Advanced Base64 Encoder & Decoder Online

Base64 is a binary-to-text encoding scheme that converts data into 64 printable ASCII characters. Developers use it for API payloads, embedding images as Data URIs, creating JWT authentication tokens, encoding email attachments via MIME, and safely transmitting binary data in text-based formats like JSON, XML, and HTML.

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  • No Server Upload
  • Real-Time
  • JWT Viewer
  • Works Offline
B64
UTF-8
JWT
Input
Drop text or file here
0 chars · 0 bytes
Output
0 chars · 0 bytes

Encoding Visualizer

Visual breakdown of Base64 character classes in the output.

Encode something to see the visualization.
A Uppercase a Lowercase 0 Digit + Special = Padding

Multi-Layer Decoder

Decode repeatedly until readable text is reached. Detects double/triple encoding.

Hex ⇄ Base64

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ASCII ⇄ Base64

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URL ⇄ Base64

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File to Base64

Drop a file or click to select. The file will be converted to a Base64 string entirely in your browser.

Click to browse or drag & drop a file here

Supports images, PDFs, audio, text, and more

0 chars

JWT Token Viewer

Paste a JWT token to split and decode its header, payload, and signature parts. Displayed as pretty-printed JSON.

Data URI Generator

Upload an image or file to generate a Data URI with ready-to-use HTML, CSS, and embed code snippets.

Click to browse or drag & drop an image

PNG, JPG, GIF, SVG, ICO, WebP

How It Works

How Base64 Encoding Works

Base64 converts binary data into a safe ASCII text representation using 64 characters.

1

Enter or Paste Data

Type, paste, or drag-and-drop text, a Base64 string, JWT token, or file you want to convert.

2

Choose Action

Click Encode, Decode, or Auto Detect. Enable URL-safe mode or Live Conversion as needed.

3

Copy or Download

Results appear instantly with smart type detection. Copy to clipboard or download the output.

Encoding Guide

Base64 vs Hex vs URL Encoding

Understanding the differences between these encoding methods helps developers choose the right one for each use case.

Feature Base64 Hex (Base16) URL Encoding
Character setA-Z, a-z, 0-9, +, /0-9, A-F%XX hex pairs
Size overhead~33% increase~100% increaseVariable (0-200%)
Use caseEmbedding binary in textLow-level data representationURL parameter safety
ReversibleYesYesYes
SecurityNo encryptionNo encryptionNo encryption
Common inAPIs, JWT, MIME, Data URIsDebugging, hex editorsURLs, query strings
URL safe?No (use URL-safe variant)YesYes (by design)

Use Base64

When embedding images in HTML/CSS, sending binary data in JSON APIs, or dealing with JWT tokens and email attachments.

Use Hex

When displaying raw bytes for debugging, hash outputs, color codes, or when exact byte representation is needed.

Use URL Encoding

When encoding query parameters, form data, or any text that must be safely included in a URL path or fragment.

Use Cases

When Do Developers Use Base64?

API Debugging

Decode Base64-encoded API responses and request payloads to inspect data during development and debugging.

Email Embedding

MIME standard uses Base64 to encode email attachments and non-ASCII characters for reliable delivery.

Authentication Tokens

JWT tokens, OAuth credentials, and Basic Auth headers use Base64 to encode authorization data safely.

Image Embedding

Data URIs encode images as Base64 strings for inline embedding in HTML and CSS, reducing HTTP requests.

Why WebEasier

Why Use Our Base64 Encoder & Decoder?

100% Private

All encoding and decoding runs in your browser. No data is ever sent to a server. Verify by going offline.

Fast Conversion

Real-time encoding as you type. Process large text and files instantly with optimized performance.

Developer Friendly

JWT viewer, Data URI generator, Hex/ASCII converters, multi-layer decoder, and keyboard shortcuts.

Offline Processing

Works without internet after the page loads. No external dependencies needed for any conversion.

Features

Complete Feature List

FAQ

Frequently Asked Questions

Base64 is a binary-to-text encoding scheme that converts binary data into a string of 64 printable ASCII characters: A-Z, a-z, 0-9, plus (+), and slash (/). Padding uses the equals sign (=). It is commonly used when binary data needs to be stored or transmitted over text-based systems like email (MIME), JSON APIs, HTML Data URIs, and JWT tokens.
No. Base64 is an encoding scheme, not encryption. It does not provide any security or confidentiality. Anyone can decode Base64 without a key. It is designed for data transport compatibility. Never rely on Base64 alone to protect sensitive information — use proper encryption (AES, RSA) for security.
Base64 encoding is used when binary data needs to travel through text-based channels. Common reasons include: embedding images in HTML/CSS via Data URIs, encoding file attachments in emails (MIME), transmitting binary payloads in JSON or XML APIs, creating JWT authentication tokens, and storing binary data in text-only databases or configuration files.
To decode Base64 safely: validate that the input contains only valid Base64 characters (A-Z, a-z, 0-9, +, /, =), check that the string length is a multiple of 4, handle UTF-8 encoded content properly, and use a trusted client-side tool like WebEasier that processes everything in your browser without sending data to any server.
Base64 converts binary data to ASCII text using 64 characters, increasing size by ~33%. URL encoding replaces unsafe URL characters with percent-encoded hex values (%XX). Base64 is used for embedding binary data in text formats like JSON and email. URL encoding is used for making strings safe for URLs. They serve completely different purposes.
Yes. Base64 encoding increases data size by approximately 33%. Every 3 bytes of input become 4 bytes of Base64 output (4:3 ratio). For example, a 30KB image becomes roughly 40KB when Base64-encoded. This overhead is generally acceptable when the convenience of text-based embedding outweighs the size increase.
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