Encode any text to Base64 or decode any Base64 string instantly with this free browser-based tool. Switch between Encode and Decode mode, paste your content, and get the result in one click. Use Swap to reverse input and output without retyping. All processing happens locally in your browser — your data is never sent to any server.
How to use the Base64 Encoder
Select Encode to Base64 or Decode from Base64 at the top. Paste your content into the left panel and click the action button. Use Copy result to copy the output, or Swap to move the output back to the input field for chaining operations.
Frequently asked questions
What is Base64 encoding used for?
Base64 is used to encode binary data — images, files, credentials — into a text format safe for transmission in emails, URLs, HTML, and APIs. It’s commonly used in HTTP Basic Authentication headers and embedding images directly in CSS or HTML.
Does Base64 encrypt my data?
No. Base64 is encoding, not encryption. It transforms data into a different format but provides no security. Anyone with the Base64 string can decode it instantly. Do not use Base64 to protect sensitive information.
Why is my Base64 string invalid?
Base64 strings must only contain letters, numbers, +, /, and = padding characters. Extra spaces, line breaks, or unsupported characters will cause decoding errors. Make sure to copy the full string without truncation.