Local processing

Compress PDF Online Free

Reduce PDF file size through structural optimization or visual compression. The document is processed directly in your browser and is not uploaded to our servers.

Local and private processing

Compress PDF Online

Reduce PDF file size through structural optimization or visual compression.

The document is processed directly in your browser and is not uploaded to our servers.

Drop a PDF file here

You can also select the document from your device.

PDF files onlyRecommended maximum: 100 MB
The file remains on your device
No registration required
Free tool
Structural optimization preserves the appearance and normally keeps text selectable. Reduction may be small or nonexistent, and links, forms and digital signatures should be reviewed in the result.

How to compress a PDF document

  1. 1

    Select the document

    Upload the PDF file from your device.

  2. 2

    Choose the compression method

    Use structural optimization or visual compression according to your needs.

  3. 3

    Download the result

    Compare the original and output sizes and download the processed document.

Recommendation

Start with structural optimization. Use visual compression when you need a greater reduction and preserving selectable text or interactive elements is not essential.

Structural optimization

This method reorganizes the PDF structure and attempts to remove redundant information without converting every page into an image.

  • Selectable text is usually preserved.
  • Vectors and type remain sharper.
  • Already optimized files may shrink only slightly.
  • It is the recommended option for digital documents.

Visual compression

This method renders each page as an image and rebuilds the document. It can provide a greater reduction for scanned PDFs or files containing many images.

  • Text is no longer selectable.
  • Sharpness may decrease depending on the selected level.
  • Links and interactive forms are not preserved.
  • It can be useful for lightweight visual copies.

Why a PDF may shrink very little

  • The file was compressed previously.
  • It mainly contains lightweight text and vectors.
  • Its images already use efficient compression.
  • Some objects cannot be removed without changing the document.
  • In some cases the output may become slightly larger.

What to review before sharing

  • Check that small text and graphics remain readable.
  • Confirm that every page is present.
  • Verify that the output is actually smaller.
  • Confirm that forms, links or signatures are not required.
  • Open the result on another device before sharing it.
Frequently asked questions

Questions about PDF compression

How do I compress a PDF file?

Select the document, choose lossless optimization or visual compression and press Compress PDF.

How can I reduce PDF file size?

Try structural optimization first to preserve the document more closely. If you need a larger reduction, visual compression can make the file smaller by rebuilding pages as optimized images.

What is the difference between lossless optimization and visual compression?

Structural optimization preserves the appearance and normally keeps text selectable. Visual compression converts every page into an image and usually provides a greater size reduction.

Will the text remain selectable?

Normally yes when using structural optimization. Visual compression converts pages into images, so the text will no longer be selectable.

Why do some files not become smaller?

Some PDF files are already optimized or contain structures that cannot be reduced further without converting their pages into images.

Is my document uploaded to a server?

No. The PDF is processed locally inside your browser and is not uploaded to SG Hub servers.