Encode or decode Base64 strings
The MailDrop Base64 encoder and decoder converts text to and from Base64 directly in your browser. Paste plain text and encode it into a compact, transport-safe string, or paste an existing Base64 string and decode it back to the original. The tool is fully UTF-8 safe, so accented characters, non-Latin scripts, and emoji survive a round trip intact instead of coming back as mangled bytes.
Base64 shows up everywhere in day-to-day development and debugging. Email attachments, data URIs, basic authentication headers, JSON web tokens, and configuration secrets are all commonly carried as Base64. Being able to decode a string quickly tells you what a token or parameter really contains, and encoding lets you prepare payloads for APIs and embed small assets without hunting for a command-line utility or writing throwaway code.
Everything runs client-side in JavaScript, so nothing you paste is uploaded, logged, or stored. The tool is free and requires no registration, and it complements MailDrop temporary email when you are inspecting encoded links and headers from messages in a disposable inbox.
Enter plain text if you want to encode it, or paste an existing Base64 string if you want to decode it. Both directions are available on the same page, so you can move back and forth freely.
Click Encode to turn readable text into Base64, or Decode to recover the original text from an encoded string. Input that is not valid Base64 is flagged instead of silently producing broken output.
The converted output appears immediately. Because the tool handles UTF-8 correctly, multibyte characters such as Chinese text, Arabic script, or emoji decode back exactly as they were entered.
Copy the result to your clipboard and paste it wherever it is needed: an HTTP header, an API request body, a data URI, an environment variable, or a quick note while debugging.
Base64 represents arbitrary binary data using only 64 safe ASCII characters, which lets binary content travel through channels designed for plain text. It is used in email attachments, data URIs for inline images, HTTP basic authentication, JSON web tokens, and countless APIs and configuration formats that need text-only payloads.
No. Base64 is an encoding, not encryption, and anyone can reverse it instantly with a tool like this one. It provides zero confidentiality, so never treat a Base64 string as a way to hide passwords or secrets. If you need real protection, use proper encryption and keep the keys out of the data.
No. Encoding and decoding happen entirely in JavaScript inside your browser. Nothing you type or paste is transmitted, stored, or logged anywhere. You can verify this by loading the page, going offline, and using the tool normally; it continues to work without a connection.
The browser's native btoa function only handles single-byte characters, so naive tools throw errors or corrupt anything outside basic ASCII. This tool converts text to UTF-8 bytes before encoding and back after decoding, so multibyte characters, accents, and emoji survive the round trip without damage.
Verification emails and marketing messages often carry Base64-encoded tokens in their links and headers. Reading that mail in a MailDrop disposable email inbox and decoding anything suspicious here lets you see what identifiers a sender embedded before you click, keeping your primary address and habits out of tracking systems.