Remix IDE Cheatsheet

Overview

Use this Remix IDE reference while you build software engineering projects, review code for technical interview prep, or polish examples for a software engineer resume.

What is Remix IDE

Remix IDE is a browser-based Solidity development environment. No install required — open the URL and start writing contracts. It handles compilation, deployment, interaction, debugging, and testing in one place.

Remix is continuously deployed — remix.ethereum.org always serves the current release; there is no version to install or update. New Solidity compiler releases show up in the compiler dropdown as they ship.

Panel Layout

Panel	Location	Purpose
Icon Bar	Far left	Switch between plugins (File Explorer, Compiler, Deploy, etc.)
Side Panel	Left	Active plugin UI
Editor	Center	Source code with syntax highlighting + inline errors
Terminal	Bottom	Transaction logs, console output, test results
Status Bar	Bottom edge	Workspace + Git branch, notifications, AI assistant status

Keyboard Shortcuts

Remix defines only a handful of app-level shortcuts:

Action	Shortcut
Compile current file	`Ctrl+S` / `Cmd+S`
Compile file and run the open script	`Ctrl+Shift+S`
Open File Explorer	`Ctrl+Shift+F`
Open Plugin Manager	`Ctrl+Shift+A`
Format current file	`Ctrl+Alt+F`

The editor itself is Monaco (VS Code's editor), so standard editor bindings work inside it: Ctrl+F find, Ctrl+/ toggle comment, F12 go to definition, F1 editor command palette.

Core Workflow

Write — author .sol files in the File Explorer.
Compile — Solidity Compiler plugin compiles on save or manually.
Deploy — Deploy & Run plugin sends the constructor transaction.
Interact — Call functions directly from the deployed contract panel.
Debug — Step through failed transactions in the Debugger plugin.

Workspaces

Remix organizes files into workspaces (isolated virtual filesystems stored in browser localStorage or connected to GitHub/IPFS).

Create: File Explorer → Workspaces dropdown → Create.
Switch: dropdown at the top of the File Explorer.
Clone from GitHub: Workspaces → Clone Git Repository (requires GitHub plugin or URL).

Workspaces persist in localStorage — use File → Save to disk or GitHub sync for backups. Clearing browser storage wipes local workspaces.

File Types Remix Understands

Extension	Treatment
`.sol`	Solidity source — compiled by the Solidity Compiler plugin
`.vy`	Vyper source — requires Vyper plugin
`.json`	ABI / artifact files, displayed as JSON
`.ts` / `.js`	Scripts run via Remix Script Runner (Hardhat-compatible)
`.test.js`	Mocha unit tests (Remix tests plugin or Script Runner)
`_test.sol`	Solidity unit tests (SolidityUnitTesting plugin)

Quick-Start: Hello World

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract Hello {
    string public greeting = "Hello, Remix!";

    function setGreeting(string calldata _g) external {
        greeting = _g;
    }
}

Paste into contracts/Hello.sol.
Press Ctrl+S — green checkmark = compiled.
Open Deploy & Run (rocket icon) → Deploy.
Expand the deployed contract, click greeting — returns "Hello, Remix!".