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Base64 Encoder / Decoder
Encode and decode Base64 strings securely. Data is processed locally in your browser and never leaves your device.
Input
Output
How to use Base64 Encoder and Decoder
- 1
Select your desired mode: "Encode" to convert text to Base64, or "Decode" to convert Base64 back to readable text.
- 2
Paste your text or Base64 string into the input area. The tool will process it instantly.
- 3
Copy the resulting output to your clipboard for use in your project.
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Frequently Asked Questions
Answers
What exactly is Base64 Encoding?
Base64 is a binary-to-text encoding scheme. It translates binary data (like images or compiled files) into an ASCII string format using a 64-character alphabet (A-Z, a-z, 0-9, +, /). This ensures that the data remains intact without modification during transport across systems that only handle text, such as email (SMTP) or HTML/CSS files.
What are common use cases for Base64?
Developers use Base64 primarily for embedding binary data in text-heavy environments. Common uses include embedding images directly into HTML or CSS using Data URIs (to reduce HTTP requests), encoding credentials for Basic HTTP Authentication, and attaching files in emails via the MIME specification.
Is Base64 encoding the same as encryption?
No, Base64 is not encryption and provides no security. It is merely a data translation scheme. Anyone with a Base64 decoder can easily read the encoded string. You should never use Base64 to hide passwords or sensitive data unless it is also encrypted.
Is the encoding done securely?
Yes. All data processing on our tool occurs locally in your web browser using JavaScript (specifically the btoa() and atob() functions). No data is ever sent to or stored on our servers, ensuring your sensitive information remains completely private.
Can it handle large strings?
Absolutely, it processes large text blocks instantly. However, keep in mind that Base64 encoding increases the original file size by approximately 33%. So a 3MB file will become a 4MB Base64 string.