Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 strings back to readable text.
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How to use this calculator
- 1
Choose Encode or Decode mode.
- 2
Enter your text (for encoding) or Base64 string (for decoding).
- 3
The result appears instantly.
Frequently asked questions
What is Base64 used for?
Base64 encodes binary data as ASCII text so it can be transmitted safely in text-only contexts: email attachments (MIME), data URIs (embedding images in HTML/CSS), API tokens, and basic HTTP authentication credentials.
Why does Base64 increase size?
Base64 represents every 3 bytes of input as 4 ASCII characters, increasing size by ~33%. This is the tradeoff for making binary data text-safe.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode a Base64 string instantly — it provides no security. For security, use proper encryption (AES, RSA, etc.).
Base64 encoding and decoding explained
How to use the base64 encoder / decoder
This base64 encoder / decoder gives you instant, accurate results — no registration or download required. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the base64 encoder / decoder works
The base64 encoder / decoder uses standard formulas used in financial planning, budgeting, and investment decisions. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
Who uses this base64 encoder / decoder
This tool is used by financial professionals, students, and anyone managing money. Whether you need a quick estimate or a precise figure for a decision, this base64 encoder / decoder delivers reliable results. It is especially useful when you need to check a calculation without opening a spreadsheet or searching for a formula.
How Base64 works
Base64 maps every 3 input bytes to 4 output characters from a 64-character alphabet (A-Z, a-z, 0-9, +, /). Padding = characters ensure the output length is always a multiple of 4. This makes the output safe for text-only channels.
Common Base64 uses in web development
Data URIs embed images directly in HTML: `<img src="data:image/png;base64,...">`. JWT tokens are Base64-encoded JSON (header and payload). Basic Auth headers: `Authorization: Basic base64(username:password)`. CSS background images can be inline Base64.
Base64 encoder / decoder: how it works
Developer utilities streamline debugging, encoding, formatting, and data validation tasks. This tool is designed for engineers who need reliable, fast results without switching between applications.
Who uses this tool?
Front-end developers, back-end engineers, security researchers, and DevOps professionals use it to inspect, encode, and transform data without leaving the browser — saving context switches and copy-paste errors.
Learn more from an authoritative source:
MDN Web DocsJSON Formatter & Validator
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →