Compress PDF Online
Reduce a PDF file size online when a document is too large to upload, email or store comfortably.
Important: Smaller PDF is a target, not a guaranteed output size. Compression results depend on the original PDF.
General PDF compression
Use the Tooloos PDF compressor
Choose an appropriate compression level, then check the downloaded file size and document quality.
Compress PDF
Analyse text and scanned pages, then apply smart local compression with target-size guidance and visual comparison.
How to work toward Smaller PDF
- 1
Upload the PDF you want to make smaller.
- 2
Choose a compression level that fits your quality needs.
- 3
Run the compression and download the result.
- 4
Open the compressed PDF and verify text, images and page quality before using it.
Why the final PDF size can vary
PDFs can contain text, images, scans, fonts, forms and other embedded assets. Two files with the same page count may compress very differently.
Full-page scans usually consume more space than text-based pages and may need stronger image compression.
High-resolution images can make PDFs large. Reducing image detail can save space but may affect clarity.
Longer documents generally need more aggressive optimization to reach very small limits.
A portal may require a maximum size. Treat the stated limit as a verification step after compression rather than a guaranteed result.
Questions about compress pdf online
Will the compressed PDF look exactly the same?
Compression can change image detail, embedded assets or other elements. Always check the downloaded PDF before replacing the original.
Can I guarantee an exact final size?
Not always. The achievable size depends on the original document, image content, fonts and compression method.
Should I keep the original PDF?
Yes. Keep the original file until you have checked the compressed copy and confirmed that it is suitable for your purpose.