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Compress PDF

Try lossless PDF optimization without rasterizing pages. Compare the result size; already optimized PDFs remain unchanged when no smaller file is available.

Try reducing a PDF through lossless preparation rather than turning every page into a lower-resolution picture. The current method targets eligible uncompressed image streams. It retains the original bytes when a suitable smaller result is not available, so not every PDF will shrink.

  • 100% free
  • No registration
  • On your device
  • Modern browser
  1. 1Choose files
  2. 2Choose options
  3. 3Download
Drag & drop your PDF file hereor click the button below to choose a fileSelect PDF file

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Tip: You can also paste files directly (Ctrl+V / Cmd+V)

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Lossless compression preserves text, images and page appearance. Already optimized PDFs are kept unchanged when no smaller result is available.

Your input stays on this device for this operation. We don’t upload or store it.

About Compress PDF

Try reducing a PDF through lossless preparation rather than turning every page into a lower-resolution picture. The current method targets eligible uncompressed image streams. It retains the original bytes when a suitable smaller result is not available, so not every PDF will shrink.

Lossless stream treatment

Eligible unfiltered image streams can be compressed without downsampling their pixels.

Original-size fallback

The input is retained when the preparation cannot produce a suitably smaller file.

Visible result size

The workspace reports the size and whether lossless optimization or the original was used.

How to use Compress PDF

  1. 1

    Choose a PDF

    Add the PDF you want to check and keep an original copy.

  2. 2

    Run compression

    Use the compression action and review the reported method and result size.

  3. 3

    Inspect the result

    Download the PDF and compare the page count, small text and image appearance before submitting it.

Formats and practical limits

Input: PDF, within the 250 MB preparation limit. Output: an optimized PDF or the original PDF bytes when no suitable reduction is found.

  • This is not a lossy scan-quality slider or a guaranteed target-size compressor.
  • Unusual page dimensions or unsupported inputs can be rejected; review the workspace message rather than repeatedly submitting the same file.

Practical example

If a 4 MB scan must fit a 2 MB form limit and the result remains 4 MB, reduce scan resolution in the source workflow or extract only the required pages; do not assume another lossless run will meet the limit.

Frequently Asked Questions

3 answers
Can I force a PDF below a fixed KB limit?

No. This tool does not guarantee a target size or lower image resolution to reach one. Already-compressed scans may not shrink.

Does compression run OCR?

No. It neither recognizes scan text nor makes image-only pages searchable.

Why does the result say the original was kept?

The lossless preparation did not find a suitable reduction. Keeping the original avoids handing you a larger or unnecessarily rewritten file.

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