Convert PNG to Base64 Data URI Online - Free, Local & Instant
Convert PNG (image/png) to Inline Base64 Data URI String (.txt) locally in your browser using HTML5 Canvas. Adjust compression quality, resize in pixels, and download instantly with zero server uploads.
Technical Comparison: PNG vs Base64 Data URI
Images & Game/Web Assets| Specification | PNG (Source) | Base64 Data URI (Target) |
|---|---|---|
| Format Name | Portable Network Graphics | Inline Base64 Data URI String |
| MIME Type | image/png | text/plain |
| Transparency / Alpha | Yes (full RGBA transparency) | Preserved for PNG, WEBP, AVIF, ICO, SVG, BMP |
| Compression Profile | Lossless DEFLATE | zero-HTTP-request inline data:image/...;base64 string for HTML, JSON, or JS bundles |
| Processing Engine | Native Browser Image Decoder | HTML5 Canvas + Client-Side Binary Encoder |
PNG to Base64 Data URI — Before & After Example
Input File: asset.png MIME Type: image/png Alpha: Yes (full RGBA transparency) Compression: Lossless DEFLATE Decoding: Browser HTML5 Image + Canvas 2D Context
data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoQAAoAAUAmJaQAA3AA/vuUAAA=
Frequently Asked Questions: PNG to Base64 Data URI
Does converting PNG to Base64 Data URI upload my images to a remote server? ▾
Never. Every PNG file you select is decoded directly in your browser using the HTML5 Canvas API and FileReader API. Your images stay in your computer or phone RAM at all times.
Can I resize and adjust compression quality when converting PNG to Base64 Data URI? ▾
Yes. Use the Quality slider (10%–100%) and the Width/Height pixel inputs above the drop zone. Keeping "Lock Ratio" checked preserves your original aspect ratio automatically.
Does this converter support batch PNG to Base64 Data URI conversion with ZIP download? ▾
Yes. Drag and drop multiple PNG files at once; you can download each converted Base64 Data URI individually or click "Download All (.ZIP)" to bundle them locally via JSZip.
Why use Base64 Data URI instead of PNG? ▾
Converting PNG to Base64 Data URI gives you zero-HTTP-request inline data:image/...;base64 string for HTML, JSON, or JS bundles while keeping full control over pixel dimensions and byte size.