PDF 转 PNG
把 PDF 页面导出成清晰的 PNG 图片，文字较多的页面尤其适合，能避开 JPG 压缩带来的字迹发糊。
来自
To
The universal document format. Looks the same on every device — the standard for documents that must not change.
PNG
A sharp, high-quality image format with support for transparent backgrounds. The go-to choice for screenshots, logos, and icons.