PDF Compressor

Reduce the file size of your PDFs while maintaining quality.

How to Use PDF Compressor

  1. Upload the PDF you want to make smaller.
  2. Set the quality slider. Lower means a smaller file and softer-looking pages; around 70% is a good place to start.
  3. Click Compress PDF and compare the original with the compressed preview and its new size.
  4. If it looks right, download it. If not, move the slider and press Re-Compress.

How this compressor works, and the trade-off

Each page is drawn as an image and saved as a JPEG at the quality you choose, then the images are put back together as a new PDF. All of it happens in your browser, so the document is never uploaded.

The catch: because every page becomes a picture, text in the compressed file can't be selected or searched any more, and links stop working. That's a good deal for scans, photographed documents and image-heavy files, which is where big PDFs usually come from. For a text-only PDF such as a typed report, this method can make the file bigger instead, and the tool warns you when that happens.

Getting under an upload limit

Email attachments usually top out at 20 to 25 MB, and plenty of government, university and job portals want files under 1 or 2 MB. Start around 70%, check the new size, and lower the slider a step at a time until it fits. Below roughly 40% small print starts to blur, so zoom into the preview before sending anything important.

If you can't get it small enough and still readable, split the PDF into parts with the PDF Splitter, or take out pages you don't need with Remove PDF Pages first.

Key Features & Practical Use Cases

  • Getting a scanned ID, certificate or form under a 1 or 2 MB upload limit.
  • Making a long scanned document small enough to attach to an email.
  • Shrinking photo-heavy PDFs such as brochures or portfolios before sharing them.

Frequently Asked Questions

Why can't I select the text after compressing?

Each page has been turned into an image; that's how the file gets so much smaller. Keep the original if you need searchable text.

Why did my PDF get bigger?

Text-based PDFs are already compact, and turning their pages into images adds size. The tool warns you when that happens. A PDF like that usually doesn't need compressing.

What quality setting should I use?

Around 70% for documents people will read on screen, and 50 to 60% when you need to hit a strict size limit. Always check small text in the preview first.

Is my PDF uploaded?

No. The pages are rendered and compressed in your browser, so the file never leaves your device.

About OneClickly

OneClickly is a set of 119 free tools for PDFs, images, text, everyday math and code. They run in your browser, so the files and text you work with stay on your device.

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