Base64 Encoder & Decoder

Base64 is a binary-to-text encoding scheme designed to represent binary data in an ASCII string format by translating it into a radix-64 representation. In early computer networking protocols, channels such as email (SMTP) were engineered exclusively for 7-bit US-ASCII transmission. Transmitting raw binary bytes like images, executable binaries, or compiled byte streams over these protocols frequently caused data corruption due to control characters and line-ending alterations. Base64 resolves this challenge by dividing binary data into 6-bit chunks, with each chunk mapped directly to one of 64 standard ASCII characters: uppercase letters A-Z, lowercase letters a-z, numerals 0-9, and the '+' and '/' symbols (with '=' serving as end-of-string padding). Today, Base64 is used extensively across web development: - **Data URLs:** Inlining small SVG graphics, favicons, or audio cues directly within HTML and CSS documents to eliminate extra HTTP requests. - **Authentication Tokens:** Formatting Basic Auth credentials (username:password) within HTTP authorization request headers. - **API Payloads:** Transmitting cryptographically signed signatures, public keys, and serialized binary blobs within JSON REST payloads. - **Email Attachments:** Standard MIME formatting for electronic mail attachments. Our Base64 converter supports modern UTF-8 multi-byte encoding (properly handling international glyphs, emojis, and extended alphabets without corruption) as well as file-to-DataURL conversion. All operations execute strictly client-side via native browser Web APIs, providing absolute privacy for your confidential keys, tokens, and documents.