Base64 - Encode and Decode Base64 | Hexa

What Is Base64 and Why Developers Use It

Base64 is an encoding scheme that converts binary data into ASCII text using 64 printable characters (A–Z, a–z, 0–9, +, /). Why does this matter? Many systems—email, JSON, URLs, XML—only safely handle text. Binary data (images, files, encrypted content) can break these systems or get corrupted. Base64 solves this by turning binary into a safe text representation. A 1KB image becomes a ~1.3KB Base64 string that can be embedded in JSON, stored in a database, or sent over text-only channels. The trade-off: Base64 increases size by about 33%, but it enables compatibility where binary isn't allowed.

Common Uses for Base64 Encoding

Data URLs: Embed images directly in HTML or CSS. Instead of hosting an image file, you can use data:image/png;base64,iVBORw0KGgo... to inline the image. Useful for small icons, thumbnails, and single-file HTML exports.

APIs and JSON: Some APIs expect binary data as Base64 strings. File uploads, image processing, and document storage often use Base64 in request/response bodies.

Email attachments: MIME encoding uses Base64 to include binary attachments in plain-text email.

Configuration and secrets: Encoded certificates, keys, and config values sometimes appear as Base64 in config files.

How Base64 Encoding and Decoding Works

Base64 takes 3 bytes (24 bits) of binary data and represents them as 4 ASCII characters. Each character encodes 6 bits. The result is longer than the original but uses only safe characters. Our tool uses the browser's native btoa (encode) and atob (decode) APIs—or equivalent fallbacks—for fast, reliable conversion. See Base64 on Wikipedia and atob/btoa on MDN for technical details.

Privacy and Security

All encoding and decoding runs locally in your browser. We never see, store, or transmit your data. If you're encoding sensitive strings, API keys, or confidential content, rest assured it never leaves your device. The tool works fully offline—no server round-trips.

Using the Base64 Tool

Open the Base64 tool below. To encode: paste or type your text, then get the Base64 string. To decode: paste a Base64 string and get the original text. No signup required—instant encoding and decoding in your browser.