What is Tableizer?
Tableizer lets you copy/paste spreadsheet cells from any spreadsheet software and convert it to an HTML table.
Does Tableizer retain the data I submit?
No. Whatever you submit to the tool is processed and immediately destroyed. Tableizer does not store your submission.
How do I make my table sortable?
I recommend using the Tablesorter jQuery plugin or the DataTables jQuery plugin, though there are other good ones out there.
To use either plugin, upload a copy of the plugin to your own server. Then, link to the script in the <head> area of your site along with a link to a recent version of jQuery.
How do I make my table searchable?
The DataTables jQuery plugin is a good one for this. See above question.
How can I further customize my table?
You can add any custom styles to your table by adding CSS to the <style> area of the code generated by Tableizer. There's a pretty neat table style generator here. There's also a primer on styling tables with CSS.