Base64 Encode Decode Online
Encode text to Base64 or decode Base64 back to plain text instantly. Useful for API debugging, auth tokens, data URLs, and quick developer workflows.
Base64 Encoder / Decoder
Supports UTF-8 text. URL-safe Base64 input is also accepted when decoding.
Try examples
What Is Base64 Encoding?
Base64 is a text-based encoding format that converts binary data into ASCII characters. It is commonly used when you need to transport binary data through systems that expect text, such as JSON payloads, URLs, HTML data URIs, and email content.
Base64 does not provide encryption. It only transforms data format for transport or storage. Anyone can decode Base64 back to the original data.
Common Use Cases
- Decode API response fields that return encoded values.
- Prepare HTTP Basic Auth credentials in development environments.
- Handle JWT segments or token payload debugging.
- Build data URLs for small inline resources.
Encoding Pattern Reference
| Pattern | Use Case | Tip |
|---|---|---|
| Standard Base64 | Most API payload fields and generic transport | Contains + and / characters. |
| Base64URL | JWT token parts and URL-safe scenarios | Uses - and _ instead of + and /. |
| Padded Base64 | Strict decoders expecting full blocks | Usually ends with = or ==. |
Real Debugging Examples
- Broken Basic Auth: username/password not encoded as
user:passbefore Base64. - JWT payload unreadable: pasted entire token instead of only header/payload segment.
- API decode fails: missing padding from copied Base64 string.
Related Tools
- JWT Decoder
- JSON Formatter
- URL Encode Decode
- Hash Generator
- HMAC Generator
- Unix Timestamp Converter
- Cron Expression Generator
- Cron Expression Parser
Common Mistakes
- Assuming Base64 is secure: Base64 is not encryption and provides no confidentiality.
- Decoding partial token: only decoding a fragment leads to invalid output.
- Mixing Base64 and Base64URL: convert
-/_and padding when needed. - Ignoring UTF-8: non-ASCII text can break if decoder is not UTF-8-safe.
Recommended Debug Flow
- Determine whether your input is Standard Base64 or Base64URL.
- Decode here and inspect whether output is plain text or JSON.
- If decoded text includes timestamps, verify with Unix Timestamp Converter.
- If source is JWT, continue with JWT Decoder for claim checks.
Frequently Asked Questions
Is Base64 encryption?▾
No. Base64 is only an encoding format. It does not protect data and can be decoded easily.
Why do I get invalid Base64 errors?▾
Your input may contain unsupported characters, missing padding, or broken line breaks copied from another source.
Can this tool decode UTF-8 characters and emojis?▾
Yes. This tool is UTF-8-safe and supports multilingual content and emojis in both encode and decode modes.
Why does my JWT payload look unreadable?▾
JWT parts are Base64URL encoded. Decode the middle segment first, then parse JSON to inspect claims.