Base64 Encoder & Decoder Online — Free & Instant
Encode and decode Base64 strings.
Base64 encoding converts binary data into ASCII characters. Useful for embedding binary data in text formats like JSON or XML.
Privacy first: This tool runs entirely in your browser. Your data never leaves your device.
Encode any text or binary string to Base64 and decode Base64 back to plain text, all instantly in your browser. Useful for embedding binary data in JSON, HTML, or email, and for inspecting Base64-encoded API values. No data is sent to any server.
How to Use Base64 Encoder/Decoder
- Choose encode or decode: Select whether you want to encode text to Base64 or decode a Base64 string.
- Paste your input: Enter the text to encode, or paste the Base64 string to decode.
- View the result: The output appears instantly.
- Copy: Click "Copy" to copy the result to your clipboard.
Features
- Encodes plain text and binary-safe strings to Base64
- Decodes Base64 strings back to plain text
- Supports URL-safe Base64 variant
- Live output as you type
- Runs entirely in your browser — no server calls
- Free with no account required
Common Use Cases
Developers use Base64 encoding to embed images and fonts directly in CSS or HTML, to pass binary data in JSON API payloads, and to inspect the encoded portions of JWT tokens and HTTP Basic Auth headers.
Frequently Asked Questions
- What is Base64 encoding?
- Base64 is an encoding scheme that converts binary data into a text format using 64 printable ASCII characters. It is commonly used to embed binary content (like images) in text-based formats such as JSON, XML, or email.
- What is the difference between Base64 and URL-safe Base64?
- Standard Base64 uses + and / characters which have special meanings in URLs. URL-safe Base64 replaces + with - and / with _ to make the output safe to use in query strings.
- Can I decode a Base64-encoded image?
- You can decode the Base64 string to see the raw binary data, but rendering it as an image requires a browser that supports data URIs (e.g., data:image/png;base64,...).
- Is Base64 a form of encryption?
- No. Base64 is an encoding, not encryption. Encoded data can be decoded by anyone. Do not use Base64 to protect sensitive information.