Free Base64 Encoder / Decoder
for text and Base64URL.
Encode and decode Base64 instantly with this free online Base64 tool. No accounts. No uploads. No telemetry.
Plain text input
Base64 output
aGVsbG8gd29ybGQ=Supported
- Base64 encoding
- Base64 decoding
- Base64URL encoding
- Base64URL decoding
- UTF-8 text input and output
- Instant browser-based conversion
Automatically handled
- UTF-8 safe text encoding and decoding
- Client-side conversion with no uploads
- One-click copy for converted output
- URL-safe Base64 format for JWT-style payloads
Not supported yet
- File to Base64 conversion
- Automatic MIME type detection
- Binary file preview
Free online Base64 encoder and decoder
This tool works as a Base64 encoder, a Base64 decoder, and a quick way to convert UTF-8 text to Base64 or decode Base64 back into readable text.
This Base64 converter supports both standard Base64 and Base64URL, making it useful for browser development, API work, token inspection, and general debugging tasks.
Developers often use Base64 for Authorization headers, JWT payloads, data URLs, encoded configuration values, and application data passed between systems.
Everything runs locally in your browser, so your input is not uploaded or stored anywhere.
Example
hello world → aGVsbG8gd29ybGQ=Paste plain text to encode it to Base64, or paste Base64 to decode it back into readable text instantly.
Encode text to Base64 or decode Base64 online
Use this converter to quickly encode plain text to Base64, decode Base64 to text, or switch to Base64URL for URL-safe encoded values.
Common use cases
- Encode text values for APIs or transport layers
- Decode Base64 strings from logs, requests, or application payloads
- Inspect JWT payload segments with Base64URL
- Debug Basic Auth headers and encoded credentials
How it works
In encode mode, the tool converts UTF-8 text into standard Base64 or Base64URL. In decode mode, it validates the encoded input and transforms it back into readable text.
This is useful when working with browser applications, APIs, authentication headers, tokens, and encoded text values that need to be inspected quickly.
The conversion happens entirely client-side for speed, privacy, and simplicity.
What is the difference between Base64 and Base64URL?
Standard Base64 uses characters like + and /, while Base64URL replaces them with URL-safe alternatives so encoded values can be used more easily in URLs, tokens, and web applications.
Base64URL is commonly used in JWTs and authentication systems where special characters or padding may be inconvenient.
FAQ
What is a Base64 encoder / decoder?
A Base64 encoder / decoder converts plain text to Base64 and decodes Base64 back into readable text.
Does this tool support Base64URL?
Yes. You can switch between standard Base64 and Base64URL depending on your use case.
Is this Base64 tool safe?
Yes. Everything runs in your browser and your input is not uploaded.
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