πŸ”“ Decoder

Base64
Decoder

Decode Base64 strings back to plain text, HTML, JSON, or preview Base64-encoded images. Supports standard and URL-safe Base64.

Decode text & binary
Image preview
Auto-detect type
Never leaves your browser
Base64 Input
Decoded Output
πŸ–Ό Image Preview
Base64 image preview
Input chars: 0  |  Decoded bytes: 0  |  Type: β€”
Info

What is Base64?

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Encoding Scheme

Base64 converts binary data to ASCII text using 64 safe characters β€” A–Z, a–z, 0–9, +, and /.

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Common Uses

Used in email attachments (MIME), data URIs for images, JWT tokens, and API payloads.

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URL-safe Variant

URL-safe Base64 replaces + with - and / with _ to avoid breaking URLs.

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Size Overhead

Base64 adds ~33% overhead β€” every 3 bytes become 4 characters.