The first time I needed Base64, I was embedding a small logo directly into an HTML email so it would survive image-blocking. A developer friend said ‘just base64 it’ like that was a complete sentence. It was not. Here is the complete sentence: Base64 turns binary data (images, files) into plain text characters so it can travel through systems that only handle text, emails, JSON payloads, data URLs, config files.
Encoding: paste text or drop in a file, copy the output. Decoding: paste a Base64 string, get the original back. That is the whole workflow, and doing it in the browser means your data never leaves your device, which matters when the string you are decoding is an API key or an auth token. I never paste credentials into random server-side tools; in-browser only.
Try it now: open the free tool, runs 100{e0bed9560a59d6d3feee569f5ae3dad3ee14a646b3fccc2d16becbf099999e03} in your browser.
Three things worth knowing: Base64 output is roughly 33{e0bed9560a59d6d3feee569f5ae3dad3ee14a646b3fccc2d16becbf099999e03} larger than the input, so do not embed huge images this way. It is encoding, not encryption, anyone can decode it, so never treat it as security. And watch for URL-unsafe characters (+, /, =) when putting Base64 in URLs; that is what the URL-safe variant exists for.
Bottom line: encode to transport, decode to inspect, never confuse it with encryption.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use Base64 Encoder & Decoder?
Open the Base64 Encoder & Decoder in your browser (Encode or decode Base64 text instantly). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste or type the value you want converted into the input box.
- Pick the units or format you are converting between.
- Read the converted result and copy it with the copy button.
Try Base64 Encoder & Decoder free. It opens right in your browser.