Base64 Encoder
Encode text to Base64 for data transmission.
A Base64 encoder converts text into a Base64 string — a safe, ASCII representation used to transmit binary data over text-based systems.
How to Use the Base64 Encoder
- Paste your text. Enter the text to encode.
- Copy the result. Get the Base64-encoded string.
This tool processes your input locally in your browser. Nothing is uploaded.
What Is Base64 Encoder?
Base64 encoding represents data as ASCII text so it can be sent over systems that only support text, such as email and JSON.
What is Base64?
Base64 maps binary data to a 64-character alphabet (A–Z, a–z, 0–9, +, /) with = padding. It increases size by about 33% but guarantees safe transmission.
Common uses
Base64 is used in data URIs for images, email attachments, API auth tokens and embedding small files in JSON.
Key Features
- UTF-8 aware encoding
- Instant output
- Local processing
Examples
- "Hello" encodes to "SGVsbG8=".
Common Use Cases
- Data URIs
- API tokens
- Embedding binary data
Tips & Best Practices
- Base64 is encoding, not encryption; do not use it to protect secrets.
Limitations
- Base64 is larger than the original data.
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Frequently Asked Questions
What is Base64?
A way to represent binary data as ASCII text using a 64-character alphabet.
Is Base64 encryption?
No, it is encoding, easily reversed and not secure.
Is it free?
Yes, and it runs locally.