file size?

You can set a maximum. Choose a target such as 2 MB or 200 KB and quality is reduced step by step only until the file fits, so you keep as much quality as the limit allows. If the target cannot be reached without destroying the document, you get the smallest sensible version and a clear note saying so.

Are my files uploaded to a server?

No. Compression runs in your browser using your own processor and graphics engine, and there is no backend to send anything to. The page is served with a Content Security Policy containing connect-src self, which makes it structurally incapable of opening a connection to another origin — visible in the response headers if you want to check rather than trust.

Why did my PDF barely get smaller?

Almost certainly because it is mostly text, vector drawings, or images stored in a format Docqify deliberately leaves alone. Those are already compact, and re-encoding them would cost visible quality for a saving measured in kilobytes. The result panel says how many images were changed and how many were skipped.

Compress PDF to the size you need

Make a PDF small enough to send. Your file never leaves this device.

Nothing is uploaded
Works offline

Drop your PDF here

Shrink it to a size you choose, or pick a quality level. The file is opened on this device and never uploaded.

The photographs, and nothing else

Nearly all of a large PDF is usually a handful of photographs, so that is what gets compressed. Docqify finds the images inside the document, redraws them smaller using your browser’s own graphics engine, and writes them back — leaving the text, fonts and vector drawings completely untouched. That is why a compressed file still has selectable text and crisp lines at any zoom, and why a document made only of text barely shrinks at all: there was never anything heavy in it to remove.

Give it a size to hit — 10 MB for an email, 200 KB for a strict upload form — and quality is lowered only as far as it takes to get there, never further.
A file that already meets your target is returned exactly as it was, rather than re-encoded for no reason.
Photographs stored as JPEG are re-encoded. Logos and line art stored in other formats are left alone, because re-encoding those costs quality and saves almost nothing. The tool tells you which it did.
Everything runs on your device. The page ships a Content Security Policy that blocks connections to any other origin, so a document you compress here cannot be sent anywhere.

Questions

Compress PDF — the details

PDF tools

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The same guarantee applies to every one of these: the file is opened by your browser, worked on there, and never sent anywhere.