在保持质量的同时减小PDF文件大小。
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Choose a compression level — high, medium, or low — and pdfs.to runs Ghostscript with downsampling, font subsetting, and duplicate-image detection to shrink your PDF.
If the optimised file ends up larger than the original (rare, but possible for already-compressed PDFs), we return the original instead so you never end up with a bigger file.