Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
About this tool
Base64 converts binary or text data into a safe set of 64 ASCII characters, which is why it is used everywhere in web development: data URLs, basic auth headers, email attachments and API payloads. This tool encodes text to Base64 and decodes Base64 back to readable text instantly, entirely in your browser.
How to use
- 1 Paste your text (or a Base64 string).
- 2 Click Encode or Decode.
- 3 Copy the converted output.
Why use this tool
- Both directions in one tool: encode and decode.
- Essential for debugging APIs, JWTs, data URLs and email content.
- Local processing keeps sensitive strings private.
Frequently asked questions
Is Base64 encryption?
No — it is encoding, not encryption. Anyone can decode Base64, so never use it to protect secrets.
Why does Base64 output end with = signs?
The = characters are padding added when the input length is not a multiple of three bytes; they are a normal part of valid Base64.
Why is Base64 data larger than the original?
Base64 represents every 3 bytes as 4 characters, so encoded data is about 33% larger than the input.
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By the SkillNexy Team · Last updated: 2026-07-12 · 100% free · Runs locally in your browser — nothing is uploaded.