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Overview

Base64 Encoder / Decoder

Encode text or files to Base64, or decode Base64 strings back to plain text.

What is How to use Example Common use cases Frequently asked questions

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Web

Problems

FAQ

Quick links

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#base64-decode-online #binary-to-text #base64-image #atob-btoa #data-uri

Base64 Encoder & Decoder

Instantly convert plain text to Base64 format and vice versa. Fully client-side and UTF-8 safe.

Plain Text Input

Base64 Output

Output will appear here automatically

What you can solve

How to decode a Base64 string online?

This tool encodes and decodes Base64 instantly in your browser. For decoding, provide a valid Base64 string. Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.

How to encode text to Base64?

Yes. The encoder handles full Unicode by using TextEncoder internally before converting to Base64.

How to decode a JWT token payload?

Decoding JWT token payloads to inspect claims. Select Encode or Decode mode, paste your input, and click the action button. Output: SGVsbG8sIFdvcmxkIQ== Decode: Input: U0VDUkVU Output: SECRET Everything runs locally in the browser, which keeps the workflow fast and privacy-friendly.

How to convert image to Base64 data URI?

Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.

How to decode Base64 environment variables?

Decoding Base64-encoded environment variables. This tool encodes and decodes Base64 instantly in your browser. Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.

What does a Base64 string look like?

Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email. For decoding, provide a valid Base64 string. Why does my decoded output look garbled? Everything runs locally in the browser, which keeps the workflow fast and.

Typical workflow

URL DecoderBase64 Encoder / DecoderJSON Formatter – Beautify & Pretty Print JSON Online URL Decoder

Guides for this workflow

Supporting guides that connect this tool to the broader category workflow.

Open category hub

Web guide

How to Debug Redirect URLs, Query Params, and Encoded Targets

A web debugging guide for decoding redirect targets, checking nested query parameters, and spotting double-encoded URLs.

Web guide

URL Encoding Explained: When and Why to Percent-Encode

Why certain characters must be encoded in URLs, the difference between encodeURI and encodeURIComponent, and when double-encoding happens.

Web guide

Web Tools Hub: Encodings, URLs, Headers, and Browser Debugging Workflows

A hub guide to URL, Base64, headers, request helpers, and browser-facing web debugging workflows.

Data guide

How to Debug REST API Responses

A practical guide to reading, validating, and decoding API responses - JSON formatting, Base64 decoding, URL decoding, and timestamp conversion.

What is

What is Base64 Encoder / Decoder?

Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email. This tool encodes and decodes Base64 instantly in your browser.

How to use

How to use Base64 Encoder / Decoder

Select Encode or Decode mode, paste your input, and click the action button. For encoding, any UTF-8 text including Unicode characters is accepted. For decoding, provide a valid Base64 string.

Example

Encode:
  Input:  Hello, World!
  Output: SGVsbG8sIFdvcmxkIQ==

Decode:
  Input:  U0VDUkVU
  Output: SECRET

Common use cases

1. Decoding JWT token payloads to inspect claims.

2. Embedding small images as data URIs in HTML or CSS.

3. Encoding credentials for HTTP Basic Auth headers.

4. Passing binary data through JSON APIs.

5. Decoding Base64-encoded environment variables.

Frequently asked questions

Is Base64 the same as encryption?v

No. Base64 is an encoding scheme — it is trivially reversible and provides zero security. Use it for format compatibility, not secrecy.

Does it support Unicode and emoji?v

Yes. The encoder handles full Unicode by using TextEncoder internally before converting to Base64.

Why does my decoded output look garbled?v

The original data may not have been text — it might be a binary file (image, PDF). Base64 is not limited to text.