ERC-20 vs ERC-721 vs ERC-1155: Ethereum Token Standards Explained
Ethereum supports many different types of digital assets, but not every token is designed to behave in the same way. A fungible cryptocurrency-style token, a unique NFT and a game containing hundreds of different digital items require different technical structures.
Three of the most important Ethereum token standards are ERC-20, ERC-721 and ERC-1155.
ERC-20 is primarily used for fungible assets. ERC-721 is designed around individually identifiable tokens, while ERC-1155 provides a more flexible architecture capable of managing multiple token types within the same contract system.
ERC-20 vs ERC-721 vs ERC-1155 at a Glance
| Feature | ERC-20 | ERC-721 | ERC-1155 |
|---|---|---|---|
| Asset Type | Fungible | Non-fungible | Multi-token |
| Individual Units | Generally interchangeable | Individually identifiable | Can represent multiple asset classes |
| Typical Use | Utility and governance tokens | NFTs and unique digital assets | Games, collections and mixed asset systems |
| Multiple Token Types in One Contract | No | Usually one collection structure | Yes |
| Batch Transfers | Not part of the basic model | Not the main design | Supported by the standard |
What Is ERC-20?
ERC-20 is the best-known Ethereum standard for fungible tokens.
Fungible means that individual units of the same asset are generally interchangeable. If two users each own one unit of the same standard ERC-20 token, those units normally represent the same type of asset.
This makes ERC-20 suitable for systems where balances matter more than unique token identities.
Typical applications include utility tokens, governance assets, application currencies and other digital units intended to be interchangeable.
ERC-20 defines a common interface containing functions for operations such as transfers, balance queries and allowances.
For a deeper explanation, see
What Is an ERC-20 Token and How Does It Work?.
What Is ERC-721?
ERC-721 is designed for non-fungible tokens.
Unlike ERC-20 balances, each ERC-721 token can have its own individual token identifier.
This makes it possible to distinguish one asset from another even when both belong to the same collection.
| Example | Why ERC-721 Fits |
|---|---|
| Digital collectible | Each item can have a unique token ID |
| Game character | Different characters can represent different assets |
| Membership asset | Each membership can be individually tracked |
| Tokenized certificate | Each record can represent a distinct item |
ERC-721 became closely associated with NFTs because it provides a standardized way to represent individually identifiable digital assets.
What Is ERC-1155?
ERC-1155 takes a different approach by allowing a single contract architecture to manage multiple token types.
Those assets can represent fungible units, non-fungible items or combinations of both.
This makes ERC-1155 particularly useful for applications containing many different classes of assets.
A blockchain game, for example, could theoretically use one ERC-1155 contract to represent currencies, weapons, resources, tickets and unique items instead of deploying a separate contract for every asset category.
The Main Difference: Fungibility
The most important distinction between these standards is how they treat individual units.
| Standard | How Units Behave |
|---|---|
| ERC-20 | Units of the same token are intended to be interchangeable |
| ERC-721 | Each token has its own identifiable token ID |
| ERC-1155 | One contract can manage multiple IDs representing different asset types |
A Simple Example
Imagine a blockchain game with three types of assets:
- A gold currency used by every player.
- Unique legendary characters.
- Thousands of weapons, materials and collectible items.
The project could potentially structure those assets in several ways.
| Asset | Possible Standard | Reason |
|---|---|---|
| Gold | ERC-20 | Every unit of gold is interchangeable |
| Legendary Character | ERC-721 | Each character can be individually unique |
| Large inventory system | ERC-1155 | Many different asset types can be managed through one contract architecture |
ERC-20: Best for Fungible Assets
ERC-20 remains the natural choice when a project needs a conventional fungible token.
Examples include assets where users care about how many units they own rather than which specific units they hold.
A balance of 500 tokens is generally represented as a quantity associated with an address.
The contract does not need to distinguish token number 1 from token number 2 because the units are intended to be equivalent.
ERC-721: Best for Individual Ownership
ERC-721 introduces token IDs that make individual assets distinguishable.
For example, token ID 101 and token ID 102 can belong to the same collection while representing completely different items.
Each token can also be associated with metadata describing the underlying digital asset.
This structure is useful when ownership of one specific item matters more than ownership of a general balance.
ERC-1155: Best for Complex Asset Systems
ERC-1155 can be more efficient for applications that need to manage many different assets.
Instead of deploying completely separate contracts for every asset type, one contract can track multiple token IDs.
Some IDs may represent fungible assets with many interchangeable units, while others can represent assets with much smaller supplies.
The standard also supports batch operations, allowing multiple token types to be transferred within a single interaction.
Token Identification Works Differently
| Standard | How an Asset Is Identified |
|---|---|
| ERC-20 | Contract address + account balance |
| ERC-721 | Contract address + unique token ID |
| ERC-1155 | Contract address + token ID + quantity |
This distinction affects how wallets, marketplaces and applications display and manage the assets.
