Skip to tool
All tools
FeuTex · free tools runs in-browser no bloat built by LiMiT

Online Base64 Generator

Encode to Base64 or decode Base64 back to text (UTF-8). Supports Base64URL, optional padding removal, and decoding with whitespace/newlines. Everything runs locally in your browser.

Category: Developer · URL: /tools/online-base64-generator.html
Input 0 chars
Output 0 chars
Related tools
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this tool to convert between plain text and Base64 (including Base64URL).

  1. Select Encode or Decode.
  2. Paste your value into Input.
  3. (Optional) Enable Base64URL output or remove padding.
  4. Click Convert, then Copy the result.
Keywords this page targets (natural cluster): online base64 generator, base64 encode online, base64 decode online, base64 encoder, base64 decoder, base64url encode, base64url decode, convert text to base64, convert base64 to text, utf8 base64 encoder, decode base64 to utf8, encode unicode to base64, base64 without padding, remove base64 padding, add base64 padding, base64 validator online, btoa atob tool, base64 whitespace tolerant decode, copy base64 to clipboard, jwt base64url helper
Secondary intents covered: Encode a string to Base64 for safe transport or embedding, Decode a Base64 string back to readable UTF-8 text, Generate Base64URL output for JWT and URL contexts, Remove or restore padding (=) depending on API requirements, Validate and troubleshoot invalid Base64 input errors, Handle Unicode characters correctly (not just ASCII), Copy the encoded/decoded result quickly, Swap input/output to round-trip values during debugging

FAQ

Does this tool support Unicode (UTF-8) text?

Yes. Encoding uses UTF-8, so characters like ✓ and non‑Latin text work correctly.

What is Base64URL and when should I use it?

Base64URL replaces + and / with - and _ and often omits padding; it’s common in JWTs and URLs.

Why do I see an “invalid Base64 length” or decode error?

The input may be truncated, contain invalid characters, or have the wrong padding; try enabling “Ignore whitespace” and ensure the string is complete.

Can I decode Base64 that contains spaces or newlines?

Yes. With “Ignore whitespace” enabled, line breaks and spaces are removed before decoding.

What does padding (=) mean and can I remove it?

Padding makes Base64 length a multiple of 4; some systems allow omitting it, and the decoder can usually restore it automatically.

Is my data uploaded to a server?

No. The conversion happens locally in your browser; the tool does not send network requests.

How is this different from the “Online Base64 String Generator (Encode/Decode)” tool?

This page focuses on fast text ↔ Base64 conversion with URL-safe and padding options; the other tool may include additional presets or variations.