Base64 Encoder / Decoder

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Encode text to Base64 or decode Base64 back to text in one click. Full UTF-8 support handles emoji and non-Latin scripts, and URL-safe mode produces output you can drop straight into URLs and filenames.

Runs in your browser. Nothing is uploaded. Base64 is encoding, not encryption.

How the Base64 Tool Works

The tool uses native browser functions with proper UTF-8 handling for accurate two-way conversion.

  1. Pick a mode, choose Encode to convert text to Base64 or Decode to read Base64 back.
  2. Paste your input, the tool encodes text as UTF-8 first so Unicode and emoji survive.
  3. Optional URL-safe, swap plus and slash for minus and underscore and trim padding for URLs.
  4. Copy the result, one click copies the output, and you can feed it straight back in to chain conversions.

When You Need Base64

Base64 shows up constantly in web development and integrations.

  • Data URIs, inline small images, fonts, or SVGs directly in CSS or HTML.
  • APIs and JSON, transport binary-ish data safely inside text-only payloads.
  • Tokens and headers, decode Base64 segments of JWTs and basic auth headers for debugging.
  • Email and webhooks, encode attachments and signatures that must pass through text channels.

Security note: Base64 is reversible by anyone. Never use it to protect passwords, API keys, or personal data.

Next steps

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Base64 Encoder / Decoder: FAQ

What is Base64 encoding?
Base64 is a way to represent binary or text data using 64 ASCII characters (A-Z, a-z, 0-9, plus, slash, with equals padding). It lets data that may contain unsafe bytes travel safely through systems that expect text, such as URLs, JSON, email, and data URIs.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode it instantly, so it provides no security. Never use Base64 to hide passwords, tokens, or secrets. Use proper encryption for sensitive data.
What is URL-safe Base64?
URL-safe Base64 replaces the plus and slash characters with minus and underscore and often drops the equals padding, so the result is safe to place in URLs and filenames without further escaping. Toggle URL-safe mode to switch.
Does this tool support Unicode and emoji?
Yes. Text is encoded as UTF-8 before Base64 conversion, so accented characters, non-Latin scripts, and emoji are preserved correctly in both directions.
Why do I get an error when decoding?
Decoding fails when the input is not valid Base64, for example if it contains spaces, line breaks in the wrong place, or characters outside the Base64 alphabet. Remove stray characters and try again.
Can I encode a data URI for an image?
You can encode text and produce Base64 here. For images, this tool encodes pasted text, not files. For image to WebP and compression, use our image compressor tool.
Is my data sent to a server?
No. Encoding and decoding run entirely in your browser using native functions. Nothing you paste is uploaded to Web Aloha servers.
Is this Base64 tool free?
Yes. It is free, private, requires no signup, and works on desktop and mobile.

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