How to reduce PDF size without losing quality
Start with the safest optimization path, then move to stronger settings only when you need more savings.
1. Remove waste before changing visuals
A good PDF optimization flow begins with cleanup steps that do not intentionally change what the reader sees. This includes removing unnecessary objects, compressing streams more efficiently, and consolidating duplicated resources where possible.
That is why a strict mode is often the best first pass. It aims for smaller files without jumping immediately into image downsampling or stronger visual trade-offs.
2. Recompress images only when needed
Images are often the largest source of PDF weight. Recompressing them can save a lot of space, but it is also the point where visible differences become more likely.
If the document contains screenshots, scans, or photos, balanced mode can be a practical next step. If every small visual detail matters, keep image recompression off unless testing shows the result is acceptable.
3. Use downsampling with a clear purpose
Downsampling lowers image resolution and can dramatically reduce file size, especially for high-DPI scans. It is useful for screen-first documents but may not be ideal for print-sensitive material.
Choose downsampling when the main goal is lighter distribution over web or email, not archival or print fidelity.