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Base64 Encoder / Decoder

Encode text or files to Base64 and decode them back. All processing happens in your browser.

Understanding Base64 Encoding & Decoding

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is widely used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data. This ensures that the data remains intact without modification during transport.

How This Tool Processes Your Data

All processing happens locally in your browser using standard JavaScript methods:

  • Text Encoding: We use the btoa() method combined with URI encoding to handle UTF-8 characters correctly, ensuring that emojis and special symbols are preserved.
  • Text Decoding: The atob() method reverses the process, reconstructing your original text from the Base64 string.
  • File Conversion: Our File to Base64 feature uses the FileReader API to read your files into DataURLs, allowing you to embed images or assets directly into code.
  • Privacy Guarantee: Because these methods run entirely in your browser, your sensitive keys, passwords, or private files are never uploaded to our servers.

Common Use Cases

Base64 is essential for developers. It is commonly used for embedding images in HTML or CSS, transmitting data in JSON objects, and basic obfuscation of data strings in URLs. Our tool makes this process seamless and secure.

Frequently Asked Questions

Is Base64 a form of encryption?
No. Base64 is an **encoding** scheme, not encryption. It is used to transform data so it can be transmitted safely, but it can be easily decoded by anyone. Never use Base64 to secure sensitive data without additional encryption.
Does Base64 increase file size?
Yes. Base64 encoding typically increases the data size by about 33% compared to the original binary data. This is because every 3 bytes of binary data are represented by 4 characters of text.
Can I encode large files?
Yes, but keep in mind that very large files (over 50MB) may slow down your browser as the entire encoded string must fit into your device's memory.