Compress a PDF online
Shrink a heavy PDF so it fits an email or upload limit — processed on your own device, never uploaded.
Runs entirely in your browser. Your PDF is never uploaded.
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Drop your PDF here, or click to choose
Runs in your browser · nothing is uploaded
Balanced suits most scans. Choose "Smaller file" for the tightest size, or "Better quality" to keep pages crisp.
How to use the PDF compressor
- Drop the PDF you want to shrink onto the box, or click to choose it.
- Pick a compression level. Balanced is a good default; Smaller file squeezes harder, and Better quality keeps pages sharper at a larger size.
- Press Compress PDF. The tool rebuilds the file on your own device and shows you the before and after size.
- Download the smaller file if you are happy with it. Your original stays exactly as it was.
What you can use it for
Fitting an upload limit is the reason most people compress a PDF. Government portals, job sites and exam forms routinely cap uploads at 1 or 2 MB, and a phone-scanned document sails past that easily.
Email is the other big one. A 25 MB scanned booklet that bounces back becomes a 3 MB attachment that sends without a second thought.
Anyone storing or sharing lots of scanned paperwork — invoices, receipts, signed forms — uses it to keep folders and shared drives from ballooning.
It is especially effective on documents that are really photographs of pages, which is where the wasted size usually hides.
Things to know
This compressor works by re-rendering each page and re-encoding it, which is what makes scanned and image-heavy PDFs shrink dramatically. The trade-off is that pages become images, so selectable text in a born-digital PDF may no longer be selectable after compression.
For scans and photos of documents that is exactly what you want. For a text PDF you need to keep searchable, use "Better quality" or keep the original — the tool always shows the new size before you download so you can judge.
Results vary with the source. A file that is already tightly optimised may barely shrink; a heavy phone scan can drop by 80 percent or more.
Everything runs in your browser, so even a sensitive document is compressed on your own machine and never uploaded.
Frequently asked questions
No. The file is rebuilt entirely in your browser and never sent anywhere. You can confirm this by going offline after the page has loaded.
To achieve real size savings the compressor renders each page and re-encodes it as an image. That is ideal for scans, but it means a born-digital PDF's text becomes part of the image. Keep the original if you need the text to stay searchable.
It depends on the source. Scanned and photo-based PDFs often shrink by 60 to 90 percent. A file that is already optimised or mostly plain text will shrink much less. The tool shows the exact new size before you download.
Usually yes, but very large files use more of your device's memory because each page is rendered. On a low-end phone a huge document may be slow.
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