Address Conversion

IoTeX Address format
While IoTeX is fully compatible with Ethereum, you should always remember that IoTeX and Ethereum are two distinct networks: you must pay a little attention to some small differences when using Web3 tools with IoTeX. One difference is in the wallet address representation: even though IoTeX and Ethereum use the same cryptography for transaction signatures, IoTeX defines its own wallet address representation format, which is different from the Ethereum representation.
Let's look at an example, consider the following private key:

7fda34c8319534253619f69604ffbd43e315e319b84c03ea4f19e1a0e439a4b1
given that private key, using elliptic curve cryptography we can derive the corresponding public key:

04ba460edf45c8855cccdec55583972dc9aaaee24513db5b4a1dc110b4a7af095a055a38ae679d178ec8cb3ed855aa2d6d23791b1c51eefc19a6da6ae4191cca80
Now, since blockchain addresses are fundamentally just a "compact" representation of the public key, derived from it by applying a few transformations, the public key above becomes the following "0x..." address in Ethereum:
0x95E20FD5FDd9A8D9D174C7fAE7c3F9eC51BBbF36
and the following "io1..." address in IoTeX:
io1jh3ql40amx5dn5t5claw0slea3gmh0ek8flwlp
Both these addresses are nothing more than a different way of representing the same public key, and ultimately they belong to the same private key. 
Depending on which tool you are using for interacting with the IoTeX blockchain, you may have to convert between the IoTeX representation and the Ethereum representation of the same account: Ethereum tools like Metamask or Truffle and libraries like Web3js as well as Solidity compilers expect addresses written the "0x..." Ethereum format. On the other hand, IoTeX tools like the ioPay wallet or the iotex-antenna native SDK expect addresses written in the "io1..." IoTeX format or they may accept both formats for the address.
Please notice: You should not get confused between the actual wallet account and its address representation: while you can represent a wallet public address in different ways, a wallet account is uniquely identified with its private key and the actual blockchain network you are interacting with your wallet or tool. 
So, as it's for any other Ethereum compatible chain, if your wallet is configured to interact with the IoTeX blockchain (i.e., the RPC endpoint is set to IoTeX), it doens't matter the address representation you use: you will always be sending tokens from an IoTeX blockchain account to another IoTeX Blockchain account.
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Address conversion and tools
Whenever it's required, you can convert between the two address representations at any time: you have many options to do that, let's see some:
Command-line
On macOs and Linux, you can install the IoTeX official command-line client ioctl and use the ioctl account ethaddr command to convert any address between Ethereum and IoTeX representations.
Address Conversion
Web tools
You can use the official IoTeX web tools page to convert your address: just input your address in whatever format, and you will get the other representation:
Delegates
IoTeX Address Conversion Tool
Other similar tools have been developed by the community that provides the same functionality, like the following one:
https://iotexlab.io/eth2io
Community Address Conversion Tool
NodeJS package
If you are a javascript developer, you can easily integrate the address conversion functionality into your application by installing the following nodejs package:
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# If using npm package manager
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$ npm i @iotexproject/iotex-address-ts
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# If using yarn package manager
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$ yarn add @iotexproject/iotex-address-ts
Copied!
then import it in your code with:
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import { from } from "@iotexproject/iotex-address-ts";
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​
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const addr = from("0xb8744ae4032be5e5ef9fab94ee9c3bf38d5d2ae0");
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console.log(addr.string());
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// io1hp6y4eqr90j7tmul4w2wa8pm7wx462hq0mg4tw
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console.log(addr.stringEth());
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// 0xb8744ae4032be5e5ef9fab94ee9c3bf38d5d2ae0
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​
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const addr2 = from("io1hp6y4eqr90j7tmul4w2wa8pm7wx462hq0mg4tw");
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console.log(addr2.string());
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// io1hp6y4eqr90j7tmul4w2wa8pm7wx462hq0mg4tw
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console.log(addr2.stringEth());
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// 0xb8744ae4032be5e5ef9fab94ee9c3bf38d5d2ae0
Copied!
check out the GitHub repository here:
GitHub - iotexproject/iotex-address-ts
GitHub
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Contents

IoTeX Address format

Address conversion and tools

Command-line

Web tools

NodeJS package