Link Safe

PDF files usually do an accurate job of presenting documents in a format that can be opened by anyone with a PDF reader, but occasionally something goes wrong such as fonts or tables not displaying correctly. There are several online tools that promise to repair corrupt PDFs, but most have a catch such as charging you to download the fixed file or superimposing a watermark on it. One of the best free options is PDFaid’s Repair PDF tool (bit.ly/pdfrepair), which looks a bit cheap and nasty, but actually works well, although it limits you to files up to 20MB in size. We also like the online PDFrepair tool from the improbably named Weeny Software (bit.ly/weeny).