Base64 Encode & Decode Online - UTF-8 Safe RFC 4648 Converter
Encode UTF-8 text into RFC 4648 Base64 strings or decode Base64 payloads back to human-readable text locally in your browser, built for debugging HTTP headers, configuration strings, and API payloads.
This tool processes your input on your device.
Developer tools
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How to use it
Follow these steps in the workspace above.
- Choose Encode (Text to Base64) or Decode (Base64 to Text) in the workspace.
- Paste your string, JSON snippet, or encoded text into the input editor.
- Copy the converted output with one click, full multi-byte UTF-8 characters and emojis are preserved without corruption.
How it works
Base64 encoding (RFC 4648) translates arbitrary 8-bit binary streams into a safe 64-character ASCII alphabet (A-Z, a-z, 0-9, +, /, and = padding) so data can travel through text-only protocols like HTTP headers, email MIME bodies, XML, and JSON without control-character corruption.
Why Standard JavaScript btoa() Fails on UTF-8 (And How We Fix It)
Browser-native btoa() throws an InvalidCharacterError whenever a string contains characters outside the Latin1 (ISO-8859-1) range, such as Urdu, Arabic, smart quotes, currency symbols, or emojis. Our tool encodes and decodes via a full TextEncoder / Uint8Array UTF-8 byte pipeline so international text round-trips with 100% byte accuracy.
- HTTP Header & Payload Debugging: Inspect Base64-encoded headers, webhook payloads, and MIME strings cleanly.
- Cloud & App Configs: Quickly encode or inspect Base64 configuration values locally in your browser.
- Encoding vs. Hashing: Base64 is a reversible encoding scheme. Use our SHA-256/512 Hash Generator or JWT Decoder when inspecting cryptographic digests and tokens.
