Base64 Encoder & Decoder Online
Convert text to Base64, or decode Base64 back to text — instantly, entirely in your browser.
Text to encode
Never uploaded
Encoding and decoding both happen entirely in your browser — your text never touches our servers.
Unicode-safe
Accented letters, non-Latin scripts, and emoji all round-trip correctly via UTF-8.
Free, no limit
No account, and no limit on how much text you can convert.
What is Base64 Encoding?
Base64 is a way of representing binary or text data using only 64 plain-ASCII characters (A–Z, a–z, 0–9, +, /, with = for padding), so it can safely travel through systems that only handle text — embedding a small image directly in CSS or HTML, including binary data in a JSON or XML payload, or attaching data to a URL. It is not encryption: anyone can decode Base64 back to the original data with no key required.
How to Encode or Decode Base64 Online
- Choose a mode. "Encode" converts plain text into Base64; "Decode" converts Base64 back into plain text.
- Paste your input. Type or paste the text (for Encode) or the Base64 string (for Decode).
- Read the result. The conversion happens instantly as you type — no button to click.
- Copy or download. Use the Copy button to copy the result to your clipboard, or Download to save it as a .txt file.
Base64 Is Not Encryption
A common misconception is that Base64 hides or protects data. It doesn't — Base64 is a reversible encoding, not a cipher, and any Base64 string can be decoded back to its original form by anyone, instantly, with no password. Use Base64 for data-format compatibility (making binary data safe to embed in text-only formats), and use real encryption for anything that needs to stay confidential.
Frequently Asked Questions
How do I encode text to Base64?
Paste or type your text into the input box with Encode selected — the Base64 result appears instantly below. Switch to Decode to convert Base64 back to text.
What is Base64 used for?
Base64 turns arbitrary data (text, binary, images) into a plain-ASCII string so it can safely travel through systems that only handle text, like embedding a small image in CSS/HTML, or including binary data in JSON, XML, or a URL.
Is Base64 encoding the same as encryption?
No. Base64 is not encryption or a security measure — it's reversible by anyone using any Base64 decoder, with no key required. Use it for data-format compatibility, not for protecting sensitive information.
Does it support Unicode and emoji?
Yes — text is UTF-8 encoded before Base64 conversion, so accented letters, non-Latin scripts, and emoji all round-trip correctly.
What happens if I paste invalid Base64 into Decode?
You'll see a clear error message rather than garbled output or a silent failure — Base64 decode requires the input to be validly formatted.
Is my text uploaded anywhere?
No. Encoding and decoding both run entirely in your browser — your text is never sent to CurePDF's servers.
Is the Base64 encoder/decoder free?
Yes, with no account required and no limit on how much text you can convert.
Can I copy or download the result?
Yes — use the Copy button to copy the result to your clipboard, or Download to save it as a .txt file.