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Compress PDF Online

🟢 Runs Locally — verified: your files are processed in this browser. No uploads.

Reduce a PDF file size in your browser. Choose a compression level and download a smaller PDF — no uploads, no watermarks, no limits.

Start now ↓

Drop, process, download

Processing happens on your device — your documents never leave the browser.

How to use this tool

  1. 1

    Upload your PDF

    Drag and drop a PDF into the upload zone, or click to browse your device.

  2. 2

    Choose a compression level

    Pick Small file (96 DPI), Balanced (150 DPI) or High quality (200 DPI).

  3. 3

    Compress & download

    Click Compress PDF, then download the smaller file once processing finishes.

Key features

At a glance

LevelBest for
Small — 96 DPIEmail & smallest file size
Balanced — 150 DPIEveryday documents
High quality — 200 DPISharper text & images
Scanned PDFsCompress especially well

Frequently asked questions

How does PDF compression work?
Each page is re-rendered at the chosen resolution and re-embedded into a new PDF. This works best for scanned or image-heavy PDFs; text becomes a rendered image and is no longer selectable.
Is my PDF uploaded to a server?
No. The entire process runs in your browser using pdf.js and pdf-lib — your document never leaves your device.
How much smaller will my PDF get?
It depends on the content. Image-heavy and scanned PDFs usually shrink the most; already-optimised PDFs may not shrink further.

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