Base64 Encode/Decode
Encode text to Base64 or decode Base64 back to text. Unicode-safe.
Encode text to Base64 or decode Base64 back to text. Unicode-safe.
How to use Base64 Encode/Decode
- 1
Paste plain text or a Base64 string into the input area.
- 2
Click Encode to turn text into Base64, or Decode to turn Base64 back into text.
- 3
Check the output area, where emoji and non-Latin characters round-trip correctly.
- 4
Click the copy button to place the result on your clipboard.
Real examples of Base64 Encode/Decode in action
admin:s3cret!
YWRtaW46czNjcmV0IQ== (prefix with 'Basic ' in the Authorization header)
eyJzdWIiOiIxMjM0IiwibmFtZSI6IkphbmUifQ
{"sub":"1234","name":"Jane"}Hello! 🎉
SGVsbG8hIPCfjok= (UTF-8 bytes, not corrupted)
Who is Base64 Encode/Decode for?
API developers assembling HTTP Basic Authentication headers
Security engineers decoding suspicious Base64 payloads during incident review
SREs reading Base64 values stored in Kubernetes secrets
Frontend developers embedding small assets as data URIs
Why use Base64 Encode/Decode?
- Encodes and decodes full UTF-8, so emoji, CJK text, and accented characters survive the round trip intact.
- Uses the browser's TextEncoder and TextDecoder, avoiding the classic 'character out of range' error that plain btoa throws on Unicode.
- Works in both directions from one box, so you can paste a value and pick the operation.
- Makes no network calls, which is essential when decoding tokens or credentials.
- Copies the result with a single click for pasting into headers, code, or config files.
Common use cases
- Encode a username and password into the value for an HTTP Basic Authentication header.
- Decode the payload segment of a JWT to read its claims without a dedicated decoder.
- Decode a Base64 value pulled from a Kubernetes secret or an environment file during debugging.
- Build a small data URI by encoding a short snippet for embedding in HTML or CSS.
How Base64 Encode/Decode keeps your data private
Base64 encoding happens via the browser's native btoa/atob and TextEncoder APIs — no roundtrip to any server. This is critical for decoding production secrets, API tokens, or credentials, since those values must never leave developer machines. Many online Base64 tools log input; ours cannot, because it never receives any input.
How Base64 Encode/Decode compares to alternatives
Honest comparison to other popular options — pick the right tool for the job.
| Tool | Main limitation |
|---|---|
| Base64decode.org | Sends pasted strings to its server, unsafe for credentials or tokens |
| Base64encode.net | Ad-heavy and runs analytics on activity |
| openssl base64 | Requires OpenSSL installed and care with line-wrapping flags |
| Base64 Encode/Decode | Free, runs in your browser, no sign-up, no watermarks, no file-size limits beyond your device memory. |
Limitations & things to know
- Handles text strings only; binary files belong in the Image to Base64 tool
- Produces standard Base64; the URL-safe variant using - and _ is not yet supported
About Base64 Encode/Decode
Base64 is an encoding scheme that represents binary data using only 64 printable ASCII characters (A to Z, a to z, 0 to 9, plus + and /), with = used for padding. It is not encryption and provides no security; its job is to let arbitrary bytes travel safely through channels that expect text, such as HTTP headers, JWT segments, data URIs, and email attachments. Xevon Tools' Base64 Encode/Decode tool converts in both directions with full Unicode support. The Unicode part matters more than it sounds: the browser's built-in btoa function only accepts Latin-1 characters and throws an error the moment you feed it an emoji or a Chinese character. This tool avoids that trap by first running your input through TextEncoder to produce UTF-8 bytes, then Base64-encoding those bytes, and reversing the process on decode with TextDecoder. The practical result is that 'Hello! [party]' or a Japanese sentence round-trips cleanly. Encoding inflates size by roughly one third, since every three bytes of input become four Base64 characters, which is the trade-off for text safety. Common jobs include assembling an HTTP Basic Authentication header (the credentials are Base64 of 'user:password', not encrypted, so treat them as plaintext over HTTPS), peeking at a JWT payload, or decoding a value stored in a Kubernetes secret. Because all of this happens locally in your browser, you can safely decode production tokens and credentials that must never leave a developer's machine. Paste a string, pick encode or decode, and copy the result in one click without installing a CLI utility.
Frequently asked questions
Helpful tutorials
Practical guides that show real workflows for this tool and related tasks.
Your files never leave your device
Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.
Embed Base64 Encode/Decode on your site
Add this tool to your own website, blog, or internal tool page with one line of code. Free to use, no attribution required (but appreciated).
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