AnyTools
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Base64 String Converter
Convert between text strings and Base64 encoding with URL-safe support
Convert between text strings and Base64 encoding with URL-safe support
Convert between text strings and Base64 encoding. Supports URL-safe Base64 encoding and decoding. Handles Unicode characters and data URLs automatically.
String to Base64
Encode URL Safe
String to Encode
Base64 of String
Base64 to String
Decode URL-safe
Base64 String to Decode
Decoded String
Important Notes
Base64 encoding increases text size by approximately 33%. All processing is performed locally in your browser for maximum privacy and security.
❓What is Base64 String Converter
Base64 String Converter is a tool for encoding text to Base64 or decoding Base64 to text. Base64 is a method of encoding binary data into text representation using 64 ASCII characters (A-Z, a-z, 0-9, +, /). Key features: Bidirectional text ↔ Base64 conversion, URL-safe Base64 support (+ → -, / → _), Real-time encoding/decoding, Syntax validation, One-click copy. How it works: Each 3 bytes (24 bits) are converted to 4 Base64 characters (6 bits each). If not divisible by 3, padding with '=' is added. Example: 'Hello' → 'SGVsbG8='. Size increase: ~33% (3 bytes → 4 characters). Use cases: Email attachments (MIME encoding), HTTP Basic Authentication (encode username:password), Data URIs (embed images in HTML), API tokens and credentials, Binary data in JSON payloads, Cookies and local storage, JWT tokens (header and payload). Security note: Base64 is NOT encryption - anyone can decode it. It provides obfuscation, not security. Use proper encryption for sensitive data. This tool processes locally in your browser without uploading data to any server.
✨Features
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Bidirectional Conversion
Convert text to Base64 or Base64 to text
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URL-Safe Mode
URL-safe Base64 encoding support (+, / → -, _)
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Real-time Processing
Automatic conversion as you type
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One-Click Copy
Copy result to clipboard with one click
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Use Cases
DATA
Data format preparation
Use Base64 String Converter when you need to prepare input data for imports, exports, migrations, reports, or handoff between systems.
DEV
Developer debugging
Convert or inspect values with Base64 String Converter while testing APIs, validating payloads, reviewing copied data, or reproducing format issues in development.
DOC
Documentation and examples
Create clean examples with Base64 String Converter for README files, tickets, support notes, tutorials, and internal technical documentation.
📋Usage Guide
Input Text or Base64
Enter text string or Base64 string
Choose Direction
Select conversion direction
Convert and Copy
Convert and copy result to clipboard
📚Technical Introduction
🔤Text Encoding and Base64 Transformation
Base64 string conversion encodes text into Base64 format or decodes Base64 back to readable text. The process involves character encoding transformation: converting text to UTF-8 bytes, applying Base64 encoding (grouping 3 bytes into 4 base64 characters), and handling character set encoding. Unlike file Base64 encoding, string conversion focuses on text data, handling various text encodings (UTF-8, UTF-16, ASCII, ISO-8859-1), emoji and
⚙️Character Set Handling and Unicode Support
The converter implements comprehensive Unicode support through UTF-8 encoding as the standard character set. It handles Unicode normalization (NFC, NFD, NFKC, NFKD) for proper character comparison and storage, surrogate pairs for characters outside Basic Multilingual Plane (BMP), combining diacritical marks, zero-width characters (ZWSP, ZWNJ, ZWJ), and right-to-left marks. The tool manages encoding edge cases: invalid UTF-8 sequences with
💡Data URI Generation and Application Scenarios
The converter generates data URIs (data:text/plain;base64,encoded_text) suitable for embedding text in HTML/CSS/JavaScript. Common use cases include: embedding configuration data in single-file HTML, storing credentials in environment variables (API keys, tokens), passing text data in URLs without query parameters, and creating self-contained email templates. The tool supports MIME type specification for different text formats: text/plain for reg
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Frequently Asked Questions
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What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII text format using 64 characters (A-Z, a-z, 0-9, +, /). It's commonly used for data transmission and storage.
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Why use Base64 encoding?
Base64 encoding is used to transmit binary data over text-based protocols (email, JSON, XML), embed images/files in HTML/CSS, store data in databases, and ensure data integrity during transmission.
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What is URL-safe Base64?
URL-safe Base64 replaces + and / with - and _ respectively, making it safe for use in URLs without encoding. This prevents conflicts with URL special characters.
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Does Base64 encoding compress data?
No, Base64 encoding increases data size by approximately 33%. It's for encoding, not compression. Use compression algorithms before Base64 encoding if size reduction is needed.
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Can I encode Unicode characters?
Yes, this tool supports all Unicode characters including emojis and special characters. It uses UTF-8 encoding to handle Unicode properly before Base64 conversion.
💡How to Use
1️⃣
Encode Text to Base64
Enter text and click 'Encode' button. Copy result for API, email, or data storage. Use URL-safe mode for URLs.
2️⃣
Decode Base64 to Text
Paste Base64 string and click 'Decode' button. Tool automatically detects URL-safe mode and converts to readable text.
3️⃣
Handle Unicode Characters
Tool supports all Unicode characters including emojis. Automatically handles character encoding for proper conversion.
4️⃣
Generate Data URI
Use encoded Base64 to create data URI (data:text/plain;base64,...) for embedding in HTML/CSS.
5️⃣
Copy and Use
Click copy button to copy result. Use in API requests, config files, or data transmission.
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