Is there any online .plist editor?

There's Plistinator - its a native C++/Qt app for Mac, Windows and Linux desktop. So not an online tool, but it is at least portable and runs cross-platform (in case that is what the request for a web-based editor was about).

I'm not sure if the JS version handles binary files (Plistinator does). If you have a Mac you could edit them via the JS editor if you convert binary to XML via

plutil -convert xml myfile.plist

Note that will over-write myfile.plist with the XML version, which may not represent all the same information that the binary version can.

Full-disclosure: I am the author of Plistinator and the $12.99 goes to pay for my ramen & rent.

I have resigned myself to the fact that there probably isn't one I will ever find. What I have found, however, is that JSON format and text PList format are very similar, and there are plenty of JSON editors available online and for windows and mac both. It may not be suitable for your needs, but it suited my needs just fine. By using nothing more than a couple of find & replaces in Notepad you can get 90% of the way to a plist file. The only big issue is semicolons vs. commas.

If you're working on a small enough file, that could be done manually. With larger files, a simple utility app to convert JSON to PList files would probably be pretty simple to whip up if you've got the urge.

Again, this all applies only to text formatted plist files. Most plist editors on mac at least can save a plist in text format.

So, I was wondering the exact same thing, and when I saw this question and its answer, I said "Screw it, I'm making one!" And so I did. Two days later, here's my answer to you:

http://tustin2121.github.io/jsPlistor/

jsPListor (version 1 as of Aug 8th, 2013) will allow you to paste in the contents of an xml plist into it (via the Import button) and edit it with drag and drop and the like. When you're done, hit Export and it will package it all up into a valid plist for you to copy and paste back into the file.

There's still some bugs and glaring vacancies (like the Data Editing Dialog), but it functions. Future versions will attempt to allow saving via html5 download, and loading of files into data rows.

Feel free to examine, contribute, and submit bugs at the github repo: https://github.com/tustin2121/jsPlistor