Base64 Encoder Online

Encode text strings into Base64 format instantly. 100% private and free.

Input

Upload File

Output

Frequently Asked Questions

What is Base64 encoding?

Base64 converts binary or text data into a 64-character ASCII representation (A-Z, a-z, 0-9, +, /). It's used to safely transmit binary data through text-only channels like email, JSON payloads, HTML data URIs, and HTTP headers.

Who uses this tool professionally?

Developers encode API authentication credentials for HTTP Basic Auth headers. Email system administrators encode attachment data for MIME email formatting. Frontend developers create Base64 data URIs for embedding small images directly in CSS and HTML.

Does it handle binary data?

This tool encodes text strings to Base64. For binary file encoding (images, PDFs), the file should first be read as a binary buffer. The tool handles all UTF-8 text including international characters and special symbols.

Is my data kept private?

Yes. All encoding happens locally in your browser. Sensitive data like passwords and tokens are never transmitted to any server.

Base64 Encoder Online

Encode text strings into Base64 format instantly. 100% private and free.

Key Capabilities

Encodes both text and binary files

Handles plain text input and binary file upload. Text is encoded using UTF-8 by default.

URL-safe Base64 variant

The URL-safe variant replaces + and / with - and _, producing strings safe for URLs and JWT tokens.

Generates inline data URIs for images

Upload an image and the tool outputs a complete CSS-ready data URI.

How to Use

Choose input type and provide content

Select Text for encoding strings or File for encoding binary files.

Select encoding variant

Choose standard Base64 for most uses, or URL-safe Base64 for URLs and JWT tokens.

Copy the encoded output

Use the copy button. Line breaks are stripped automatically when copying.

Common Use Cases

Frontend developers embedding fonts in CSSA web developer can Base64-encode a custom icon font and insert it as a data URI in CSS.
API developers encoding authentication credentialsA developer can Base64-encode the username:password string for HTTP Basic Authentication headers.
Mobile developers encoding images for JSON payloadsA mobile app developer can encode an image file for a REST API that expects Base64 in JSON.

Frequently Asked Questions

What is Base64 encoding?

Who uses this tool professionally?

Does it handle binary data?

Is my data kept private?

Yes. All encoding happens locally in your browser. Sensitive data like passwords and tokens are never transmitted to any server.

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Developer Utilities — Data Format Conversion and Encoding

Understanding Data Serialization Formats

Software developers frequently work with structured data formats like JSON (JavaScript Object Notation), CSV (Comma-Separated Values), XML (Extensible Markup Language), and YAML (YAML Ain't Markup Language). Each format has different strengths: JSON is the standard for web APIs and configuration files. CSV is universally supported by spreadsheet applications. XML is used in enterprise systems and document formats. YAML is popular for human-readable configuration. Our conversion tools transform data between these formats instantly, handling edge cases like nested objects, special characters, and encoding differences.

Cryptographic Hash Functions

Hash functions like MD5, SHA-1, SHA-256, and SHA-512 convert any input data into a fixed-length string of characters called a hash or digest. These functions are one-way — you cannot reverse-engineer the original input from the hash. They are used for password storage, data integrity verification, digital signatures, and file deduplication. SHA-256 is the current standard for security-sensitive applications. MD5 and SHA-1 are considered cryptographically broken for security purposes but are still useful for checksums and non-security applications. All our hash generators run entirely in your browser — your data is never transmitted.

Text Encoding and Character Sets

Computers store text as numbers. ASCII maps 128 characters (English letters, digits, basic punctuation) to numbers 0-127. Unicode extends this to over 140,000 characters covering virtually every writing system on Earth. UTF-8 is the dominant encoding on the web, using 1-4 bytes per character. Base64 encoding converts binary data (like images or files) into a text-safe format using 64 printable ASCII characters. URL encoding replaces special characters with percent-encoded equivalents for safe transmission in web addresses. Our encoding tools handle all these transformations with proper error handling for malformed input.

Privacy for Developer Tools

All DoctorDocs developer tools process your data entirely in your browser using JavaScript. No API calls, no server uploads, no telemetry. This is critically important for developers working with sensitive data — API keys, database connection strings, configuration secrets, or proprietary code. When you paste a JSON payload to format it, or generate a SHA-256 hash of a password, the data exists only in your browser's memory. Close the tab and it is gone. This makes DoctorDocs developer tools safe to use with production data and secrets.