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I've personally used walletgenerator.net many of times and stored decent amounts of coin (some Bitcoin, some Altcoins) on wallets generated by that site. If you want to go the extra mile (which I highly recommend) you can also download the site and run it offline, effectively guaranteeing that youre safe from any code that sends the websites owner your private key. And, as an added bonus, you can use that site to create a fair number of altcoin wallets too.
WalletGenorator.netDownload via GitHub