Base64 Encoder & Decoder

Base64 encoding converts binary data into a text format using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is commonly used to embed images directly in HTML or CSS, transmit binary data through text-only channels like email (MIME) or JSON APIs, encode authentication credentials (e.g., HTTP Basic Auth), and store binary data in databases or configuration files that only support text.

Standard Base64 uses the characters +, /, and = which have special meanings in URLs and can cause issues in query parameters or filenames. URL-safe Base64 replaces + with -, / with _, and removes trailing = padding. Use URL-safe encoding when the Base64 string will appear in URLs, filenames, or any context where +, /, and = characters might be misinterpreted.

Yes. Base64 encoding increases data size by approximately 33%. Every 3 bytes of original data become 4 bytes of Base64 text. For example, a 1 KB file becomes roughly 1.33 KB when Base64-encoded. This trade-off is generally acceptable for small assets like icons or thumbnails, but for large files it is more efficient to serve them as binary and reference them via URL.

Yes, it is completely secure. All encoding and decoding happens directly in your browser using JavaScript. No data is ever sent to a server. Your text, images, and Base64 strings stay on your device, making this tool safe for encoding sensitive data like API keys, tokens, or confidential documents.

Beyond this free Base64 tool, Dewx is an AI-powered business operating system that unifies your communication channels and automates workflows. If you work with APIs, webhooks, or integrations that require Base64-encoded data, Dewx can help you manage those integrations from a single dashboard alongside your CRM, inbox, and outreach automation.