“Without losing quality” is marketing. Encoding always discards something. The practical version: lose pixels a reviewer will not notice.
- Crop before you compress.
- Stay at 0.75–0.85 for anything with faces or stamps.
- Do not rasterize a digital-born text PDF unless you must; the original vectors are smaller and sharper.
- Repair PDF sometimes shrinks a bloated export by rewriting object streams.
Our compressor exposes the quality number instead of hiding it behind “strong / medium / low”.