Three presets + Custom
Highest quality uses 97%, Balanced 92%, Smaller file 82%, and Custom lets you choose 55–98%.
033 · PDF
PDF Compressor
Compress PDFs in your browser with Highest quality, Balanced, Smaller file, or Custom quality, plus real size comparison and result preview.
LOCALPDF contents stay in this browser and are not uploaded to a server.
LOCALBrowser-local processing · no server upload
Drop or choose a PDF
Choose one PDF to open compression settings and preview.
HOW TO USE
How to use
- 01
Choose one PDF.
- 02
Choose Highest quality, Balanced, Smaller file, or Custom.
- 03
In Custom, adjust image quality manually.
- 04
Run compression and compare the real before/after sizes and result preview.
- 05
Download after checking quality and size.
WORKFLOW GUIDE
What to verify when compressing PDFs
Compress PDFs in your browser with Highest quality, Balanced, Smaller file, or Custom quality, plus real size comparison and result preview.Balanced 92% is the default
The initial setting targets a practical balance between visual quality and file-size reduction.
Only real bytes count
The tool reports actual Blob size and calculated reduction instead of promising a preset compression rate.
Preview the saved result
The preview reloads the final saved PDF bytes, not an intermediate canvas.
Pages are rebuilt as images
All compression settings rebuild pages as images, so searchable text, links, forms, annotations, and vector data may be lost.
Local for sensitive files
PDF content and output stay in the current browser without server upload.
IMPORTANT NOTES
Important notes
- Even Highest quality rebuilds PDF pages as images and does not preserve the original PDF structure exactly.
- Lower quality usually creates a smaller file but may reduce image and text sharpness.
- Searchable text, links, forms, vectors, and annotations may be lost.
- Rewriting a digitally signed PDF can affect signature integrity.
- Encrypted PDFs are not compressed by this tool.
FAQ
FAQ
01Which setting should I start with?+
Balanced 92% is the default recommendation. Use Highest quality 97% when visual fidelity matters most, or Smaller file 82% when size matters more.
02What is the Custom range?+
You can set image quality from 55% to 98%.
03Can you guarantee exactly 1MB?+
No. Result size depends on PDF content, so a specific target is not guaranteed.
04Can text become blurry?+
Yes. Lower quality can reduce small-text and image sharpness.
05Is my PDF uploaded?+
No. Processing is designed to stay in your browser.