Compress PDF

Reduce your PDF file size online. Image-heavy PDFs shrink the most, while your t...

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Quick answer

A PDF compressor reduces a PDF's file size so it is easier to email, upload, or store. YaliKit's tool works best on image-heavy PDFs, re-optimizing the photos and scans inside while keeping your text selectable and your links clickable. Files are compressed on our server over an encrypted connection, then deleted right after, with no signup and no watermark.

SSL Secured
256-bit Encryption
Cloud Processing
Mobile Friendly

Why It Is Better

Real compression, honest results, secure by default

Image-Aware Compression - Biggest wins on photos and scans
Keeps Text Selectable - No flatten-to-image trick
Secure Server Processing - Encrypted, then deleted
Exact Bytes Saved - Real before and after sizes
No Watermark - Clean output, always
Free and Unlimited - No signup, no cap

Why Use Compress PDF?

Built for Image-Heavy PDFs

The biggest wins come from PDFs full of photos, scans, and screenshots. Our server re-optimizes those images so the file drops in size while the pages still look right. Text-only PDFs are already compact, so they shrink far less, and that is completely normal.

Your Text Stays Real Text

This is not a flatten-to-image trick. After compressing, your text is still selectable, searchable, and copyable, and your links stay clickable. The document reads exactly the way it did before, just lighter.

Processed, Then Deleted

Your PDF is sent over an encrypted connection, compressed on our server, and streamed straight back to you. It is not kept, logged, or shared. Nothing sits on a drive waiting to be found later.

Honest Results, No Fake Numbers

We show you the real before and after sizes and the exact bytes saved. If a PDF is already well optimized and cannot get smaller, we tell you plainly and still give you the file instead of pretending it shrank.

When to Compress a PDF

Common moments where a smaller PDF helps

Email Attachments

Get a heavy PDF under Gmail or Outlook attachment limits so it actually sends instead of bouncing.

Upload Forms With Size Caps

Job applications, government portals, and school submissions often cap the file size. Shrink your PDF to fit the limit.

Cloud Storage

Store more documents in Drive, Dropbox, or OneDrive by keeping each PDF smaller and lighter.

Faster Web Downloads

Offer smaller PDFs on your site so visitors, especially on mobile, get them quickly without a long wait.

How It Works

1

Upload Your PDF

Drag a PDF onto the box or click to pick one from your device. You will see the file name and its current size right away.

2

Compress

Press Compress PDF. The file goes to our server, gets optimized in a few seconds, and comes straight back. Nothing is stored.

3

Download and Compare

See the original size, the new size, and the exact percent saved. Download your smaller PDF with one click. No watermark, no signup.

Pro Tips

Image-Heavy PDFs Shrink Most

If your PDF is full of photos, scans, or screenshots, expect a real drop in size. A page of plain text is already tiny, so those files move very little. Both outcomes are normal.

Barely Changed? That Is Fine

A small reduction means the PDF was already well optimized. There is nothing wrong with the file or the tool. You still get a valid, ready-to-use PDF back.

Scanned Documents

Scans are really images, so they usually compress well here. If you also do not need color, running the file through our Grayscale PDF tool first can shrink it even further.

Frequently Asked Questions

It depends entirely on what is inside. PDFs packed with photos, scans, or screenshots often shrink a lot because those images can be re-optimized. Text-only PDFs are already compact and may barely change. We do not promise a fixed percentage because an honest number depends on your file, and you will see the real result the moment it finishes.
That usually means it was already well optimized, or it is mostly text and fonts with very few images. There is simply little left to remove. When this happens we say so directly and still hand back the file, unchanged in quality.
Text, fonts, and vector graphics stay crisp and selectable. For image-heavy pages, photos may be re-encoded to save space, which can be slightly softer at very high zoom, but for reading, printing, and sharing the difference is hard to notice. If a file cannot shrink without harming it, it stays effectively the same.
Yes. Your PDF is uploaded over an encrypted connection, compressed on our server, and returned to you immediately. It is not saved, shared, or used for anything else. Once your download is ready, the working copy is gone.
The tool works best with PDFs up to about 50MB. Larger files still work but take longer and, if a file is very large, the request can time out. If that happens, try splitting the PDF first and compressing each part.
Not directly. A protected PDF has to be unlocked first. Use our Unlock PDF tool with your password to remove the restriction, then run the unlocked file through this compressor.
Yes. You can compress as many PDFs as you want for free, with no account, no email, and no watermark added to the output. If the server is momentarily busy you will see a short countdown, then you can try again at no cost.

Related Tools

Split PDF

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Merge PDF

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PDF to Word

Convert a PDF to editable Word

Grayscale PDF

Drop color to shrink size further