Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to readable content without leaving the browser. Useful for API debugging, auth headers, data URIs, and quickly checking whether a string is encoded or just looks encrypted.
Last updated: May 1, 2026
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Buy me a coffeeWhat is Base64 Encoder/Decoder?
Base64 is an encoding format that turns binary or text data into a limited ASCII character set so it can move safely through text-based systems. It shows up in API payloads, Basic Auth headers, email attachments, cookies, data URIs, and many debugging workflows where raw binary would not travel cleanly.
Base64 is often confused with encryption, but it does not secure anything. It simply changes representation. This tool is useful because it lets you move in both directions quickly, verify whether a string is valid Base64, and handle UTF-8 text such as emojis or non-English characters correctly.
How to Use Base64 Encoder/Decoder
Paste your text or Base64 string in the input field
Click "Encode" to convert readable text into Base64 output
Click "Decode" to turn a Base64 string back into plain text
Check the error state if the input is not valid Base64 or contains broken padding
Copy the result for use in an API request, header, config file, or debugging session
Common Use Cases
- Developers decoding Base64 payloads from APIs, webhooks, or auth flows to inspect the original content.
- Engineers generating Base64 for HTTP Basic Authentication headers during manual API testing.
- Frontend developers converting image or file content for data URI and inline asset workflows.
- Support teams checking whether a suspicious-looking token or string is merely encoded instead of encrypted.
- Anyone validating UTF-8 text handling before Base64 data is stored in JSON, cookies, or config values.
Example Input and Output
This is a common API debugging flow: verify that a string is only encoded, inspect it, then copy the plain text back into a request or log note.
Authorization: [email protected]:TempPass!2026QXV0aG9yaXphdGlvbjogb3BzQGV4YW1wbGUuY29tOlRlbXBQYXNzITIwMjY=Important distinction
Base64 is reversible encoding, not protection. If the source text is sensitive, the Base64 output should be treated as sensitive too.
Workflow tip
When a decoded value still looks unreadable, check whether it is compressed, encrypted, or another encoded format layered on top of Base64.
Frequently Asked Questions
Does Base64 provide encryption?
No, Base64 is encoding, not encryption. It's easily reversible and provides no security. Never use it to hide sensitive data—anyone can decode it instantly.
Why does Base64 make data larger?
Base64 converts every 3 bytes of input into 4 printable characters, so the output is roughly 33% larger than the original data. That size tradeoff is what makes it safe for text-only channels.
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _ so the encoded value can travel in URLs and filenames more cleanly. Standard Base64 and URL-safe Base64 are closely related, but they are not identical.
Why am I getting an invalid Base64 error?
The most common causes are missing padding, broken copy-paste, whitespace inserted by another system, or a value that only looks like Base64 but is actually another format.
Does this support emojis and non-English text?
Yes. The encoder and decoder handle UTF-8 input, which means accented text, emoji, and many international character sets are preserved correctly.
Is my Base64 data sent to a server?
No. Encoding and decoding happen locally in your browser, which is useful when the data contains private tokens, credentials, or internal API content.
JSON Workflow
Move between formatting, querying, transforming, and converting structured data without losing context.
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