Base64 Encode & Decode Online — Free, No Upload
Encode text to Base64 or decode it back — instantly, in your browser. Nothing is uploaded.
Everything runs in your browser — your input is never uploaded.
How to encode or decode Base64
- 1
Pick a direction
Choose Text → Base64 to encode, or Base64 → Text to decode.
- 2
Type or paste
Enter your text or Base64 in the input box. The result updates as you type.
- 3
Copy or download
Copy the output to your clipboard, or download it as a text file.
Why use this tool
Files never leave your device
Everything runs inside your browser. Nothing is uploaded, stored or seen by anyone but you.
No signup, no watermark
No account, no email, no branding stamped on your output. Free with no daily limit.
Instant — no upload wait
Because there is no round trip to a server, results appear as fast as your device can work.
Works on your phone
Built mobile-first, so you can do this from a phone browser without installing anything.
What Base64 is for
Base64 encodes binary or text data using 64 printable characters, so it can travel safely through systems that expect text — data URIs, JSON, email and HTTP headers. It is an encoding, not encryption: anyone can decode it, so never use it to protect secrets.
Frequently asked questions
- Is my input uploaded anywhere?
- No. Encoding and decoding run entirely in your browser using JavaScript. Your text is never sent to a server, so it is safe to paste sensitive values.
- Does it handle emoji and non-English text?
- Yes. The encoder uses UTF-8, so emoji, accents and non-Latin scripts round-trip correctly through Base64.
- Why does decoding fail sometimes?
- Base64 decoding fails if the input contains characters outside the Base64 alphabet or is truncated. Check for stray spaces or missing padding.
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