Base64 Encoder & Decoder
Encode or decode Base64 for text, files, and images — standard or URL-safe, with MIME line wrapping — instantly and entirely in your browser.
Frequently Asked Questions
What is Base64 used for?
Base64 encodes binary data as printable ASCII text, commonly used to embed images in CSS/HTML as data URIs, encode data in URLs, attach files to emails (MIME), or pass binary data through text-only APIs and config files.
Is Base64 encryption?
No — Base64 is an encoding, not encryption. It provides zero confidentiality; anyone can decode it instantly. Never use it to protect sensitive data.
What's the difference between standard and URL-safe Base64?
Standard Base64 uses '+' and '/', which have special meaning in URLs and file paths. URL-safe Base64 (used in JWTs and web tokens) replaces them with '-' and '_' so the output can be used directly in a URL or filename without escaping.
Can I encode files and images, not just text?
Yes — switch to the File / Image input, drop in any file, and it's converted to Base64 locally. For images, you also get a one-click 'Copy as Data URI' button to paste straight into CSS or HTML.
Does this support Unicode text?
Yes — this tool UTF-8 encodes text before Base64 conversion, so emoji, accented characters, and non-Latin scripts round-trip correctly.
What happens if I decode binary data, like an image?
If the decoded bytes aren't valid UTF-8 text, the tool detects common image formats (PNG, JPEG, GIF, WEBP, BMP, ICO) and shows a live preview, plus a Download button to save the raw bytes as a file.
Are my files or text ever uploaded to a server?
No — every conversion runs locally in your browser using the built-in File and TextEncoder APIs. Nothing you type or upload ever leaves your device.
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