Online Base64 Viewer & Data URI Decoder
Decode, preview, and inspect Base64 strings and Data URIs directly in your browser. Instant image rendering, PDF extraction, text decoding, and 100% in-memory client privacy.
The Complete Guide to Base64 (RFC 4648) & Data URI Schemes in Modern Web Development
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. Standardized under RFC 4648, Base64 is designed to transport data stored in binary formats across channels that only reliably support text content (such as email via MIME, JSON API payloads, and inline CSS/HTML Data URIs).
Web developers frequently encounter Base64 strings when embedding small icons directly into CSS stylesheets or receiving image uploads from frontend canvas elements. The HiFi Toolkit Online Base64 Viewer parses these strings and instantly renders the underlying image, PDF document, or text payload.
Common MIME Types Supported by Base64 Viewers
image/png, image/jpeg, image/webp, image/gif.image/svg+xml for crisp responsive web icons.application/pdf, text/plain, application/json.How to View and Decode Base64 Strings Online
- Paste Data: Paste your raw Base64 string or Data URI in the left text area.
- Instant Preview: The right panel automatically detects the MIME type and displays the decoded content.
- Download File: Click Download File to save the decoded asset to your device.
