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Online Base64 String Generator

Encode text to Base64 (UTF-8 safe) or decode Base64 back to readable text. Optional URL-safe output and padding removal. Everything runs locally in your browser.

Category: Developer · URL: /tools/online-base64-string-generator.html
Mode
Options
Actions
Tip: Decode accepts both standard Base64 and Base64URL (with or without padding). Whitespace is ignored.
Input
Output
Related tools:
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use it to encode or decode Base64 strings without sending data anywhere.

  1. Select Encode or Decode.
  2. Paste your text/Base64 into the input box.
  3. Optional: enable URL-safe and/or Strip padding.
  4. Click Convert, then Copy output.
Keywords this page targets (natural cluster): online base64 string generator, base64 encode online, base64 decode online, utf-8 base64 encoder, convert text to base64, convert base64 to text, urlsafe base64 encoder, base64url encode, base64url decode, remove base64 padding, add base64 padding, base64 for json, encode unicode to base64, decode base64 to utf8, base64 validator, base64 encoder no padding, base64 decoder with whitespace, base64 online tool, atob btoa unicode alternative, jwt base64 decode, base64 string to bytes, base64 encode textarea
Secondary intents covered: Encode plain text into Base64 for APIs, headers, or configs, Decode a Base64 string back into readable UTF-8 text, Generate URL-safe Base64 (Base64URL) for tokens and URLs, Remove or restore '=' padding for compact Base64 strings, Quickly copy encoded/decoded output for use elsewhere, Troubleshoot invalid Base64 by surfacing decode errors, Swap input/output to iteratively transform values, Handle Unicode characters correctly (non-ASCII text)

FAQ

Is this Base64 generator safe to use with sensitive data?

It runs locally in your browser and does not send input over the network, but always follow your organization’s security policy.

Does it support Unicode (UTF-8) text?

Yes. Encoding uses UTF-8, so non-ASCII characters (like ✓, emoji, or CJK) work correctly.

What is URL-safe Base64 (Base64URL)?

It replaces + with - and / with _, making the string safer inside URLs and JWT parts.

Should I remove '=' padding?

Some systems (like JWT) omit padding; others require it. If decoding fails elsewhere, keep padding or restore it.

Why does decoding fail for my input?

Common causes are invalid characters, wrong length (mod 4 = 1), or truncated data. This tool ignores whitespace and auto-adds missing padding when possible.

Is Base64 encryption?

No. Base64 is just an encoding; anyone can decode it.

Can I decode JWT payloads here?

You can decode individual JWT segments (they’re Base64URL), but for full JWT parsing use the JWT Converter tool linked above.