Encode and decode Base64 instantly with a privacy-first tool that runs locally in your browser. Convert text or binary-safe strings for APIs, JWTs, and data transfer without uploading anything.

This page is the canonical Base64 encoder/decoder for DevTools360 and is updated regularly to keep encoding behavior consistent.

1. Paste text or Base64: Add content to the input editor.
2. Auto-detect: The tool suggests encode or decode.
3. Convert: Click Encode/Decode to update the output.
4. Copy: Export the result for API or config use.

Input text:

hello world

Base64 output:

aGVsbG8gd29ybGQ=

Base64 encoding works by taking binary data and converting it into a string of ASCII characters. Each Base64 character represents 6 bits of data, meaning every 3 bytes (24 bits) of input becomes 4 Base64 characters. The encoding process ensures that binary data can be safely transmitted through systems that only support text.

• APIs and Web Services: Encoding binary data in JSON responses, embedding images or files in API payloads
• JWT Tokens: Base64URL encoding is used in JSON Web Tokens for encoding header and payload sections
• Email Attachments: MIME encoding uses Base64 to attach binary files to emails
• Data URIs: Embedding images directly in HTML/CSS using data URIs (data:image/png;base64,...)
• Database Storage: Storing binary data in text-based database fields
• HTTP Basic Authentication: Encoding username:password credentials
• Configuration Files: Encoding certificates, keys, and other binary data in config files

• Missing padding: Add = characters if required by your decoder.
• URL-safe Base64: Convert - and _ back to + and / if needed.
• Invalid characters: Remove whitespace or non-Base64 symbols.
• Unicode issues: Ensure UTF-8 encoding for non-ASCII text.

It's important to understand that Base64 is encoding, not encryption. Encoding transforms data format for transmission or storage, but it does not provide security. Anyone can decode Base64 data without a key. For security, use encryption algorithms like AES, RSA, or other cryptographic methods.

Our Base64 encoder/decoder fully supports UTF-8 encoding, which means it can handle Unicode characters including emojis, international characters, Chinese, Japanese, Arabic, and other special symbols. The tool properly encodes and decodes UTF-8 strings, ensuring your data remains intact throughout the encoding/decoding process.

• JWT decoder to inspect base64url payloads.
• URL encoder/decoder for safe query string encoding.
• JSON viewer to inspect decoded JSON payloads.

All Base64 encoding and decoding operations happen entirely in your browser using JavaScript. Your data never leaves your device, is never sent to any server, and is never stored. This privacy-first approach ensures that sensitive information like passwords, API keys, or personal data remains completely private and secure.

• RFC 4648 - The Base16, Base32, and Base64 Data Encodings

Maintained by the DevTools360 team. Last updated: 2026-01-15. We focus on fast, reliable encoding and decoding for real-world API and tooling workflows.