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Fix a PDF that won't open, or won't open properly: the internal table of contents is rebuilt and whatever is damaged is rescued as well as possible. Optionally make it smaller without loss and optimize it for the web. Everything happens in your browser.
Drag one PDF here
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Technical details (qpdf)
This tool runs entirely in your browser: your PDF is not sent to a server. A password-protected PDF will not open here; remove the protection first with the Unlock tool.