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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.

Quick start: Paste your plain text or Base64 string into the input area. → Click 'Encode' to convert text to Base64, or 'Decode' to convert Base64 back to text. → Review the output in the result area — Unicode characters are handled correctly in both directions.

How to use Base64 Encode/Decode

  1. 1

    Paste your plain text or Base64 string into the input area.

  2. 2

    Click 'Encode' to convert text to Base64, or 'Decode' to convert Base64 back to text.

  3. 3

    Review the output in the result area — Unicode characters are handled correctly in both directions.

  4. 4

    Click the copy button to place the result on your clipboard.

Real examples of Base64 Encode/Decode in action

HTTP Basic Auth header
Before
admin:s3cret!
After
YWRtaW46czNjcmV0IQ== (ready to prepend 'Basic ' in an Authorization header)
Decode a JWT payload segment
Before
eyJzdWIiOiIxMjM0IiwibmFtZSI6IkphbmUifQ
After
{"sub":"1234","name":"Jane"}
Emoji encoding
Before
Hello! 🎉
After
SGVsbG8hIPCfjok= (UTF-8 safe)
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Who is Base64 Encode/Decode for?

API developers building HTTP Basic Authentication headers

Security engineers decoding suspicious Base64 payloads during incident review

Frontend devs embedding small images as data URIs in CSS

Integration engineers working with Base64-encoded secrets in environment files

SREs decoding Base64 values stored in Kubernetes secrets for debugging

Why use Base64 Encode/Decode?

  • Full Unicode support — emoji, CJK characters, and non-Latin scripts encode and decode correctly.
  • One-click copy puts the result on your clipboard instantly.
  • Zero network calls — everything runs in your browser with no data sent to any server.
  • Handles large strings without issues on modern devices.

Common use cases

  • Encode credentials for HTTP Basic Authentication headers during API development.
  • Decode the payload segment of a JWT token to inspect its claims.
  • Work with data URIs by encoding small assets to embed in HTML or CSS.
  • Decode Base64-encoded configuration values found in environment files or API responses.

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.

ToolMain limitation
Base64decode.orgSends pasted strings to their server, which is unsafe for credentials
Base64encode.netAd-heavy and logs activity for analytics
openssl base64Requires OpenSSL installed and CLI comfort
Base64 Encode/DecodeFree, runs in your browser, no sign-up, no watermarks, no file-size limits beyond your device memory.

Limitations & things to know

  • Binary files should use the Image to Base64 tool instead
  • Very large strings may slow the browser
  • URL-safe Base64 variant is not supported yet

About Base64 Encode/Decode

Base64 encoding is everywhere in web development — JWT tokens, data URIs, HTTP basic auth headers, and API payloads all use it. Xevon Tools' Base64 Encode/Decode tool handles text in both directions with full Unicode support, running entirely in your browser. The tool uses TextEncoder and TextDecoder under the hood, which means emoji, CJK characters, and non-Latin scripts round-trip correctly — a common pain point with simpler implementations that only handle ASCII. Paste a string, click encode or decode, and copy the result with one click. Whether you are debugging a JWT payload, encoding credentials for an API header, or working with Base64-encoded config values in environment files, this tool gives you the answer instantly without installing a CLI utility or leaving your browser.

Frequently asked questions

Yes. The tool uses TextEncoder/TextDecoder under the hood so any UTF-8 text round-trips correctly.
This version handles text strings. For encoding image files as Base64, use our Image to Base64 tool which accepts file uploads directly.
Standard Base64 uses + and / characters which are not safe in URLs. URL-safe Base64 replaces them with - and _. This tool uses standard Base64. URL-safe encoding support is planned.
No. The encoding and decoding happen entirely in your browser using the built-in TextEncoder and btoa/atob APIs. Nothing is transmitted over the network.

Helpful tutorials

Practical guides that show real workflows for this tool and related tasks.

Base64 Encoding Explained for Beginners

What Is Base64 Encoding and Why Use It

Free Tools for Web Developers in 2026

Your files never leave your device

Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.

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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).

<iframe src="https://www.xevontools.com/embed/base64-encode-decode" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px;" title="Base64 Encode/Decode — Xevon Tools"></iframe>
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