Base64 Encoder
Convert text, JSON, or code into Base64 instantly — free, unlimited, in your browser.
- Client-side processing
- Privacy-first
- Unlimited usage
- No account required
- Secure by design
Try a sample:
Input
Encoded Base64 Output
Frequently asked questions
- Is my text uploaded anywhere?
- No. Encoding happens entirely in your browser using the Web Crypto/Encoding APIs — nothing is sent to a server.
- Is Base64 encryption?
- No. Base64 is an encoding, not encryption — anyone can decode it back to the original text. Don't use it to protect sensitive data.
- Why is the output longer than my input?
- Base64 represents every 3 bytes of input as 4 output characters, so encoded text is roughly 33% larger than the original — shown as Encoding Overhead below the result.
- Does this handle Unicode text correctly?
- Yes — text is encoded as UTF-8 bytes before Base64 conversion, so accented characters, emoji, and non-Latin scripts round-trip correctly when decoded.
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What is the Base64 Encoder?
The Base64 Encoder converts plain text, JSON, XML, code snippets, or configuration data into Base64 — a text-safe encoding used for embedding binary-ish data in places that only accept ASCII, like JSON fields, URLs, HTTP headers, and config files. Everything runs client-side, so nothing you paste ever leaves your browser.
Use cases
- Embedding a JSON payload or image data inside another JSON document or config file
- Preparing a Basic Auth header value (username:password) for an HTTP request
- Encoding a JWT payload segment for inspection or manual construction
- Converting a config file or manifest into a text-safe format for environment variables or CI pipelines
How to use the Base64 Encoder
- 1
Paste your text
Paste or type any text into the input panel — plain text, JSON, XML, or code.
- 2
Encode
Click Encode to Base64 (or press Ctrl/Cmd+Enter) to convert it.
- 3
Copy or download
Use Copy to grab the result, or Download to save it as a text file.