TMToolMetro

Base64 Encoder / Decoder

Encode plain text to Base64 or decode Base64 strings back to readable text.

Encoding Toolsavailable

Converted output will appear here.

Enter text before converting.

About Base64 Encoder / Decoder

Use the Base64 Encoder / Decoder to convert readable text into Base64 or decode Base64 values back into UTF-8 text. It is useful for checking encoded snippets, test values, copied API data, configuration values, and small text payloads without leaving the browser.

How to use

  1. Choose Encode when you want to turn readable text into Base64.
  2. Choose Decode when you want to turn a Base64 string back into readable text.
  3. Paste or type your input into the text box.
  4. Click Convert to create the output.
  5. Copy the result when you need to use it elsewhere, or clear the tool to start again.

Worked example

Encode a short label

Sample input

ToolMetro

Base64 output

  • VG9vbE1ldHJv

Features

  • Encodes plain text into Base64.
  • Decodes valid Base64 back to UTF-8 text.
  • Supports common Unicode text during encoding and decoding.
  • Ignores whitespace in Base64 input when decoding.
  • Handles missing Base64 padding where possible.
  • Shows clear errors for empty or invalid input.
  • Runs in the browser without requiring an account.

How it works

  • Encode mode converts the input text to UTF-8 bytes with TextEncoder.
  • Those bytes are converted to a Base64 string using the browser's Base64 APIs.
  • Decode mode removes whitespace from the Base64 input before validation.
  • The decoder checks the cleaned input against a Base64 pattern before attempting conversion.
  • If padding is missing, the tool adds the required equals signs before decoding.
  • Decoded bytes are converted back to UTF-8 text with TextDecoder, and invalid text data returns an error.

Common use cases

  • Checking encoded API values and copied response fields.
  • Preparing small text snippets for development, demos, or testing.
  • Decoding Base64 strings from logs, examples, or support tickets.
  • Inspecting configuration values that were encoded for transport.
  • Creating sample encoded values for documentation or test fixtures.
  • Round-tripping text to confirm that an encoded value decodes as expected.

Frequently asked questions

What does the Base64 Encoder / Decoder do?

It converts plain text to Base64 and decodes valid Base64 strings back to plain text.

What is Base64 used for?

Base64 is commonly used to represent binary or text data using a limited set of safe characters for transport, storage, examples, and configuration values.

Does the tool encode text or files?

This tool is for text input. It does not upload, encode, or decode files.

Does the Base64 tool support Unicode text?

Yes. The tool uses UTF-8 encoding so common Unicode text can be encoded and decoded correctly.

Can it decode Base64 with spaces or line breaks?

Yes. The decoder removes whitespace before validating and decoding the Base64 input.

Does Base64 encryption keep data secure?

No. Base64 is an encoding format, not encryption. Anyone with the encoded value can decode it if they know it is Base64.

Why does my Base64 input fail to decode?

The input may contain unsupported characters, broken padding, or bytes that are not valid UTF-8 text.

Does the decoder require equals-sign padding?

Not always. The tool can add missing padding where possible before decoding.

Is my input sent to ToolMetro?

No. Encoding and decoding run in your browser and do not require server-side processing or an account.

Can I copy the converted output?

Yes. After a successful conversion, use Copy output to place the result on your clipboard.