How does this PDF compressor reduce file size?

It rebuilds the PDF locally, writes compressed object streams, and removes common metadata. It is most effective on PDFs that were not already optimized.

Can it compress every PDF to 100KB or 200KB?

No. The final size depends on page count, images, fonts, and how the PDF was created. The tool reports the real before and after sizes instead of forcing a misleading target.

Are PDF files uploaded?

No. This is a static browser tool. Your PDF is processed locally and is not uploaded by BaseToolbox.

Will text and images lose quality?

The first version does not rasterize pages or intentionally lower image quality. If your PDF contains already-compressed images, the size may not change much.

PDF Compressor - Reduce PDF Size Online

PDF Compressor

Reduce PDF file size locally in your browser. Rebuild PDFs with object stream compression and compare the result before downloading.

Local compression with clear limits

This tool works best on PDFs that are not already optimized. It does not upload files and may have limited effect on PDFs with large images that are already compressed.

Click or drag a PDF file here

Maximum file size: 80 MB. Files stay in your browser.

Compress PDF files without uploading them

This PDF compressor rebuilds your document in the browser, enables PDF object stream compression, removes common metadata, and compares the new size with the original before download.

When to use this PDF compressor

Try to reduce the size of scans, forms, and PDF attachments before sharing.
Make a PDF easier to attach to email or upload forms with file size limits.
Clean up PDFs before submitting applications, invoices, or paperwork.
Handle private PDF files locally instead of sending them to a remote converter.

Related PDF tools

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PDF Compressor FAQ

How does this PDF compressor reduce file size?: It rebuilds the PDF locally, writes compressed object streams, and removes common metadata. It is most effective on PDFs that were not already optimized.
Can it compress every PDF to 100KB or 200KB?: No. The final size depends on page count, images, fonts, and how the PDF was created. The tool reports the real before and after sizes instead of forcing a misleading target.
Are PDF files uploaded?: No. This is a static browser tool. Your PDF is processed locally and is not uploaded by BaseToolbox.
Will text and images lose quality?: The first version does not rasterize pages or intentionally lower image quality. If your PDF contains already-compressed images, the size may not change much.