Base64 Encode & Decode Online – Free Online Tool
Encode and decode Base64 strings instantly online. Convert text to Base64, decode Base64 to text with full UTF-8 and emoji support. Free and fast.
Free Base64 Encoder & Decoder Online
Instantly encode text to Base64 or decode Base64 strings back to readable text. Our free Base64 encoder and decoder handles standard Base64 and URL-safe Base64 encoding, with full support for UTF-8 characters, emojis, and multi-byte strings. No signup, no limits — paste your data and get instant results.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts data into an ASCII string format using 64 characters (A-Z, a-z, 0-9, +, /). It is widely used in web development for embedding images in HTML/CSS (data URIs), encoding email attachments (MIME), transmitting binary data in JSON APIs, and storing credentials in configuration files.
UTF-8 & Emoji Support — No More Errors
Many basic Base64 encoders fail with UTF-8 characters, foreign languages, or emojis, producing 'URI malformed' or 'Invalid character' errors. Our tool properly handles the UTF-8 byte conversion before applying the Base64 algorithm, guaranteeing accurate encoding and decoding of any text in any language.
100% Private — Your Data Never Leaves Your Browser
Whether you are encoding proprietary JSON configurations, API keys, or sensitive data, everything stays on your device. This tool uses pure client-side JavaScript with no server requests, ensuring maximum privacy and instant results for developers working with sensitive information.
Common Base64 Use Cases for Developers
Base64 encoding is essential for embedding images as data URIs in HTML and CSS, transmitting binary data through JSON REST APIs, encoding email attachments via MIME, storing credentials in configuration files, and encoding query parameters for URL-safe transport. Our tool handles all these workflows with instant encoding and decoding.
Frequently Asked Questions
Everything you need to know about the Base64 Encode & Decode Online.
Is this Base64 tool free to use?
Yes, our Base64 encoder and decoder is completely free with no limits. Encode and decode as many strings as you need — there are no signup requirements, no rate limits, and no ads blocking your workflow.
Can I decode Base64 strings with emojis and special characters?
Yes. Our decoder fully supports UTF-8 encoding, so any string containing emojis, accented characters, Asian scripts, mathematical symbols, or other multi-byte characters will be encoded and decoded perfectly.
Is this tool safe for encoding API keys and passwords?
Yes. All encoding and decoding happens directly in your web browser using client-side JavaScript. No data is ever sent to any server, making it completely safe for sensitive credentials, tokens, and configuration data.
Why do I get an 'Invalid Base64' error?
Base64 strings must have a length that is a multiple of 4 and typically end with one or two '=' padding characters. If your string is incomplete, truncated, or contains characters outside the standard Base64 alphabet (A-Z, a-z, 0-9, +, /), the decoder cannot process it.
What is the difference between standard Base64 and URL-safe Base64?
Standard Base64 uses '+' and '/' characters which have special meaning in URLs. URL-safe Base64 replaces these with '-' and '_' respectively, making the encoded string safe for use in URLs, query parameters, and filenames without additional encoding.
Can I convert files (images, PDFs) to Base64?
Yes! Use the File upload button or drag-and-drop a file onto the input area. The tool reads the file, converts it to Base64, and also generates a Data URI that you can use directly in HTML img tags or CSS background-image properties.