Everything you need to master PDF file size reduction. Choose an exact file size target, solve problem documents, or learn how client-side privacy works.
Your files are never uploaded to our servers — all compression happens right inside your browser
or pick several files at once from your device
PDF files are the global standard for documents, but high-resolution photo scans, uncompressed font subsets, and complex vector illustrations can inflate files beyond standard sharing limits. This hub connects you to dedicated tools and practical troubleshooting guides.
Need to satisfy an exact portal ceiling such as 100 KB, 200 KB, 500 KB, or 1 MB? Our programmatic target-size engine automatically tests multi-pass compression parameters to reach your desired file size without manual guessing.
From email attachments on Gmail and Outlook to WhatsApp mobile transfers and governmental online application portals, understand the exact size limits and optimal settings for every destination.
Start by identifying the contents of the document. Scanned pages require image downsampling and JPEG quality adjustment, while vector files benefit from object stream compression and metadata stripping.
The tool tests several rendering scales and JPEG quality factors sequentially in your browser. It selects the smallest output that stays at or below your target threshold.
Yes. Every tool and guide on Kompres PDF is 100% free with no registration, no file limits, and zero server uploads.