Base64 Encoder

Encode text and files to Base64

Base64 turns binary data into plain text made of letters, numbers and a couple of symbols - the trick that lets you embed an image in a CSS file, put a file inside a JSON payload, or send a small attachment through a text-only channel. Paste text or drop a file and get the Base64 string instantly, decoded just as easily in the other direction. It runs in your browser, so tokens, keys and private files you encode are never transmitted anywhere.

Where Base64 shows up

Data URIs (data:image/png;base64,…) inline small images and fonts straight into HTML and CSS, saving a network request. APIs use Base64 to carry binary blobs inside JSON, which is text-only by nature. Basic HTTP auth Base64-encodes credentials; email attachments have used it for decades. And JWTs are three Base64url-encoded segments - our JWT Decoder unpacks those specifically.

One important caveat: Base64 is encoding, not encryption. It's trivially reversible and provides zero security - anyone can decode it. To actually protect data, use our Text Encryptor or File Encryptor, which apply real AES-256 encryption.

Standard vs. URL-safe Base64

Standard Base64 uses + and / characters, which have special meanings in URLs and filenames. URL-safe Base64 (Base64url) swaps them for - and _ so the string can travel in a query parameter or path without escaping - it's what JWTs and many APIs use. Encoding a file inflates its size by about a third, which is why Base64 is meant for small assets; a large image is better linked than inlined. For turning Base64 image data back into a downloadable file, pair this with the matching decoder.