PDF Compression

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Everything runs locally in your browser; files are never uploaded. The tool auto-detects the PDF type: scanned or image-based PDFs use image compression, text/vector PDFs are flagged as unsuitable, and mixed PDFs warn about possible quality loss.
Lossy compression: **every page** will be converted to a JPEG image. Text cannot be searched or copied; vector elements, forms, links, annotations and some transparency may be lost. Recommended for scanned or image-based PDFs.
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PDF analysis

Compress PDF Online - Reduce PDF File Size for Scanned and Image-Based PDFs

What is PDF compression?

PDF compression reduces the file size by re-rendering PDF pages and recompressing the images on each page. This tool is mainly designed for scanned PDFs, image-based PDFs, and PDFs containing mostly bitmap content. All processing takes place locally in your browser, and your files are never uploaded to a server.

What types of PDFs are suitable for compression?

If a PDF mainly contains scanned pages, photos, or other bitmap images, recompressing the page images can significantly reduce the file size. For PDFs that have already been highly optimized, the compressed file may not become significantly smaller and may even be slightly larger.

Will PDF compression affect text?

Yes. This tool uses a lossy compression method that re-renders each page. Text, vector graphics, and some interactive content in the original PDF may be converted or lost. The compressed PDF may no longer support the original text search and copy functions.

What PDF compression levels are available?

Three compression levels are available: Strong Compression, Recommended, and High Quality. Strong Compression prioritizes a smaller file size, High Quality prioritizes image quality, and Recommended provides a balance between file size and visual clarity.

How do I compress a PDF?

Select a PDF file, choose a compression level, and click Start Compression. When processing is complete, the tool shows the original size, output size, and actual size change. You can then download the compressed PDF directly.

Is PDF compression safe?

Files are processed locally in your browser and do not need to be uploaded to a server. This makes the tool suitable for PDF files that you do not want to upload to a third-party service.

Why is my compressed PDF larger?

If the original PDF has already been optimized or its images have already been compressed, regenerating the PDF may add additional structural data. As a result, the output file can sometimes be larger than the original. The tool reports the actual file size instead of falsely claiming a successful reduction.

Can I still search text in a compressed PDF?

Not necessarily. Because each page is re-rendered as an image, the original text layer may be removed. If you need to preserve text search, copying, vector content, forms, or annotations, avoid this type of lossy compression.

What is the maximum PDF file size?

The maximum supported size for a single PDF file is 30 MB.

What is PDF compression?

PDF compression reduces file size by re-rendering PDF pages and recompressing images. This tool is especially suitable for scanned and image-based PDFs, with all processing performed locally in your browser and no file uploads.

  • Ideal for scanned PDFs, image-based PDFs, and PDFs containing mostly image content
  • Three compression levels: Strong Compression, Recommended, and High Quality
  • Reduces PDF size by re-rendering and recompressing page images
  • Shows the original size, output size, and actual file size change
  • Compressed text may become images and may no longer be searchable or copyable
  • All processing takes place locally in the browser and PDF files are never uploaded
Important: This is a lossy compression method. Pages are re-rendered as images, so the original text layer, vector content, forms, links, or annotations may be affected. Compressed PDFs are not suitable when you need to preserve searchable text, copyable text, or vector content.
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