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Compress PDF

Rewrite PDFs with efficient object streams and local cleanup.

Add Files

Files stay in this browser unless the tool explicitly asks for cloud consent.

Settings

Configure the operation before processing.

Client-side compression can rewrite object streams and metadata. Deep image recompression needs a dedicated raster optimizer.

Run

Ready when your file is.

About Compress PDF

Compress PDF is a free online tool that rewrites a PDF with compact object streams to reduce its file size, directly in your browser. It shows the original and new size so you can compare. It does not downsample embedded images, so savings are largest on text-heavy and structurally bloated files.

Last updated: · By Derar Sattouf

How to use Compress PDF

  1. Add the PDF you want to make smaller.
  2. Pick a preset: Screen, Print or Press, and adjust the quality target.
  3. Click Compress PDF.
  4. Compare the before and after size, then download the compressed file.

Features

  • Three presets: Screen, Print and Press
  • Shows the original and compressed file size
  • Keeps text selectable and pages unchanged
  • Batch compression for many PDFs in Batch Tools
  • Runs locally with no upload

Frequently asked questions

Is Compress PDF free?

Yes. Compress PDF is completely free, with no account, no sign-up, no watermark added to your files and no daily limit.

Are my files uploaded when I use Compress PDF?

No. The PDF is opened and processed inside your browser with JavaScript, so the file never leaves your device and is not stored on any server.

How much smaller will my PDF get?

It depends on the file. The tool rewrites the PDF structure with object streams, which helps most with text-heavy or poorly saved files. Scanned PDFs made mostly of large images may shrink only a little because images are not recompressed.

Will compressing reduce quality?

No. Pages, text and images are kept as they are; only the internal structure of the file is rewritten.

Is there a file size limit?

Each PDF can be up to 50 MB. Because processing happens on your device, very large or image-heavy files may take longer on older phones and laptops.

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