I actually just did this exact swap last week to rebalance my own portfolio! I used Paybis's dedicated swap service and it was much simpler than I expected. Instead of dealing with traditional exchanges where you have to place separate buy/sell orders, their BTC to LTC swap handles everything in one step. You just enter how much Bitcoin you want to convert, they show you the exact Litecoin amount you'll receive with all fees included, and the swap happens automatically. The whole process took about 5 minutes and the Litecoin was in my wallet shortly after. Here's the link I used: paybis.com/swap-btc-to-ltc/
My crypto portfolio is heavily weighted toward Bitcoin, and I'm thinking about diversifying into some Litecoin. I've never actually swapped between cryptocurrencies before though. Is there a simple way to convert BTC to LTC without going through the whole process of selling to fiat and then buying again? I'd prefer something straightforward with clear fees.