Blockchain.info allows you to look at the raw hex of a transaction. But it doesn't have testnet functionality. Blockexplorer allows you to look at testnet, but I can't find a way to show the hex dump.
Any solutions?
Maybe too late, but here's an example of using Blockr.io on testnet with raw hex dump:
http://tbtc.blockr.io/api/v1/tx/raw/5bb4f41ad7ac687db5126cb66a4971100f4137a3056d85ee27343ce429dbe4bb
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1Blockr isn't available after Coinbase acquired it. Try this: testnet.smartbit.com.au/tx/… – mixdev Sep 12 '17 at 12:00
Here is a functioning Testnet Tx Hex decoder https://live.blockcypher.com/btc-testnet/decodetx/
You can also get raw transaction on bitaps.com testent explorer
