Base64 Encoder & Decoder Online (Free Tool)

Encode text to Base64 or decode any Base64 string instantly. Works entirely in your browser—supports Unicode, emojis and special characters with 100% privacy.

Encode • Decode • Supports Unicode & emojis • 100% client‑side • No upload • Private

Try "Hello World" JSON Example
✓ read-only, click copy below
(Replace +/ with -_ , omit padding)
💡 Supports UTF-8 (unicode, emojis, special characters) — Perfect for API tokens, JSON and secure text encoding.

Free Base64 Encoder & Decoder Online Tool (UTF‑8 & URL‑safe)

Use our free Base64 encoder and decoder to instantly convert text to Base64 or decode Base64 strings back to readable text. It works entirely in your browser — no data is uploaded, ensuring full privacy. Ideal for developers, API testing, JSON encoding and secure data transmission.

How to Encode or Decode Base64

1. Enter your text in the input box (plain text to encode or Base64 string to decode).
2. Click "Encode to Base64" or "Decode from Base64".
3. Optionally enable URL‑safe mode for web‑friendly Base64.
4. Copy the result with one click.
5. Use Swap to quickly reverse input/output.

Features of This Base64 Tool

Why Use This Base64 Encoder/Decoder?

Base64 is essential for embedding images in HTML/CSS, transmitting binary data in JSON APIs, email attachments and storing tokens. Our tool handles all edge cases, including Unicode characters and provides a clean interface with helpful examples.

Why Choose Our Base64 Encoder?

Feature Our Tool Typical Online Tools
Data Privacy 100% Client-side Data uploaded to server
Speed Instant processing Slower response
UTF-8 Support Full support (emoji, unicode) Limited support
URL-safe Mode Supported Not always available
Installation No installation required Sometimes required

Common Use Cases

Is Base64 Encoding Secure?

Base64 is not encryption; it's an encoding method that makes binary data safe for text‑based protocols. However, because everything runs locally, your sensitive data (passwords, tokens, proprietary JSON) never leaves your browser — making this tool safe for internal use.

Base64 Encoder/Decoder – Frequently Asked Questions

What is Base64 encoding used for?
Base64 is used to convert binary or text data into an ASCII string format for safe transmission over text‑based protocols (HTTP, email, JSON). Common uses: API tokens, embedding images and storing complex data in databases.
Is this Base64 tool secure?
Yes. Everything runs locally in your browser. No data is sent to any server, so your sensitive information stays private.
What is URL-safe Base64?
URL‑safe Base64 replaces the '+' and '/' characters with '-' and '_' and removes padding '=' so the string can be safely used in URLs and filenames without escaping.
Does the tool support Unicode and emojis?
Absolutely. It uses the TextEncoder/TextDecoder API, so any UTF‑8 character (including emojis, Arabic, Chinese, etc.) is encoded and decoded correctly.
Can I decode a Base64 string that contains newlines?
Yes, the tool automatically trims whitespace and handles multi‑line Base64 input. Simply paste the string and click "Decode from Base64".
Is this tool free?
Yes, it is completely free with no limits or hidden charges. No registration required.