Base64 Encoder/Decoder
Encode and decode Base64 strings and files. Runs entirely in your browser for privacy.
📝 Text to Encode
📁 Upload File
Drag and drop a file here, or click to browse
Supports images, documents, and any other file type
📤 Output
Preview
✨ Features
Encode & Decode
Convert text to Base64 and back
File to Base64
Convert any file to Base64 string
Data URI Support
Generate complete data URIs for images
URL-Safe Mode
Generate URL-safe Base64 strings
Image Preview
Preview encoded images instantly
100% Private
All processing in your browser
💡 Example Use Cases
Embedding Images in CSS/HTML
Convert small images to data URIs for inline embedding, reducing HTTP requests.
API Authentication
Encode credentials for Basic Authentication headers in API requests.
Email Attachments
Encode files for MIME email attachments or debug encoded email content.
JWT Debugging
Decode Base64-encoded JWT tokens to inspect headers and payloads.
Frequently Asked Questions
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters. It's commonly used to embed binary data in text-based formats like JSON, XML, or HTML.
Common uses include encoding images for data URLs, transmitting binary data over text-only protocols, storing complex data in cookies, and encoding authentication credentials.
No, Base64 is encoding, not encryption. Anyone can decode Base64 data. It's meant for data representation, not security. Use proper encryption for sensitive data.
Base64 encoding increases size by approximately 33% because it represents binary data using a limited set of ASCII characters, requiring more characters to represent the same data.
Yes, you can upload files to convert them to Base64 strings. This is useful for embedding images directly in HTML or CSS, or for transmitting files via APIs.
Free Online Base64 Encoder and Decoder
Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. Our tool provides instant Base64 encoding and decoding for text and files, all processed locally in your browser for complete privacy.
What is Base64 Encoding?
Base64 encoding converts binary data into a sequence of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). This makes it safe to transmit binary data through text-only systems like email or embed binary data in HTML, CSS, or JSON.
Common Base64 Use Cases
Developers frequently use Base64 for embedding images as data URIs, encoding API authentication credentials, transmitting binary files over text protocols, and encoding special characters in URLs. Our tool handles all these scenarios with options for data URI prefixes and URL-safe encoding.
URL-Safe Base64
Standard Base64 uses + and / characters which have special meaning in URLs. URL-safe Base64 replaces these with - and _, making the encoded string safe for use in URL parameters and file names.