Base64 Encoder
Encode it. Done.
Free Tool — No Login RequiredImage Encoding
Want to encode an image to Base64?
Use our dedicated Image to Base64 Encoder tool for JPG, PNG, SVG, GIF and WebP.
Base64 Decoding
Need to decode a Base64 string back to text?
Use our dedicated Base64 Decoder tool for instant, browser-based decoding.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into a sequence of printable ASCII characters using 64 symbols (A–Z, a–z, 0–9, +, /). It is widely used in web development for embedding images directly in HTML or CSS, transmitting binary data through text-based protocols like email (MIME), storing complex data in JSON or XML, and securing data during API communication. Every 3 bytes of binary data become 4 Base64 characters, making the output approximately 33% larger than the original.
Why Use CodeZiper's Base64 Encoder?
- Encode and decode text, URLs, and files in one tool
- URL-safe Base64 mode (Base64URL / RFC 4648) for APIs and URLs
- Encode images to Base64 Data URI for direct HTML/CSS embedding
- Live mode for instant encoding as you type
- Line-by-line encoding and MIME 76-char chunk splitting
- Full Unicode support — handles all languages and special characters
- 100% browser-based — your data never leaves your device
- No signup, no login, completely free
Common Use Cases
API & JWT Development
Encode authentication credentials, API tokens, and JWT payloads to Base64 for secure transmission through HTTP headers and REST APIs.
Embed Images in HTML & CSS
Convert small icons, logos, and UI images to Base64 Data URIs to embed them directly in your HTML or CSS files, eliminating extra HTTP requests.
Email & MIME Encoding
Encode attachments and binary content for email transmission using MIME-compliant Base64 formatting with 76-character line chunks.
Base64 FAQ
Common questions about this tool.
Standard Base64 uses + and / characters which are unsafe in URLs. URL-safe Base64 (Base64URL, RFC 4648) replaces + with - and / with _, and removes = padding, making the output safe to use in URLs and filenames without percent-encoding.
No. All encoding and decoding happens entirely in your browser using JavaScript's built-in btoa() and atob() functions. Nothing is transmitted to any server.
Yes. Use the image encoder section below the main tool to upload .jpg, .png, .gif, .svg, or .webp files and get a Base64 Data URI instantly.
The = signs are padding characters. Base64 encodes data in groups of 3 bytes. If the input length is not a multiple of 3, = padding is added to make the output length a multiple of 4.
It works well for text files and small images (under 2MB). Very large binary files may slow down the browser since everything runs client-side.