Compress PDF Tool

Shrink your PDF file size right in the browser. No upload, no watermark, no sign-up — your document never leaves your device.

Drop your PDF here or click to browse files

Up to 200 pages at a time · compressed entirely in your browser

Why Use Our PDF Compressor

Cut your PDF down to a fraction of its original size — with full privacy.

100% Private & Secure

The entire compression runs on your local device. Your PDF is never uploaded to a server, never stored, and never shared.

Instant Results

No waiting in line. The file is processed instantly in your browser and the download starts as soon as it is ready.

Adjustable Quality

A single slider gives you precise control over the balance between file size and sharpness, so you always get the result you want.

How to Compress a PDF in 3 Steps

From start to download, it takes less than a minute.

Select your PDF

Drag the PDF into the dashed box, or click to browse local files. Up to 200 pages are supported.

Adjust the quality

Drag the quality slider to trade off file size against sharpness — the lower the value, the smaller the output.

Download your file

Click Compress and your file is generated locally and downloaded automatically in seconds.

Free Online PDF Compressor

PDF compression is a fully online tool that shrinks any PDF directly in your browser. It works by re-rendering every page and re-encoding the content as efficient JPEG images, then rebuilding a leaner, high-quality PDF. There is no server, no upload, and no registration — everything happens locally on your device.

Oversized PDFs are one of the most common annoyances of everyday work: email attachments get bounced back, cloud storage fills up, and files open painfully slowly. Whether you want to shrink a scanned contract before sending it, compress a presentation that keeps exceeding the size limit, or free up space on your phone, our tool has it done in seconds. And because your files never leave your device, it is also the safest option for confidential documents.

Who Should Use PDF Compression

  • Professionals — fit presentations and reports inside strict email and upload limits.
  • Students — compress scanned notes and textbooks to store them more easily in the cloud or on learning platforms.
  • Photographers & designers — shrink image-heavy PDF portfolios before sending them to clients.

Why It's Better Than Desktop Software

  • Works anywhere — no installation needed; runs on Windows, macOS, Linux, iOS and Android.
  • Zero privacy risk — files are processed locally and never sent over the network.
  • Adjustable quality — fine-tune how much space you save with one slider.
  • Always free — no subscriptions, no hidden fees, and no watermark on your output.

PDF Compression FAQ

Answers to the most common questions about reducing PDF file size online.

Does compressing a PDF reduce its quality?

Compression mainly saves space by lowering the resolution of embedded images and re-encoding them as efficient JPEGs. Because pages are re-rendered before compression, text stays crisp. You can also use the quality slider to choose the balance between sharpness and size yourself.

Is this online PDF compressor really free?

Yes. This tool is completely free — no limits, no watermark, no registration. All compression happens locally in your browser.

Will my files be uploaded to a server?

No. Your files are processed entirely on your own device and are never sent to any server, so your documents remain only on your computer.

Why didn't my file get smaller?

If the source PDF is already well optimized, contains only vector text, or is already small, JPEG re-encoding may not save much space. Try lowering the quality slider to apply stronger compression.

How many pages can I compress at once?

You can compress one PDF at a time, up to 200 pages. A progress bar shows the live status, and the download starts automatically when it finishes.