New to binary-to-text encoding? Read What Is Base65 Encoding and When Should You Use It? for a full explainer on Base64 alphabets, URL-safe variants, data URLs, and when encoding helps or hurts performance.
How to convert an image to Base64
Base64 encoding represents binary image data as ASCII text. Developers embed small icons in CSS, inline images in HTML email, or attach previews in JSON without hosting a separate file. This tool reads your image locally and outputs a ready-to-paste data URI.
- Upload an image — select JPG, PNG, WebP, GIF, or BMP from your device.
- Generate Base64 — click the primary action to encode the file.
- Review the output — the textarea shows the full
data:image/…;base64,…string. - Copy to clipboard — use the copy button to paste into your project or API client.
What is a data URI?
A data URI embeds file content directly in a URL string. For images it looks like:
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA…The prefix declares the MIME type (image/png, image/jpeg, etc.). Everything after the comma is Base64-encoded binary data. Browsers decode it on the fly for <img src="…"> or background-image: url(…).
When Base64 helps — and when it does not
| Good fit | Poor fit |
|---|---|
| Tiny icons and sprites under ~2–4 KB | Large hero photos or gallery images |
| Single-file HTML prototypes or demos | Assets that should be cached separately by CDN |
| Email templates with embedded images | Pages where Lighthouse performance scores matter |
| API JSON fields that require inline binary | Images that change often (invalidates whole document cache) |
Base64 strings are roughly 33% larger than the raw binary file. For big images, a normal URL plus HTTP caching is almost always faster for end users.
Using the encoded string
In HTML: paste the full data URI into an img element’s src attribute.
In CSS: use background-image: url("data:image/…") for small decorative graphics.
In JavaScript / APIs: send the string as a field value; some endpoints want only the Base64 payload without the data: prefix — strip the header if your API docs require raw Base64.
Privacy note
Encoding runs entirely in your browser. Sensitive diagrams, screenshots, or unreleased creative assets never pass through ShoutingNow servers. Clear the page or close the tab when finished if you are on a shared computer — the textarea holds the full encoded content in memory.