There are a lot of online exchangers recommended by users. Each of the exchangers has its own exchange conditions and exchange rates may differ.
To make it easier for you to make a choice, use the search on BestChange . Here is collected information from more than 440 online exchangers and you can quickly see the offers of different exchangers for exchanging monero to bitcoin https://www.bestchange.com/monero-to-bitcoin.html or other currency pairs