PDF Compressor
Reduce PDF file size while maintaining quality.
Click to upload a PDF
Select a PDF file to compress
PDF compression is essential for sharing documents efficiently. Large PDF files can be problematic for email attachments, cloud storage, and web downloads. Our free online PDF compressor reduces file size while preserving text quality and readability.
The tool works by optimizing internal PDF structures and recompressing embedded images. Text content remains sharp and fully searchable, while images are re-encoded at an optimized quality level. This approach typically achieves 30-70% file size reduction.
All processing happens in your browser using the pdf-lib library, ensuring your documents never leave your device. This is particularly important for confidential business documents, legal files, and personal records.
Email attachment limits (typically 25MB) and slow downloads make PDF compression essential. Our tool compresses PDFs without compromising readability, all while keeping your documents private.
- Upload your PDF file
- Wait for compression to complete
- Download your smaller PDF
- Compress PDFs before sending as email attachments to avoid rejection by mail servers.
- For documents with many images, expect higher compression ratios than text-heavy PDFs.
- Always verify the compressed PDF looks correct before deleting the original.
- Scanned documents (image-based PDFs) benefit the most from compression.
- Compress large PDF portfolios to save significant cloud storage space.