Base64 Encoder/Decoder — Text & File Support

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URL-safe (-_ no padding) Wrap as Data URI (files)

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How Does A Base64 Encoder/Decoder Work?

Base64 encoding converts binary data or text into a string of 64 safe ASCII characters (A-Z, a-z, 0-9, +, /), making it possible to embed images, files, or arbitrary bytes inside text-based formats like JSON, XML, HTML, CSS, and URLs. This tool uses your browser's native btoa() and atob() functions combined with UTF-8-aware TextEncoder/TextDecoder logic, so encoding and decoding happen instantly on your device with zero server upload.

This free Base64 converter supports plain text, full Unicode (including emoji and non-Latin scripts), and any file type, including images, PDFs, and documents, entirely inside your browser.

Why btoa() And atob() Break On Unicode (And How This Tool Fixes It)

JavaScript's native btoa() and atob() functions only understand Latin-1 characters and throw errors on emoji, Chinese, Arabic, or accented text. This tool avoids that trap by converting your text to raw UTF-8 bytes with TextEncoder before encoding, and decoding back to UTF-8 with TextDecoder, so multi-byte characters like "café" or "😀" always convert correctly without corruption.

Standard Base64 vs URL-Safe Base64

Standard Base64 uses the characters + and / along with = padding, which works fine in text files and JSON but can break when placed directly inside a URL or filename. URL-safe Base64 replaces + with - and / with _, and typically omits the = padding entirely, making it the required format for JWTs, OAuth tokens, and Base64 data embedded in query strings. This tool includes a one-click URL-safe toggle to switch between both formats instantly.

Encoding Files & Images To Base64

Beyond plain text, this tool lets you drag and drop or upload any file, including PNG, JPG, PDF, or any binary file, and converts it into a Base64 string using the browser's FileReader API. Enable the Data URI toggle to automatically wrap the result as a complete data:image/png;base64,... string, ready to paste directly into HTML, CSS, or JSON without any extra formatting.

Common Uses For A Base64 Encoder/Decoder

This free Base64 converter is commonly used to embed small images directly into CSS or HTML without extra HTTP requests, decode JWT tokens and API responses, prepare binary attachments for email or JSON payloads, encode credentials for HTTP Basic Authentication headers, and convert files to text-safe strings for storage in databases or config files that don't support raw binary data.

Base64 Keywords And Related Searches Worldwide

People discover this tool by searching base64 encode, base64 decode, base64 converter, base64 to text, text to base64, base64 to image, base64 file encoder, base64 URL safe, atob btoa online, and base64 to PDF. This tool is used by developers, API testers, and IT professionals across the United States, United Kingdom, Canada, Australia, India, and worldwide for fast, reliable, browser-based encoding.

Frequently Asked Questions