Developer tool
Base64 Encoder
The Base64 Encoder converts text to Base64 encoding and decodes Base64 strings back to readable text. It is the everyday tool for handling Base64 data in APIs, configs, and markup.
Encoding and decoding run locally in your browser, so your data never leaves your device.
Privacy & data handling
Browser processingThis tool processes your input locally in your browser. Nothing is uploaded to a server or sent to an external service.
Interactive tool
Base64 Encoder
• RFC 4648 Compliant: Supports both Standard Base64 (using + and /) and URL-Safe Base64 (using - and _ without query parameter conflicts).
• Full UTF-8 Unicode Support: Encodes and decodes multi-byte international scripts (Hindi, Chinese, Arabic, Cyrillic) and 4-byte Emojis cleanly without byte corruption.
• 100% In-Browser Privacy: Your data is encoded and decoded strictly within your browser's local memory. No files or strings are sent to any remote server.
• Safe Execution: Decoded output is treated strictly as raw data and never evaluated as executable scripts.
Overview
What does Base64 Encoder do?
Paste your text and choose encode or decode. Encoding returns the Base64 representation of your text (UTF-8 safe); decoding turns a valid Base64 string back into plain text. Invalid Base64 input produces a clear error.
The tool handles Unicode correctly, so emoji and non-Latin text encode without corruption.
Under the hood
How does it work?
Encoding converts the text to UTF-8 bytes and maps them into the 64-character Base64 alphabet. Decoding reverses the mapping and interprets the result as UTF-8 text. A swap-based normalization handles URL-safe Base64 variants used in web tokens.
Key features
Features of Base64 Encoder
Use cases
When should you use Base64 Encoder?
Debugging APIs
Decode Base64 payloads from API responses or tokens to inspect their contents.
Embedding small data
Encode small strings for data URIs, config values, or storage formats that require text.
Understanding encoded data
Check what a Base64 value actually contains before trusting it.
Step-by-step
How to use Base64 Encoder
- Step 1
Enter or paste your text.
- Step 2
Choose Encode or Decode.
- Step 3
Copy the result to your clipboard.
Real example
Example
Before (input)
Hello, World!
After (encoded)
SGVsbG8sIFdvcmxkIQ==
Encoding is reversible — decoding SGVsbG8sIFdvcmxkIQ== returns Hello, World!.
Technical information
How the details work
Base64 represents binary data using 64 printable characters, with = padding for the final partial group. This tool encodes and decodes UTF-8 text, normalizing URL-safe variants by swapping - and _ back to + and / before decoding.
Privacy & security
Your data stays yours
All processing happens locally in your browser. Your data is never uploaded or stored.
Local processing — files stay in your browser
- Encoding and decoding run on your device with no network requests.
- Nothing you paste is saved after the tab is closed.
- No account or data collection of any kind.
Limitations
What this tool does not do
- Base64 is not encryption — anyone can decode it. Do not use it to protect sensitive data.
- Malformed or truncated Base64 strings will not decode.
- Binary files need to be converted to text first; this tool works on text input.
Frequently asked questions
Common questions about Base64 Encoder
Is Base64 encryption?
No. Base64 is an encoding, not encryption — it is trivially reversible by anyone. Never use it to protect passwords or secrets.
What is the = padding for?
Base64 pads the final group with = signs so the encoded length is a multiple of four. Not all implementations include it.
Why do I see - and _ instead of + and /?
That is URL-safe Base64, used in JWTs and web URLs. The tool normalizes those variants when decoding.
Is my data private?
Yes. Everything runs in your browser and nothing is transmitted or stored.
Does it work with Unicode text?
Yes — the tool encodes text as UTF-8 first, so emoji and non-Latin scripts are preserved.
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