Developer
Base64 Encoder & Decoder
- Browser-based
- No signup
Browser-based
Convert text to Base64 or decode Base64 back to text. Encoding uses UTF-8, and decoding accepts standard or URL-safe Base64. Results update live and stay in your browser.
How to use this tool
1. Choose Encode or Decode mode. 2. Paste input text or Base64 into the editor. 3. Read the output in the results panel. 4. Use Copy to copy the result, or Use result as input to chain operations. 5. Click Clear to start over.
Worked example
Example: encode Hello gives SGVsbG8=; decoding SGVsbG8= returns Hello.
Common examples
- UTF-8 email header value → Base64 for debugging MIME parts.
- Small JSON claim → Base64 segment inspection before JWT assembly.
- Data URL prefix stripped → decode image bytes from `data:image/png;base64,...` payloads.
Common searches
- base64 encode decode
- base64 encoder online
- base64 decoder
- encode string base64
- base64 converter
How it works
Choose Encode or Decode, then paste or type text. Encoding converts UTF-8 text to standard Base64. Decoding accepts standard or URL-safe Base64 (with optional whitespace) and returns the original text. All processing runs in your browser.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Important notice
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Frequently asked questions
Can I encode Unicode text?
Yes. Text is encoded as UTF-8 before Base64 conversion, so characters like accents and emoji are supported.
Does decoding support URL-safe Base64?
Yes. Decoding accepts standard Base64 and URL-safe variants that use - and _ instead of + and /. Whitespace is ignored.
Is my text stored?
No. Encoding and decoding run locally in your browser and text is not stored.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related tools
Related pages
- Encoding tools — compare developer tools and read FAQs
- Debug a JWT or API token — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
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- URL Encoder/Decoder — Encode or decode URL-safe text.
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