Base64 text encoder and decoder
Convert Unicode text to standard Base64 or decode Base64 back to UTF-8 text. Useful for inspecting textual payloads in development. Copy or download the transformed text; all processing stays in the browser.
Free to use. No email or account required.
Your inputs
Calculations run in your browser. Inputs are not saved or sent to analytics.
Your result
Complete the inputs to see your result.
How it works
- Encoding converts text to UTF-8 bytes, then groups bytes into Base64 characters. Decoding validates the standard alphabet and round-trip padding before decoding UTF-8 strictly.
- Worked example
- Hello → SGVsbG8=
Assumptions and limitations
Base64 is encoding, not encryption. Uses the standard +/ alphabet with canonical = padding; URL-safe Base64, whitespace and binary file decoding are outside scope. Invalid padding, noncanonical unused bits and non-UTF-8 decoded bytes are rejected. Limit: 200,000 input code units.
How to use this tool
Choose encode or decode and enter UTF-8 text or canonical Base64. Generate, inspect and copy the output. Invalid padding or decoded non-UTF-8 bytes are rejected.
When this is useful
Inspect text payloads or verify an encode/decode round trip. Base64 is reversible encoding, not encryption; do not use it to conceal a password or secret.
Sources
- IETF RFC 4648 — Base64 encoding Sources reviewed: 2026-10-28
Processing and privacy
The calculation or transformation runs in your browser. The tool does not send its input values or generated output to an application server. Loading a page still makes infrastructure requests; optional analytics and Google consent messages have separate controls.
Privacy Policy. Privacy & preferences in the footer controls optional analytics.
Sources and maintenance
Maintained by emonster. Sources are listed with their own review dates; these are not live-data timestamps or claims of independent expert certification.
