Are you making any piece of software that receives an ID from user input and returns a {post, image, whatever}?
May I suggest: base 36?

Just look at this:

What looks better?
Thought so.

You can convert between bases easily in any language, so you have no excuse not to!
You don’t need to store the base36 value, accept it in URLs and convert it to base 10 for your database operations – then when displaying the URL to the end user convert from base to base 36.

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