You are preparing URL-safe examples, checking API data, or learning how Base64URL differs from standard Base64.
Base64URL Encoder and Decoder
Encode UTF-8 text to Base64URL or standard Base64, decode strings, and compare URL-safe output locally in your browser.
Start here
Choose encode or decode.
Browser-first
Your text is encoded and decoded locally in your browser and is not uploaded to a server.
Useful for
Encode short text for URL-safe values
Mode
Text is processed locally in your browser and is not uploaded to a server. Do not paste passwords, private keys, or sensitive tokens into pages you do not trust.
Quick answer
Encode or decode UTF-8 text with Base64URL or Base64
Choose URL-safe Base64URL or standard Base64, encode readable UTF-8 text, or decode a valid encoded string directly in your browser.
Base64 is reversible encoding, not encryption; do not treat it as protection for passwords, keys, tokens, or private records.
Text Cleaner: Clean messy text by trimming lines, removing empty lines, merging lines, or converting one item per line into a comma list.
About this tool
Encode UTF-8 text to Base64URL or standard Base64, decode strings, and compare URL-safe output locally in your browser.
Your text is encoded and decoded locally in your browser and is not uploaded to a server.
Reminder
Base64 and Base64URL are encoding formats, not encryption. Do not paste passwords, private keys, access tokens, or other sensitive data into pages you do not trust.
How to use it
- Choose encode or decode.
- Select Base64URL or standard Base64.
- Enter text or an encoded string, then copy the result.
Common use cases
- Encode short text for URL-safe values
- Decode Base64URL examples while debugging
- Compare standard Base64 and Base64URL output
- Check encoded examples while learning web or API formats
- Inspect non-sensitive JWT-style header or payload examples
Base64URL Versus Standard Base64
Base64URL is a URL-safe variant of Base64. It is useful in web contexts where +, /, or = padding can be inconvenient in URLs or tokens.
| Format | Characters | Common use |
|---|---|---|
| Base64 | +, /, and optional = padding | General binary-to-text encoding |
| Base64URL | - and _ instead of + and / | URL-safe strings and web tokens |
| Neither | No secrecy by itself | Encoding is reversible and not encryption |
When to Choose Base64URL
Choose Base64URL when the encoded value needs to travel inside a URL, query parameter, route segment, or token-like string. Choose standard Base64 when another system explicitly expects the standard format.
| Need | Better format | Why |
|---|---|---|
| URL parameter | Base64URL | Avoids + and / characters that can be awkward in URLs. |
| JWT-style learning example | Base64URL | JWT header and payload sections commonly use Base64URL. |
| General file or system exchange | Standard Base64 | Many legacy systems expect standard Base64. |
| Human-readable secrecy | Neither | Both formats are reversible and not encryption. |
Do Not Use Base64 as Security
Base64 and Base64URL are encoding formats. Anyone with the encoded string can decode it, so they should not be treated as privacy protection.
- Do not paste passwords, API keys, access tokens, private keys, or personal records into an encoder you do not trust.
- Use Base64URL for URL-safe examples, not for hiding sensitive data.
- If you are debugging a JWT or API value, remove or mask sensitive parts before sharing screenshots.
FAQ
What is the difference between Base64 and Base64URL?
Base64URL uses URL-safe characters, replacing + and / with - and _, and often omits padding.
Is Base64 encryption?
No. It is reversible encoding and should not be used to protect secrets.
Can I decode a JWT with this?
You can decode non-sensitive Base64URL parts for learning or debugging, but do not paste real access tokens or private data into tools you do not trust.
Is my text uploaded?
No. Encoding and decoding run locally in your browser.