Free Online Base64 Encode and Decode Tool
Encode text or files to Base64, or decode Base64 strings back to plain text — instantly and privately.
Hey there! Base64 is one of the most commonly used encoding methods in web development. Whether you need to embed an image in HTML, pass binary data in JSON, or handle authentication headers, this free tool makes encoding and decoding Base64 simple and fast.
Everything runs directly in your browser — 100% private, no signup, and no data is sent anywhere.
What is Base64 Encoding?
Base64 is a way to convert binary data (like images, files, or bytes) into a text format using only 64 safe ASCII characters. This makes it safe to send binary data through text-based systems such as emails, APIs, and web pages.
When Should You Use Base64?
- Embedding images or files directly into HTML or CSS using Data URIs
- Encoding credentials for Basic Authentication in APIs
- Handling binary data inside JSON payloads
- Working with JWT tokens or email attachments
- Converting files to text for safe storage or transmission
Base64 Encode vs Decode – How It Works
Our tool supports both directions with a simple toggle:
- Encode mode: Convert plain text or any file into Base64
- Decode mode: Convert a Base64 string back to readable text
You can also drag and drop any file (images, PDFs, documents, etc.) to encode it instantly.
How to Use the Base64 Tool in 3 Simple Steps
- Choose **Encode** or **Decode** mode using the toggle buttons.
- Paste your text or drop a file into the input area.
- The result appears instantly in the output panel. Copy it or download as a file with one click.
Key Features
- Instant real-time conversion as you type
- Support for encoding any file type (images, PDFs, etc.)
- One-click Swap button to move output back to input for testing
- Shows character count, file size, and encoding ratio
- Copy to clipboard or download the result
- Sample button to quickly test with realistic data
- Completely private and browser-based
Real Example
Plain Text:
Hello, jsonweb.in! This is a Base64 example.
Base64 Encoded:
SGVsbG8sIGpzb250b29scy5pbiEgVGhpcyBpcyBhIEJhc2U2NCBleGFtcGxlLg==
Pro Tips
- Use the Swap button to quickly test encode → decode round trips
- Drop image files to get Base64 strings ready for HTML data URIs
- Always remove extra spaces or line breaks when decoding
- Combine with the JSON Validator if you're working inside JSON data
Why Developers Love This Base64 Tool
- Forever free with no limits or ads
- Fast and accurate encoding/decoding
- File drag-and-drop support
- Clean, modern interface that works on mobile
- 100% private — your data never leaves your device
Ready to Encode or Decode Base64?
Stop struggling with manual conversion or unreliable online tools. Get instant, accurate results every time.
→ Encode or Decode Base64 Now – Free & Private