🔓 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
🖼 Image Preview
Input chars: 0 |
Decoded bytes: 0 |
Type: —
Info
What is Base64?
📦
Encoding Scheme
Base64 converts binary data to ASCII text using 64 safe characters — A–Z, a–z, 0–9, +, and /.
📧
Common Uses
Used in email attachments (MIME), data URIs for images, JWT tokens, and API payloads.
🔗
URL-safe Variant
URL-safe Base64 replaces + with - and / with _ to avoid breaking URLs.
📏
Size Overhead
Base64 adds ~33% overhead — every 3 bytes become 4 characters.