Free PDF Compressor
Compress PDF pages with adjustable image quality. Compare the original and processed file sizes before downloading.
Browser-based processing
Your selected PDF is processed in your browser by this tool. The compression code does not upload it to a ToolBoxAI server. A PDF.js worker library is loaded from a public CDN when processing starts.
Choose compression level
Important quality note
This method converts each page into an image. Text may no longer be selectable or searchable, and links, forms and other interactive PDF elements may not be preserved. Compression results vary; some PDFs may become larger.
How to compress a PDF
- Select a PDF file up to 30 MB.
- Choose Low, Medium or High Compression.
- Click Compress PDF and wait for processing to finish.
- Compare the file sizes and download the result.
Frequently asked questions
Will the PDF always become smaller?
No. Results depend on the original PDF and the selected compression settings.
Will I be able to select text in the result?
No. This image-based method rasterizes the pages, so text is no longer searchable or selectable.
Is the original PDF changed?
No. The original file remains unchanged on your device.