heic-jpg-converter
v1.0.9
Published
A pure vanilla JavaScript utility to convert HEIC/HEIF images into JPEG or PNG — works in the browser, Node.js, and Bun
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rajeshkrReadme
heic-jpg-converter
A pure vanilla JavaScript utility to convert HEIC/HEIF images into JPEG or PNG.
Works in the browser (via CDN or npm), Node.js (≥ 18), and Bun (≥ 1.0) — no native binaries required.
Demo
Installation
# npm
npm install heic-jpg-converter
# Bun
bun add heic-jpg-converter
# yarn
yarn add heic-jpg-converterBrowser
Option A — CDN (no build step)
Drop one of these into your HTML to load the UMD bundle directly:
<!-- jsDelivr -->
<script src="https://cdn.jsdelivr.net/npm/heic-jpg-converter/dist/index.umd.js"></script>
<!-- unpkg -->
<script src="https://unpkg.com/heic-jpg-converter/dist/index.umd.js"></script>Both exports (decoder and isHeic) are available on the global HeicToJpeg object after the script loads:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>HEIC to JPEG</title>
</head>
<body>
<input id="fileInput" type="file" accept=".heic,.heif,image/heic,image/heif" />
<img id="preview" style="display:none;max-width:100%" />
<a id="download" style="display:none">Download JPEG</a>
<script src="https://cdn.jsdelivr.net/npm/heic-jpg-converter/dist/index.umd.js"></script>
<script>
const decoder = HeicToJpeg.default;
const isHeic = HeicToJpeg.isHeic;
document.getElementById("fileInput").addEventListener("change", async (e) => {
const file = e.target.files[0];
if (!file || !(await isHeic(file))) return;
const blob = await decoder({ file, toType: "image/jpeg", quality: 0.9 });
const url = URL.createObjectURL(blob);
const preview = document.getElementById("preview");
preview.src = url;
preview.style.display = "block";
const dl = document.getElementById("download");
dl.href = url;
dl.download = file.name.replace(/\.heic$/i, ".jpg");
dl.textContent = "Download JPEG";
dl.style.display = "inline-block";
});
</script>
</body>
</html>Option B — ES module (npm)
<script type="module">
import decoder, { isHeic } from "https://cdn.jsdelivr.net/npm/heic-jpg-converter/dist/index.js";
const file = /* File from <input> or drag-and-drop */;
if (await isHeic(file)) {
const blob = await decoder({ file, toType: "image/jpeg", quality: 0.9 });
const url = URL.createObjectURL(blob);
document.getElementById("preview").src = url;
}
</script>Note: ES modules require a server (
http://), not a localfile://URL.
Node.js (≥ 18)
import { readFileSync, writeFileSync } from "fs";
import decoder from "heic-jpg-converter";
const buffer = readFileSync("photo.heic");
const blob = new Blob([buffer], { type: "image/heic" });
const jpeg = await decoder({ file: blob, quality: 0.9 });
writeFileSync("photo.jpg", Buffer.from(await jpeg.arrayBuffer()));
console.log("Saved photo.jpg");Bun
import decoder, { isHeic } from "heic-jpg-converter";
const heicFile = Bun.file("photo.heic");
const blob = new Blob([await heicFile.arrayBuffer()], { type: "image/heic" });
if (await isHeic(blob)) {
const jpeg = await decoder({ file: blob, quality: 0.9 });
await Bun.write("photo.jpg", jpeg);
console.log("Saved photo.jpg");
}API
decoder(options) — default export
| Option | Type | Default | Description |
|--------|------|---------|-------------|
| file | File \| Blob | required | HEIC/HEIF source file or blob |
| toType | "image/jpeg" \| "image/png" | "image/jpeg" | Output format |
| quality | number | 0.9 | Quality 0.0–1.0 |
Returns Promise<Blob>
isHeic(file) — named export
Fast multi-stage HEIC/HEIF detection (mime type → extension → magic bytes).
Returns Promise<boolean>
Contact
Please feel free to send an email, issues, suggestions and feedback on [email protected]
License
The MIT License (MIT)
Copyright (c) 2026 Rajesh Kumar
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.