Compress PDF to 100KB Free — Step by Step Guide 2026

✅ Tip 1: Use Maximum compression

Always start with Maximum mode. For most scanned documents, this reduces size by 70-85%. Text remains perfectly readable.

✅ Tip 2: Split multi-page PDFs

If you need to upload a 10-page document but the portal only needs 2 pages, use our Split PDF tool first, then compress only the required pages.

✅ Tip 3: Re-scan at lower DPI

If you're scanning a document, use 150 DPI instead of 300 DPI. This reduces the source file size by 75% before any compression. 150 DPI is sufficient for text documents.

✅ Tip 4: Convert to grayscale

Color scans are 3x larger than grayscale. If the portal doesn't require color (most don't), scan in grayscale or black-and-white mode to dramatically reduce file size.