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Encode and decode Base64 safely in your browser.
Encode and decode Base64 safely in your browser.
Nextooly’s Base64 Encoder / Decoder converts text to Base64 and back with full UTF-8 compatibility, ensuring correct handling of emojis, multilingual characters, and special symbols. Strip whitespace, choose optional line wrapping, and switch between Encode and Decode modes instantly with the Swap button.
All encoding and decoding runs entirely in your browser, making the tool ideal for debugging, API testing, security analysis, email/MIME work, and general Base64 manipulation — without any server involvement.
Example
Input: The source text, file, or settings you want to work with.
Output: A clean base64 encoder / decoder result ready for the next step.
If Base64 Encoder / Decoder is close but not quite the right fit, these related Nextooly tools cover adjacent developer & code workflows without sending you to another service.
File to Base64 and Base64 to File
Best if you need to convert any file to Base64 (or Data URL) and decode Base64 back into a downloadable file — all in your browser. No data is uploaded to a server.
Best if you need to encode or decode URL components safely.
Best if you need to aES-256-GCM secure text encryption and decryption with password-based key derivation.
Does this Base64 tool send my text to any server?
No. All Base64 encoding and decoding happens entirely inside your browser tab using JavaScript. Your text, encoded output, and decoding operations never leave your device, ensuring complete privacy.
Is this tool safe for UTF-8 text, emojis, and non-English characters?
Yes. This tool uses a safe UTF-8 compatible Base64 implementation, meaning emojis, multilingual text, special characters, and symbols are all correctly encoded and decoded without corruption or data loss.
What does the line wrapping option (64 or 76 characters) do?
Line wrapping breaks the Base64 output into fixed-length lines, which is required by some email systems, MIME encoders, and older protocols.
Why is there an option to strip whitespace before decoding?
Some Base64 text gets broken across multiple lines or contains tabs/spaces. Stripping whitespace ensures clean decoding and prevents errors with malformed Base64 blocks.
Can this tool decode large binary Base64 data such as files?
This tool is designed for text payloads. For large binary Base64 (PDFs, images, ZIPs), use your dedicated 'File ↔ Base64' converter instead.
What happens when I use the Swap Input/Output button?
The swap button switches between Encode and Decode mode and automatically moves your previous output into the new input field.
Why does decoding sometimes fail?
Common causes include missing padding, hidden whitespace, or incomplete Base64 blocks. Enabling whitespace stripping usually resolves the issue.
2026-04-08
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