Base64 Encoder & Decoder
Encode text into Base64 or decode Base64 back into plain text. Supports UTF-8 characters and a URL-safe option for web and API use.
Usage note: Processing happens directly in your browser; your data is not sent to our servers. Avoid entering sensitive, personal, or illegal content. Privacy Policy and Terms for more details.
Choose the Base64 conversion direction you want to use.
Notes
- This encoder supports full UTF-8 characters (emoji, non-Latin alphabets).
- URL-safe mode replaces + with - and / with _.
- When decoding URL-safe Base64, missing padding will be added automatically if needed.
Encode result
The encoded Base64 output will appear here.
SGVsbG8gZnJvbSBTT05PLUNPTVBSTyDwn5GL
Common use cases
- Encoding small data into URL parameters or tokens.
- Inspecting payloads sent via headers or cookies.
- Decoding Base64 strings from logs, API responses, or JWT payloads.
🔐 Everything runs in your browser — no data is sent to any server
What is a Base64 Encoder & Decoder?
Base64 is an encoding format that converts binary data (such as text, images, or files) into a sequence of ASCII characters so it can safely travel through HTTP, email headers, or systems that only support text. With SONO's Base64 Encoder & Decoder, you can convert text to Base64 and back instantly, right in your browser, without uploading anything to a server.
Common use cases for Base64
- • Embedding images as
data:image/png;base64,...in HTML/CSS. - • Sending tokens or small payloads via URL parameters or query strings.
- • Storing simple configuration data in a text-friendly format.
- • Wrapping binary data so it can pass through text-only systems.
Features of this Base64 tool
- • Encode plain text into Base64.
- • Decode Base64 strings back to their original text.
- • Full UTF-8 support (emoji, non-ASCII characters, etc.).
- • URL-safe mode for query strings and API paths.
- • Everything runs locally in your browser, no server involved.
How to use the Base64 Encoder & Decoder from SONO
- 1. Choose Encode or Decode at the top of the tool.
- 2. Paste your text or Base64 string into the input area.
- 3. Enable the URL-safe option if you need a variant safe for URLs.
- 4. The result will appear automatically in the output area.
- 5. Copy the result using the Copy button and use it in your code, API, or configuration.
This tool is designed for everyday developer workflows: debugging tokens, inspecting payloads, or simply verifying that your Base64 encoding is correct before it reaches production.
Practical examples
- • Inspecting the payload of a Base64-encoded token (e.g., the middle part of a JWT).
- • Converting secrets or API keys to Base64 for basic auth headers.
- • Testing API responses that return Base64-encoded data.
- • Preparing Base64 strings to store in configuration files or environment variables.
Frequently asked questions about Base64
Is Base64 encryption?
No. Base64 is an encoding scheme, not encryption. It's meant to transform binary data into text-safe characters for transport. Anyone with a Base64 string can decode it, so it should not be used alone to protect sensitive data like passwords.
What's the difference between regular Base64 and URL-safe Base64?
Standard Base64 uses + and /, which can cause issues in URLs. The URL-safe variant replaces them with - and _, so the string can be safely used in paths and query strings without additional encoding.
Does this tool store any data I encode or decode?
No. All processing happens locally in your browser. Nothing is sent to SONO's servers or any third party, making it safe for everyday development use.
Quick Guide
Use the tool or form on this page when you need to complete the task described at the top. If you are unsure whether this is the right tool, check the short description and the examples below to confirm it delivers the output you need.
How to Use
- Read the tool description to understand its main function and limits.
- Provide the requested input (text, file, or selection) following the examples.
- Hit the primary action button above (e.g., Generate/Convert/Analyze).
- Review the output; iterate with adjustments if necessary.
- Use copy/download buttons when available to save the result.
Sample Input & Output
- Input: raw text, a URL, or a file as instructed above.
- Output: formatted content, a new file, or a visual preview ready to use.
- Check any notes on the page for size or data-type limits.
Quick FAQ
- What should I do if the result looks wrong? Try a different example input, clean up the formatting (remove extra characters), and run it again.
- Is this tool free to use? Yes, the main features are available without signing up.
- Can I use it on mobile? Most tools are optimized for smaller screens.
Security & Privacy
Most processing happens in your browser, so data is not sent to the server unless explicitly noted on the page. Avoid entering sensitive or confidential information, and clear results after use if the device is shared.