Encode plain text into Base64 or decode a Base64 string back into text. UTF-8 safe, handles emojis and non-Latin scripts correctly.
Browser-native btoa/atoa silently fail on non-Latin characters. Our encoder uses TextEncoder so any input round-trips perfectly.
Base64 converts binary data into ASCII text so it can travel through systems that only accept text, email, JSON fields, data URLs and JWT tokens all use it. Developers encode images inline for small icons and decode API payloads that return Base64 strings.
Base64 is not encryption. Anyone can decode it. Never treat Base64 as security. It is a transport encoding, not a way to hide secrets.
Text in languages beyond ASCII, including Urdu, Arabic and emoji, requires UTF-8 aware encoding. A broken encoder mangles multibyte characters into question marks. Synctoolo handles UTF-8 end to end so your decoded text matches what you encoded.
When embedding images as data URLs in HTML or CSS, watch file size. Base64 expands data by roughly 33 percent. For large assets, use a CDN URL instead of inline encoding.
Base64 encodes every 3 bytes as 4 characters, a ~33% size increase. That's the trade-off for safe text representation of binary data.
No, it's encoding. Anyone can decode Base64 instantly. Never use it to hide passwords, tokens or secrets.
Padding. Base64 outputs come in multiples of 4 characters; one or two '=' signs are added when the input length isn't a multiple of 3.
Yes. We accept both standard and URL-safe (-/_ instead of +//) variants and normalise them before decoding.