True Type Font TTF installation error on Mac OS X Lion & converting it to Open Type OTF

I’m about to get my new iMac in shape with all the tools, special configurations and programs. In addition, I just right now wanted to install a font I use regularly for some of my designs. The new Computer runs on Mac OS X Lion while all other computers on which the font was in use previously were on Snow Leopard. To my surprise the installation process via Font Book stalled with an error:

Problems may have been found with some fonts during validation:
<corrupt font name> x
 Font basic parsability x.

While x means a serious error and it is not suggested to use the font. Boooaah!

Googling yielded very few details about it, so I decided to quickly post the solution I found here (at least until now that all seems to work fine and the font was installed without an error. All I did is convert the TTF font file into an Open Type Font file, which I did using this free font converter.

Hey, if this helped you solve your font problem, feel free to link to this page and leave a comment with your page below. Thanks for sharing!


  1. You’re my hero! I’ve been having this problem for a while now and didn’t found a solution until I stumbled on your post. Thanks a lot for sharing.

  2. Thanks for this – I have spent ages looking in the Mac forums about how to get a specific font to install, the way you show (using the font conversion website) has just sorted the issue out for me and I have been able to install on my MBP with no issues. Big help, thanks!

  3. The site you recommended fixed the issue. I had fonts I had downloaded from DaFont that were corrupted. Converting to Open Type Font format allowed Font Reader to add it.

    Seriously…thank you for figuring this out AND sharing.

  4. Thanks, this was super helpful. I just bought a font and ran into the same issue. Followed your tips and it worked flawlessly.


  5. Thank you so much for posting the link to the free font converter! After recently switching from Windows to Mac, transferring fonts was resulting in errors (and headaches). I was getting worried that I would have to substitute different fonts for my designs! What a relief that I don’t have to! Thank you!

  6. has a converter built in. Just select OTF before you download.

    This fixed the problem I had with a couple of ttf fonts that gave this error message.

    Thanks so much for pointing me in the right direction.

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