Base64 Encoder
Encode text to Base64 — locally in your browser.
Tool
Paste your input and get output instantly. Everything stays in your browser.
Ready
What the tool does
The Base64 Encoder converts plain text into Base64 format directly in your browser. Base64 encoding is commonly used to safely transmit text data through systems that only support ASCII characters, such as HTTP headers, JSON payloads, or environment variables.
When to use it
Use this tool when you need to encode strings for APIs, embed text in configuration files, prepare credentials for authorization headers, or debug encoded payloads. It's especially useful when working with authentication tokens, webhooks, or data that must survive transport without breaking formatting.
Quick example
You paste the text hello_world and instantly get aGVsbG9fd29ybGQ=. No setup, no uploads, no extra steps.
Security / privacy
All encoding happens 100% locally in your browser. Your text is never sent to a server, logged, stored, or analyzed. This makes it safe for sensitive strings such as secrets, API keys, internal identifiers, or private messages. Unlike many online encoders, ExtraTools.dev guarantees zero tracking and zero data exposure.