🔐 Base64 Encoder/Decoder

Convert text and files to Base64 — supports URL-safe mode & batch conversion

Text
File
Batch
Output:

How to Use This Base64 Converter

  1. Choose your encoding direction — Decide whether you need to encode text into Base64 format or decode Base64 back into readable text. Encoding is useful when you need to safely transmit binary data (like images or files) through text-based systems such as email, JSON, or XML. Decoding reverses the process, converting Base64 strings back to their original form. The tool provides separate tabs or buttons for each operation, making it easy to switch between encoding and decoding as needed.
  2. Enter your input text or Base64 string — Paste the text you want to encode or the Base64 string you want to decode into the input field. The converter supports all standard characters including Unicode text (emoji, Chinese characters, accented letters, etc.) by using UTF-8 encoding before the Base64 conversion. This means you can safely encode any text in any language, not just ASCII characters. For large inputs, the tool handles strings up to several megabytes in length without performance issues.
  3. Click "Encode" or "Decode" to convert — Press the appropriate button to perform the conversion. The result appears instantly in the output field. For encoding, the output will be a Base64 string that is approximately 33% longer than the original input (this is a mathematical property of Base64: every 3 bytes of input become 4 bytes of output). For decoding, the tool validates the input string first and will display an error message if the input is not valid Base64, helping you catch formatting issues like missing padding characters.
  4. Copy or download your results — Use the copy button to copy the result to your clipboard with a single click. The converter also supports file-based operations — you can upload a file (such as an image or document) to encode it into a Base64 string, or paste a Base64-encoded file to decode and download the original file. Batch conversion mode allows you to process multiple strings simultaneously, which is especially useful for developers working with API payloads or data migration tasks.

Frequently Asked Questions

Q: What is Base64 encoding and why is it used?

Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters (A–Z, a–z, 0–9, +, and /). It was originally designed for encoding binary data in email messages (MIME encoding), since email protocols can only reliably transmit text. Today, Base64 is used extensively in web development for embedding images directly in HTML or CSS (as data URIs), transmitting binary data in JSON payloads (such as in REST APIs), storing complex data in cookies or URL parameters, and encoding authentication credentials for HTTP Basic Auth. The key advantage is that Base64-encoded data can pass through any text-based channel without corruption, though the 33% size increase means it should not be used for large-scale data storage where efficiency matters.

Q: Is Base64 encoding the same as encryption?

No, absolutely not. Base64 encoding is not encryption — it is simply a different way of representing the same data, similar to writing a number in hexadecimal instead of decimal. Anyone who sees a Base64 string can easily decode it back to the original data using any Base64 decoder (including this tool). Base64 provides zero security or privacy protection. If you need to protect sensitive data, use proper encryption algorithms like AES-256. Base64 is often used alongside encryption (encrypted binary output is Base64-encoded so it can be transmitted as text), but the encoding itself adds no cryptographic security whatsoever. Never use Base64 encoding as a substitute for encryption when handling passwords, personal data, or any sensitive information.

Q: Why does my decoded Base64 output look like garbled text?

If the decoded output appears as garbled or unreadable characters, the original encoded data was most likely binary content (such as an image, PDF, or compiled file) rather than plain text. Base64 faithfully preserves all byte values, including non-printable characters, so decoding a Base64-encoded image file will produce the raw binary bytes of that image — which look like gibberish when displayed as text. To properly handle such cases, use the file upload/download feature of this converter, which correctly preserves binary data through the encode/decode cycle. If you are decoding what should be plain text and it still appears garbled, double-check that the input uses standard Base64 encoding (not Base32, Base58, or a variant) and that no extra characters or line breaks have been accidentally included in the input.