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Base64 Encoder / Decoder

Encode or decode text, and convert files to Base64 Data URIs. Supports URL-safe encoding.

Input Text

Output

File → Base64 Data URI

Convert any file (image, PDF, etc.) to a Base64 Data URI — paste directly into CSS, HTML src attributes, or emails.

What is Base64?

Base64 is an encoding scheme that represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, + and /). It's used whenever binary content must travel through a text-only channel — email attachments (MIME), JSON payloads, HTML data: URIs, JWT tokens, basic HTTP authentication, and PEM-encoded certificates.

Base64 ≠ encryption

Base64 is not encryption. Anyone can decode it without a key. If you need secrecy, use real cryptography. Base64 is purely a transport/encoding convenience — it makes binary bytes safe for text channels that might otherwise mangle them.

Variants supported

  • Standard Base64 (RFC 4648 §4) — uses + and /. Default.
  • URL-safe Base64 (RFC 4648 §5) — swaps +- and /_ so the encoded string is safe inside URLs and filenames. Used by JWT, WebAuthn.
  • Padding stripped — JWT and some other specs omit trailing = characters.
  • 76-char wrap — the MIME/PEM format that line-wraps output at 76 characters.

Size overhead

Base64 expands data by ~33%. Every 3 bytes of input become 4 output characters, plus up to 2 bytes of padding. That's why inlining big images as Data URIs can bloat your HTML or CSS file — use data: URIs only for small icons, sprites, or tightly-coupled assets.

ABOUT THIS TOOL

What is Base64 Encoder / Decoder?

The Base64 Encoder / Decoder by D&D Technology is a powerful online tool designed for developers and tech enthusiasts. It allows users to effortlessly convert text and files into Base64 Data URIs and vice versa. This functionality is essential for ensuring seamless compatibility with various web applications, particularly where data needs to be embedded directly into HTML or CSS files. By using this tool, you can quickly encode your data for secure transmission or decode it for easy access and use.

Key benefits of our Base64 Encoder / Decoder include its user-friendly interface, fast processing speed, and the ability to handle both text and file inputs. Whether you are working on a web development project, need to encode images for an email, or require data to be sent over APIs, this tool simplifies the process. It supports URL-safe and MIME formats, making it versatile for various use cases.

This tool is ideal for startups, small businesses, enterprises, and developers who need a reliable solution for data encoding. It is particularly useful for eCommerce brands, SaaS founders, and agencies that require efficient data handling for their applications. With our Base64 Encoder / Decoder, you can improve your workflow and enhance your digital projects with ease.

At D&D Technology, we understand the challenges businesses face with data management and compatibility. Our Base64 Encoder / Decoder is part of our commitment to providing high-quality, free online tools that empower users to achieve their digital goals. Start using our tool today to streamline your data encoding and decoding processes.

Explore our services or contact us for a free consultation to learn more about how we can assist your business in achieving its digital transformation goals.

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