Free Base64 Encoder/Decoder Online
Encode & Decode Text Instantly
A free online Base64 encoder and decoder that converts text to and from Base64 instantly — right in your browser, with full Unicode support for English and Tamil text. Nothing ever leaves your device.
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Why use StudyHelpAI's Base64 Encoder/Decoder
Free Online Base64 Encoder and Decoder
Looking for a reliable Base64 encoder decoder online? This free tool converts text and files to and from Base64 in one click — useful for Computer Science students learning about data encoding, and for developers embedding small images as data URIs or debugging encoded API payloads.
Unlike most online Base64 decoder tools, this one runs entirely in your browser using JavaScript — nothing is uploaded to a server, so it's safe to encode or decode text and files containing real content, including images.
As a completely free Base64 encoder, there's no signup and no daily limit — paste your text or drop a file, and get the result instantly.
Note: Base64 is an encoding, not encryption — anyone can decode Base64 text back to its original form. Don't rely on it to keep sensitive information private.
← Explore more free developer toolsFrequently Asked Questions
Yes — this tool is completely free to use, with no signup and no daily limit. Encode or decode as much text or as many files as you like.
No. This tool runs entirely in your browser using JavaScript — your text and any files you choose are never sent to a server. That makes it safe to encode or decode real, sensitive, or private content.
No. Base64 is just a way to represent binary data as text — it is not encryption and provides no security. Anyone can decode Base64 text back to its original content, so never use it as a substitute for encrypting sensitive information.
Yes — this encoder correctly handles Unicode text, including Tamil script, unlike some basic Base64 tools that only work reliably with plain English (ASCII) text.
Yes — use the file upload option to convert an image or small file directly into a Base64 data URI, which you can paste straight into an HTML <img> tag's src attribute or a CSS background-image property.
This usually means the text you pasted isn't valid Base64 — it may be missing characters, contain extra spaces or line breaks in the wrong place, or actually be plain text that was never encoded in the first place.