All Tools

Compress PDF

Reduce PDF size with lossless or image-quality presets and compare the before and after sizes.

  • Free to use
  • No registration
  • Simple workflow
  • Works on any device

Upload & process

Choose your file and configure the available options.

Drag & drop your PDF file here

or

Maximum file size: 25MB · Up to 40 pages

Compression Options

Quality presets recompress eligible images while keeping PDF text. Transparent images are skipped. Already optimized PDFs may not shrink.

Choose a PDF to begin.

How it works?

  1. Upload your PDF document.
  2. Choose a compression preset.
  3. Compare the original and output sizes.
  4. Preview and download your PDF.

Your Security, Our Priority

  • Files are uploaded for processing.
  • Temporary working files are removed.
  • Previewing the result uploads it for rendering.
  • See our Privacy Policy for data handling.
Temporary file processing

Supported

  • Maximum file size: 25MB
  • PDF documents with 1–40 pages
  • Password-protected PDFs are not supported.
  • Output format: PDF

Tips

  • Start with Lossless to keep image quality.
  • Image presets can soften scanned text.
  • Already compact files may not shrink.
  • Check signatures, forms, links and bookmarks.
Practical guide

How to use Compress PDF

What this tool helps you do

PDF compression reduces the bytes needed to store a document. Lossless compression repacks objects and streams without reducing image quality. Balanced and Smaller file also resize and recompress eligible images while keeping document text as text.

When it is useful

  • Meeting an attachment size limit
  • Reducing image-heavy scanned PDFs
  • Preparing lighter downloads

A practical example

A scan containing large photos may shrink with Balanced. A compact text-only PDF may show no saving; in that case the original file is returned unchanged.

Limitations and common mistakes

No preset guarantees a target file size. Lossy compression can soften scanned text and photos. Existing digital signatures may be invalidated. Inspect forms, links and bookmarks after processing. Keep your source file.

How to use Compress PDF

  1. Choose one unencrypted PDF.
  2. Start with Lossless if image quality matters. Choose Balanced or Smaller file if you can accept reduced image detail.
  3. Compress and compare the displayed sizes. Preview the output, then download and inspect fine print.

Inputs and processing

PDF up to 25MB and 40 pages. Files are uploaded for server processing. Lossless uses qpdf stream and object compression. Balanced uses JPEG quality 80 and a 1600-pixel maximum image dimension; Smaller file uses quality 55 and 1000 pixels. Transparent images are skipped. Image presets support at most 100 unique images and 80 million decoded pixels; use Lossless for larger image workloads.

If something goes wrong

The size did not change

The PDF may already be optimized. Try an image preset if reduced image quality is acceptable.

Fine text looks soft

Use Lossless or Balanced rather than Smaller file. Start again from the original.

Frequently asked questions

Will I receive a larger file?

No. If the processed version is not smaller, the original is returned unchanged.

Does compression delete pages?

No. This tool does not intentionally remove pages or page text.

Read the related in-depth guide →