Writer & Dev
Base64 Image Decoder: Preview and Inspect Data URIs Online
Paste a data URI to preview the decoded image and see its MIME type, encoded length and real byte size. You can also drop a local file in to generate a data URI without uploading anything.
Runs in your browser — your text is never uploaded or stored.
Quick answer
Base64 Image Decoder & Data URI Inspector is a free online tool that paste a data URI to preview the decoded image and see its MIME type, encoded length and real byte size. You can also drop a local file in to generate a data URI without uploading anything.
- Cost: free, no signup or limits.
- Privacy: runs 100% in your browser; text is never uploaded.
- Works on: desktop and mobile browsers, offline once loaded.
- Category: Writer & Dev.
Files are read locally — never uploaded.
- MIME type
- image/svg+xml
- Base64 encoded
- Yes
- Decoded size
- 116 B
- URI length
- 182 chars
- Overhead
- 57%
How to Use
- 1.Paste a data: URI, or pick a local image file to encode.
- 2.Read the MIME type, base64 flag and decoded byte size in the details panel.
- 3.Preview the image and copy the data URI or the raw base64 payload.
Advertisement
FAQ
Is my image uploaded?
No. Files are read with the browser FileReader API and never leave your device.
Why is the data URI bigger than the file?
Base64 encoding adds roughly 33% overhead, so a 30 KB image becomes about 40 KB of text.
Which formats can I preview?
Any image type your browser renders — PNG, JPEG, GIF, WebP, AVIF and SVG.
Related tools
Base64 Encode/Decode
Encode text to Base64 or decode a Base64 string back to text. UTF-8 safe, free, and runs 100% in your browser.
URL Encode / Decode
Free online URL encoder and decoder. Percent-encode any string for safe use in URLs or decode %-encoded text back to plain characters. 100% browser-based.
Hash Generator (SHA-256, SHA-512)
Free online SHA hash generator. Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes for any text using the Web Crypto API — nothing leaves your browser.
HTML Entity Encoder / Decoder
Free HTML entity encoder and decoder. Escape <, >, &, quotes and Unicode into HTML entities — or decode entities back to plain text. Runs in your browser.