Tool Lockers
Developer utilities

Utility

Base64 Encoder / Decoder

Data URI aware
File upload
Output
Converted output will appear here.
Ready to convert.

Practical guide

Using the Base64 Converter

Encode and decode text or data URIs.

Example

Input

Hello, world!

Expected result

SGVsbG8sIHdvcmxkIQ==

Supported inputs

  • UTF-8 text for encoding or decoding.
  • Files are read as data URIs and their Base64 payload is loaded into the input.

Limitations

  • Base64 is an encoding, not encryption; it does not protect secrets.
  • Uploaded files are loaded as Base64 text, not returned as a binary file.

SEO & developer education

How base64 encoder / decoder works

Overview

Convert strings and data URIs between plain text and Base64 quickly with a client-side utility built for speed and clarity.

The converter uses browser-native base64 encoding and decoding so data stays local to the user's machine while working through transforms.
Encoding is useful when serializing binary data or embedding assets in configuration strings, while decoding is handy for reading API payloads and data URIs.
The file upload path supports extracting valid base64 content from data URLs, which is common when working with images or browser-generated assets.
Because the operation is client-side, there is no extra round trip to a backend for normal text conversion tasks.

Working code examples

Encode plain textJavaScript
const text = "hello world";
const encoded = btoa(unescape(encodeURIComponent(text)));
console.log(encoded);
Decode a base64 stringPython
import base64

encoded = "aGVsbG8gd29ybGQ="
print(base64.b64decode(encoded).decode("utf-8"))
Fetch a data URIcURL
curl -L "data:text/plain;base64,aGVsbG8gd29ybGQ="

Edge cases and troubleshooting

  • If input contains Unicode text, make sure it is encoded as UTF-8 before converting so the result remains accurate.
  • When decoding, the data must be valid base64 and may need the padding = characters to produce a complete result.
  • Data URIs often include a prefix like data:image/png;base64,...; remove that metadata if you want the raw payload.
  • For binary files, prefer a dedicated file tool or byte-aware workflow because plain text conversion may not preserve non-text bytes.

Frequently asked questions

Can I upload a file and convert it?+
Yes. The utility can read a selected file and extract the underlying base64 payload from a data URL for immediate conversion or decoding.
Is base64 encryption secure?+
Base64 is not encryption. It is an encoding format designed for safe transport of binary data in text-based systems, not for protecting sensitive data.
Why use Base64 in web apps?+
It is commonly used for embedding images, serializing binary content into URLs, and transporting data across systems that expect text-only content.