Base64 Encoder & Decoder
Base64 Encoder & Decoder lets you convert plain text to Base64 and back — free online, directly in your browser, with no sign-up and no upload. Type or paste your input and the result appears instantly. Ideal for debugging JWT tokens, embedding data URIs, decoding Basic Auth headers, and inspecting API payloads.
No sign-up required. Everything runs in your browser — your text never leaves your device.
How to Encode and Decode Base64 Online (3 Easy Steps)
- Choose a mode at the top — Encode to convert text to Base64, or Decode to reverse Base64 back to plain text.
- Type or paste your text into the left input field. The result updates instantly in the right field.
- Click Copy to put the result on your clipboard, ready to paste into your code, terminal, or API tool.
- Use Swap to move the output back into the input field — handy for round-trip testing.
- Hit Clear to start over at any time.
Why Encode Text in Base64? (And When You Need To)
- 100% Private — All encoding and decoding happens in your browser. Your text never reaches a server.
- Instant Results — Auto-converts as you type, no “Process” button needed.
- Full Unicode Support — Works with emojis, accents, and non-Latin scripts (Chinese, Arabic, Japanese).
- Clear Error Messages — Pasting invalid Base64? You’ll see exactly what went wrong.
- Cross-Platform — Works on desktop, tablet, and mobile browsers. No installation, no extension.
Base64 Encoder — Frequently Asked Questions
Yes, completely free — no sign-up, no watermark, no usage limits. Encode and decode as much text as you like with no hidden costs or restrictions.
Yes. Base64 Encoder runs entirely in your browser — nothing is uploaded or stored on a server. Your text and files stay private on your device.
Any plain text — including UTF-8 characters, emojis, JSON, source code, API keys, and credentials. The tool also supports Base64 decoding back to readable text.
Yes, Base64 Encoder works on all modern mobile browsers. No app install needed — encode and decode directly on your phone or tablet just like on desktop.
Base64 is used to safely transmit binary data over text-only systems — email attachments, embedding images in CSS or HTML (data URIs), API authentication headers (Basic Auth), JWT tokens, and JSON payloads carrying binary fields.
No. Base64 is encoding, not encryption. Anyone can decode a Base64 string back to its original content with no key required. Never use Base64 to hide passwords or sensitive data — use proper encryption instead.
Base64 represents every 3 bytes of input as 4 characters of output, so the encoded text is roughly 33% larger than the original. Padding characters (=) may add 1–2 more bytes.
Yes. The tool encodes and decodes full UTF-8, including non-Latin scripts (Chinese, Arabic, Japanese), accents, and emojis — they round-trip without corruption.