Base64 Encode &
Decode Binary Data
Encode UTF-8 strings or raw files to Base64 headers instantly. Decode data URIs back to downloads. Everything compiles inside your browser memory securely.
0
Input Chars
0
Input Bytes
0
Output Chars
0
Output Bytes
Load Common base64 Presets
Click any card to instantly populate the coding dashboard panels.
Simple 4-Step Process
Paste or Drag
Paste your text/base64 string, or drop any file directly into the input window.
Choose Action
Toggle between encoding raw formats to base64, or decoding them back.
Process Data
The tool compiles binary mapping translations locally in browser memory.
Export Result
Copy the resulting string, or download the compiled binary file directly.
Designed For Web Architectures
API Authentication
Encode username/password parameters safely for HTTP Basic authorization headers.
Embed Data URIs
Convert small icons, SVGs, or files into inline Base64 data strings for HTML/CSS pages.
JWT Inspection
Decode structural payloads of JSON Web Tokens to troubleshoot scopes and keys.
Binary Serialization
Map binary assets into readable JSON payloads safely for web transports.
Premium Capabilities
File Upload & Conversion
Convert PDFs, images, or documents to base64 simply by dragging them into the panel.
Binary Exporter
Decode standard base64 strings back to binary files and download them automatically.
Safe Data URI Format
Automatically wraps files in standard HTML/CSS data URI prefix syntax.
100% Client-Side
Runs completely in-browser. Your proprietary keys or files are never sent across the web.
Offline Ready
Perform coding transactions even when disconnected from internet links.
UTF-8 Compliant
Supports complex unicode characters, accents, and emojis without parsing errors.
Related Utilities
JSON Formatter
Validate, beautify & inspect JSON schemas instantly.
Open DeveloperURL Encoder
Encode and decode URL parameters safely.
Open DeveloperDiff Checker
Compare text and code files side-by-side easily.
Open SecurityHash Generator
Generate secure MD5, SHA-1, and SHA-256 strings.
OpenBase64 & Binary Coding Guides
What is Base64?
Understand the standard 64-character binary-to-text mapping serialization scheme.
Read Guide →Using Data URIs In CSS
Learn how base64 data strings reduce browser HTTP requests inside production stylesheets.
Read Guide →Security of Base64 Coding
A warning guide explaining why Base64 encoding is not encryption or secure hashing.
Read Guide →Frequently Asked Questions
Base64 encoding translates binary data into readable ASCII characters. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent binary variables safely without network payload breaking.
No. Base64 is a simple encoding scheme, not encryption. Anyone can decode a base64 string back to its original representation in milliseconds without keys. Never store secrets in plain base64 format.
Since files are processed entirely in browser memory, we recommend keeping file uploads below 10MB to prevent browser tab freezing or lag.
Need More Developer Utilities?
Explore our entire catalogue of free tools designed to simplify your everyday coding workflows.