Base64 Encode/Decode
Convert data to a Base64 string, and convert a Base64 string to data
Features
Supports UTF-8 including Japanese
Accurately converts multibyte characters without garbling
Converts automatically as you type
Shows the result instantly, no button needed
Supports up to 1 million characters
Can batch-process long text and larger data
Strict Base64 validation
Shows an error for invalid strings to prevent misconversion
How to Use
Select encode/decode
Select the conversion direction with the top buttons. You can also swap input and output with the center arrow button
Enter text or Base64
Paste a string into the input field and it converts automatically. Click the sample to try it out
Copy or save the result
Copy to the clipboard with the copy button, or save as a text file with the download button
Use Cases
Embedding in data URI format
Base64-encode text such as SVG or CSS and embed it directly into HTML
Checking API response data
Quickly grasp the contents of tokens or attached data returned in Base64 during development
Generating a value for Basic authentication
Easily create an authentication string that combines a username and password
Verifying email content
Decode a MIME-encoded subject or body to investigate the cause of garbling
Basic Knowledge
What is Base64
Base64 is an encoding method that represents binary data such as images using only 64 types of characters (A–Z, a–z, 0–9, +, /), and the resulting data size is approximately 1.33 times larger than the original.
Why Convert to Base64
It is used to safely transport binary data within systems that can only handle text safely, such as email and JSON.
- Data URI：A data URI is a way to embed images directly into HTML or CSS in the format "data:image/png;base64,~".
- Basic Authentication：In Basic authentication, a value created by Base64 encoding "username:password" is sent, so this format conversion is necessary.
Meaning of the Trailing "="
The "=" at the end of a Base64 string is called padding, a symbol for length adjustment. One or two "=" characters are added to make the number of characters after conversion a multiple of 4.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
conversion is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
conversion results and input suggestions are not stored on the server.
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Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
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Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
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Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.