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Base64 Encoder / Decoder

Convert UTF-8 text, Base64 Data URLs or local files without uploading the payload.

Local execution receiptinput path disclosedTool content stays out of MonoTools URLs and API requests.
Working input
Browser memory
Cross-tool handoff
Session only · 10 min
URL payload
Never
Export
Explicit action

Verify it: open DevTools Network, clear the log, use the tool, then inspect fetch/XHR requests. Page assets and optional aggregate analytics may use the network; tool input is not included.

Full privacy model
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How to use

  1. 01Choose Text or File mode, then enter text, paste a Data URL or open a local binary file.
  2. 02Pick Encode or Decode and choose strict or forgiving validation when decoding.
  3. 03Review MIME, byte and charset evidence, then copy the text result or download decoded bytes.
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FAQ

Does it support Unicode?
Yes. The encoder uses UTF-8 so emoji and non-Latin scripts round-trip correctly.
What is Base64 used for?
Base64 is commonly used to embed binary data inside text formats such as JSON, XML, JWT tokens, data URIs and email (MIME).
Is Base64 encryption?
No. Base64 is reversible encoding, not encryption. Anyone can decode a Base64 string. Never use it to protect secrets.
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