ERC-20 vs ERC-721
ERC-20 and ERC-721 solve two fundamentally different problems.
ERC-20 asks: how many units does this address own?
ERC-721 asks: which specific token does this address own?
| Feature | ERC-20 | ERC-721 |
|---|---|---|
| Balances | Primary ownership model | Ownership tracked by token ID |
| Unique Items | Not the intended use | Yes |
| Fractional Quantities | Commonly supported through decimals | Each token is normally an individual unit |
| Typical Asset | Fungible token | NFT |
ERC-721 vs ERC-1155
Both standards can represent individually distinguishable assets, but their architectures are different.
ERC-721 focuses on individually identifiable tokens within a collection.
ERC-1155 is designed to manage many different token IDs and quantities through one contract architecture, making it useful for larger mixed-asset environments.
| Feature | ERC-721 | ERC-1155 |
|---|---|---|
| Unique Token IDs | Yes | Yes |
| Fungible Asset Types | Not its primary purpose | Supported |
| Multiple Asset Classes | More collection-oriented | Designed for multiple token types |
| Batch Transfers | Not a core feature | Yes |
Which Standard Is More Efficient?
There is no universal answer because efficiency depends on the application.
For a straightforward fungible token, ERC-20 is simpler and widely supported.
For a collection of individually identifiable assets, ERC-721 provides a clear and familiar structure.
For applications managing many asset categories, ERC-1155 can reduce the need to deploy numerous separate contracts and can make batch operations more practical.
The best architecture is therefore the one that matches the actual requirements of the project.
Can One Project Use Multiple Standards?
Yes. A project does not have to choose one token standard for its entire ecosystem.
For example, a platform could use an ERC-20 token for governance while using ERC-721 assets for memberships or collectibles.
Another project could use ERC-1155 for a large inventory system while maintaining a separate ERC-20 utility asset.
Different smart contracts can interact with one another when the application is designed to support that architecture.
Security Considerations
Choosing a standard does not eliminate smart contract risk.
Projects still need to consider access control, minting permissions, transfer logic, contract ownership and any custom functionality added on top of the standard implementation.
ERC-1155 systems can also introduce additional application complexity because one contract may manage many different asset types.
The more custom logic a project introduces, the more important testing and security review become.
Which Standard Should You Choose?
| If Your Project Needs… | Consider |
|---|---|
| A cryptocurrency-style fungible token | ERC-20 |
| A collection of individually unique assets | ERC-721 |
| A complex game inventory | ERC-1155 |
| Many asset types managed through one contract | ERC-1155 |
| A governance or utility asset | ERC-20 |
| Unique membership or ownership records | ERC-721 |
This table is a starting point rather than a universal rule. Contract architecture should ultimately be based on technical requirements.
How Token Standards Connect to Smart Contracts
ERC-20, ERC-721 and ERC-1155 are not separate blockchains. They are standards implemented through smart contracts running on Ethereum.
Ethereum provides the underlying blockchain and execution environment, while the contract defines how the token behaves.
If you are new to this architecture, read
How Ethereum Smart Contracts Work
before moving deeper into token development.
From Choosing a Standard to Building a Token
Selecting the correct standard is only the first step.
Developers also need to define supply, ownership, permissions, metadata and any additional functionality before testing the contract.
For practical ERC-20 development, see
How to Create an Ethereum Token: From Idea to Smart Contract.
The
EtherFree Ethereum Token Creation Course
also provides a structured path from token standards and smart contract fundamentals to testing and deployment preparation.
Final Thoughts
ERC-20, ERC-721 and ERC-1155 solve different problems inside the Ethereum ecosystem.
ERC-20 is designed for fungible assets, ERC-721 for individually identifiable tokens, and ERC-1155 for systems that need to manage multiple token types efficiently.
None of the standards is universally better than the others. The correct choice depends on what the asset represents and how users are expected to interact with it.
Understanding that difference before writing a contract can prevent unnecessary complexity later in the development process.
Questions and Answers About Ethereum Token Standards
What is the main difference between ERC-20 and ERC-721?
ERC-20 represents fungible assets where units are generally interchangeable. ERC-721 represents individually identifiable tokens with unique token IDs.
Can ERC-1155 support both fungible and non-fungible assets?
ERC-1155 is designed to support multiple token IDs and quantities within one contract architecture, making it suitable for both fungible-style and individually limited asset types.
Which standard is best for a normal cryptocurrency token?
ERC-20 is generally the most appropriate of these three standards for a conventional fungible token.
Which standard is commonly used for NFTs?
ERC-721 is one of the best-known standards for individually identifiable NFTs, although ERC-1155 can also be used for NFT-style assets.
Why would a project use ERC-1155?
ERC-1155 can be useful when a project needs many different asset types and wants to manage them through a more consolidated contract architecture.
Can a project use ERC-20 and ERC-721 together?
Yes. Different token standards can be used by different smart contracts within the same application ecosystem.
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