What is URL-safe Base64?

A variant that replaces '+' with '-' and '/' with '_' so values are safe in URLs and filenames. Padding '=' may be omitted.

Can I paste a Data URL directly?

Yes. Paste strings like data:image/png;base64,iVBOR… - the tool detects and decodes them, infers MIME type, and lets you download the bytes.

Is my data uploaded anywhere?

No. Everything runs locally in your browser. Nothing is sent to a server.

Base64 Encoder/Decoder

🔒 Offline 🧰 Text & File 🧾 Data URL 🌐 URL-safe ✂ Wrap 76

Encode or Decode

Mode

URL-safe Variant

Padding "="

Line Wrap

Output as Data URL

Input

Tip: Drag & drop a file below to encode it, or paste a Data URL to decode.

Drop a file (optional)

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What is Base64?

Base64 encodes binary data as text using 64 symbols (A-Z, a-z, 0-9, +, /). It's common in data URLs, email (MIME), JSON embedding, and URL tokens. Use URL-safe when embedding in URLs.

Spec: RFC 4648. For email/MIME wrapping guidance, see RFC 2045.

Base64 Encoder/Decoder

Encode or Decode

What is Base64?

60-second explainer 🎥