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Base64 Encoder & Decoder

Encode text into Base64 or URL-safe Base64url, or decode Base64 strings back into readable text right in your browser.

Free to useNo sign-up requiredWorks in your browserPrivacy focused

Base64 Encoder & Decoder Workspace

How to use

  1. 1

    Step 1

    Choose Encode to Base64 or Decode from Base64 at the top of the tool.

  2. 2

    Step 2

    Optionally check URL-Safe Base64url (- and _) or Omit Padding (=) when working with web tokens or URL parameters.

  3. 3

    Step 3

    Paste your text or Base64 string to see the converted result immediately, then copy or download it as a .txt file.

Key features

  • Supports full international text, symbols, and accented characters without errors
  • Includes URL-safe Base64url mode (- and _) and optional '=' padding removal
  • Clear error message if a Base64 string is incomplete or contains invalid characters
  • Swap Direction & Input button lets you flip between encoding and decoding in one click

Supported formats

Base64UTF-8

File limits & notes

Processes text strings up to 5 MB in your browser. This tool is designed for text and UTF-8 strings; decoding raw non-text binary files (such as images or zip archives) will display a notice that the content is not plain text.

Frequently asked questions

View all FAQs
What is the difference between standard Base64 and URL-safe Base64url?

Standard Base64 uses '+' and '/' characters, which have special meanings in web addresses. Base64url replaces '+' with '-' and '/' with '_' so the encoded string can be placed safely inside URLs and filenames.

Why does my text with international characters work here when some Base64 tools fail?

Older browser tools only support basic English ASCII characters. FetchToolKit properly encodes multi-byte UTF-8 text so all languages and symbols convert accurately.

When should I check Omit Padding (=)?

Base64 strings are normally padded with '=' at the end to make their length a multiple of 4. Many web tokens (like JWTs) and URL parameters omit those trailing '=' characters.

Practical Example: Encoding Multi-Language Text and Decoding API Tokens

Sample Input
A text string containing international characters and symbols that needs to be encoded for an API header.
Result
Cleanly converted into standard Base64 or unpadded URL-safe Base64url and verified back to the exact original text.