Base64 Converter

A Base64 converter is a tool that encodes plain text or binary data into Base64 format, or decodes Base64 strings back to their original content. Base64 uses 64 printable ASCII characters to safely represent binary data in text-based systems like email, JSON, HTML, and URLs.

Paste or type your text into the input area above and select 'Encode'. The tool instantly converts your text to a Base64 string using UTF-8 encoding. You can then copy the result or download it.

Switch to the 'Decode' tab, paste your Base64 string, and the tool will instantly decode it back to readable text. It handles standard Base64, URL-safe Base64, and padded/unpadded strings.

No. Base64 is an encoding format, not encryption. Anyone can decode a Base64 string instantly — it provides zero security. Use AES, RSA, or other cryptographic algorithms for actual data protection.

You can convert any file type to Base64 — images (PNG, JPG, SVG), documents (PDF), audio (MP3, WAV), video (MP4), and more. Use our File to Base64 tool for binary files, or Image to Base64 for images with data URI output.

Yes. Base64 encoding increases data size by approximately 33%. Every 3 bytes of input produces 4 Base64 characters. This overhead is the trade-off for being able to safely represent binary data as text.

URL-safe Base64 (Base64URL) replaces the + and / characters with - and _ so the encoded string can be safely used in URLs, cookies, and filenames without additional encoding. JWT tokens use this variant.

Yes. All conversion happens entirely in your browser using JavaScript. Your data is never uploaded to any server, making this tool completely private and secure. It even works offline.