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UTF-8-safe Base64 encode & decode with a URL-safe variant, line-wrapping and file-to-Base64 (data URI).
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Base64 Encoder converts text to Base64 and back, representing data in an ASCII-safe form that travels reliably through systems expecting text. It's a daily utility for developers working with APIs, data URIs, and config.
The single most important thing to understand is that Base64 is encoding, not encryption. It scrambles nothing and protects nothing, anyone can decode it instantly without a key. Its job is safe transport: embedding an image in CSS, putting credentials in a Basic Auth header, or including binary in JSON, all without corruption. For anything that must stay secret, use real encryption.
The tool encodes as UTF-8, so Unicode, emoji, accents, non-Latin scripts, round-trips correctly, avoiding the mangled-character bug that trips up naive implementations. And because encoding runs in your browser, sensitive strings like tokens never leave your device.
Keep in mind Base64 output is roughly a third larger than the input, since every three bytes become four characters. Pair this with the URL Encoder and JWT Decoder for a complete toolkit when debugging requests and payloads.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Developer Tools |
Paste your text or Base64 string
Choose encode or decode
The converted result appears instantly
Copy it for use in your code or request
Encode text to Base64 and decode Base64 back to text in one tool
Handles full Unicode (UTF-8), so emoji and accented characters survive the round trip
Instant conversion as you type or paste
One-click copy of the result
Runs in your browser, your data is never uploaded
Free, with no signup and no rate limit
Encoding credentials or tokens for a Basic Auth header while testing an API
Decoding a Base64 string from a config, JWT part, or data URI to read it
Embedding small payloads as Base64 in code or URLs
Inspecting Base64-encoded data during debugging
Never treat Base64 as security, it's reversible by anyone; encrypt data you actually need to protect
If a decode produces garbled characters, the source likely wasn't UTF-8, check the original encoding
Remember the ~33% size increase when embedding Base64 in code or URLs
Common questions about this tool, its workflow, and what to expect before you use it.
IETF
Defines the Base64 alphabet and padding, and the URL-safe variant.
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UTF-8-safe Base64 encode & decode with a URL-safe variant, line-wrapping and file-to-Base64 (data URI).
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