Does this tool support international Unicode characters?

Yes. Standard browser btoa() fails on characters outside Latin1 (like emojis, accented characters, and Asian scripts). FreeFileTool uses TextEncoder and TextDecoder to guarantee full UTF-8 compatibility.

Can I convert images or binary files to Base64 data URIs?

Yes. Switch to the File Mode tab to drop any small binary file (PNG, JPG, PDF, SVG, etc.) and convert it into a Base64 string suitable for embedding directly into HTML or CSS.

Is my data safe when decoding credentials or tokens?

Yes. Because conversion occurs entirely in your browser memory, tokens, certificates, and passwords are never transmitted across the network.

Data & Text Tools

Online Base64 Encoder & Decoder

Convert plain text, Unicode strings, and binary files to Base64 and back. Full UTF-8 support, file export, and instant browser-side conversion with zero server tracking.

Plain Text (UTF-8)

Base64 Encoded

Runs entirely in your browser — nothing is uploaded

Safe UTF-8 Encoding

JavaScript's default window.btoa() throws an exception when encountering multibyte characters. FreeFileTool converts strings to UTF-8 byte arrays first, guaranteeing support for emojis, Cyrillic, Chinese, and symbols.

Binary File Embeds

Quickly convert icon graphics, fonts, or configuration files to Base64 strings for embedding directly into CSS stylesheets or HTML documents without hosting external assets.

Private & Offline

Decode sensitive authorization headers, JWT parts, and certificates safely on your device without transmitting credentials over unverified third-party servers.

Online Base64 Encoder & Decoder

File → Base64

Base64 → File Download

Safe UTF-8 Encoding

Binary File Embeds

Private & Offline

Online Base64 Encoder & Decoder

File → Base64

Base64 → File Download

Safe UTF-8 Encoding

Binary File Embeds

Private & Offline

More Data & Text Utilities