现在修复损坏的PDF文件，修复效果比较不错的只有“Recovery Toolbox for PDF ”这个软件了，而且是收费的，很难找到破解版，只有windows版本。
找了很久，才发现Linux下确实有非常好的方法修复PDF文件，两种方法结合起来，效果更好：
1.mutool clean bad.pdf good.pdf
导出来的文件已经基本修复得差不多。
2.pdftocairo -pdf good.pdf best.pdf
这样就能导出恢复效果比较好的pdf文件，当然不能保证能恢复100%的内容。
—— English version——
The best PDF recovery software is “Recovery Toolbox for PDF” in Windows, but it is not free and no crack version.
I find the useful tools for a long time, and find a best way in Linux to repair corrupted PDF file.Combining two methods will be good:
1.mutool clean bad.pdf good.pdf
This way pdf file is to be recovered the the most data .
2.pdftocairo -pdf good.pdf best.pdf
这样就能导出恢复效果比较好的pdf文件，当然不能保证能恢复100%的内容。
This way is to continue to recover the visible content.
mutool is from http://mupdf.com/ and pdftocairo is from poppler.
Original Page:http://superuser.com/questions/278562/how-can-i-fix-repair-a-corrupted-pdf-file
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