React does not compress images itself. In a React upload flow, take the selected browser File, compress it asynchronously in the browser, then upload the returned File through your existing upload path. A library such as browser-image-compression is a straightforward way to do this.
Compress the selected file before uploading it
Install the package with npm install browser-image-compression, then call it from the file input’s change handler. The example below keeps the selected file in state and passes the compressed result to a placeholder upload function; connect that function to your application’s existing API or storage provider.
import { useState } from 'react';
import imageCompression from 'browser-image-compression';
export default function ImageUpload() {
const [file, setFile] = useState(null);
const [status, setStatus] = useState('');
async function handleFileChange(event) {
const selected = event.target.files?.[0];
if (!selected) return;
setStatus('Compressing…');
try {
const compressed = await imageCompression(selected, {
maxSizeMB: 1,
maxWidthOrHeight: 1920,
useWebWorker: true,
});
setFile(compressed);
setStatus(`Ready to upload (${compressed.size} bytes)`);
} catch (error) {
setStatus(error.name === 'AbortError' ? 'Compression cancelled.' : 'Could not compress this image.');
console.error(error);
}
}
async function handleUpload() {
if (!file) return;
setStatus('Uploading…');
try {
await uploadFile(file);
setStatus('Upload complete.');
} catch (error) {
setStatus('Upload failed.');
console.error(error);
}
}
return (
{status}
);
}
async function uploadFile(file) {
const formData = new FormData();
formData.append('image', file, file.name);
const response = await fetch('/api/upload', { method: 'POST', body: formData });
if (!response.ok) throw new Error(`Upload failed: ${response.status}`);
}The sample’s 1 MB target and 1,920-pixel maximum dimension are illustrative settings, not universal recommendations or measured savings. Set limits based on your product’s upload rules and the image quality it needs. The package documentation describes its Promise-based React-compatible API and options at browser-image-compression on npm.
Choose the compression settings for your upload requirements
Byte size and pixel dimensions solve different problems. A maximum dimension limits how large the image can be in pixels; a size target controls the encoded output size. Use one or both constraints only when your product needs them. Lower dimensions or more aggressive lossy encoding can reduce detail, so inspect results using representative photographs and graphics.
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maxSizeMB: target a maximum output size in megabytes.maxWidthOrHeight: limit the longer image dimension while preserving its proportions.initialQuality: configure the initial lossy encoding quality where supported by the chosen output format.fileType: request an output format such as JPEG or WebP when appropriate and supported by the target browser.useWebWorkerandonProgress: opt into worker processing and report progress when the UI needs it.preserveExif: decide whether EXIF metadata should be retained; orientation handling is a separate concern.signal: pass an abort signal if the interface lets users cancel an in-progress compression.
Check the package documentation for the complete current option list and details: browser-image-compression options.
Handle the result safely in your upload flow
- Validate that a file was selected, and catch compression failures or cancellation rather than leaving the form stuck in a loading state.
- Compare
compressed.sizewith the originalFile.size. A result is not guaranteed to be smaller in every case; decide whether to keep the original when compression increases the size. - Preserve a useful filename and send the actual output type with the upload. If you change formats, ensure your server does not rely on the original filename extension or MIME type.
- Do not upload until the asynchronous compression promise resolves. Pass the returned
Fileto the upload code, not the original input file. - Test camera images for orientation. Decide explicitly whether to preserve metadata; retaining EXIF is not the same as correcting orientation.
Browser APIs for a custom compression pipeline
You can build the pipeline without a compression package, but then your application owns more compatibility and error handling. A typical flow fetches or reads a Blob, decodes it with createImageBitmap, draws it to a canvas, and encodes the canvas with toBlob. Chrome’s overview describes this pattern and using createImageBitmap in workers: Chrome for Developers: createImageBitmap in Chrome 50. MDN documents worker decoding options, orientation and resizing behavior: MDN: WorkerGlobalScope.createImageBitmap.
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A custom implementation must choose output type and quality, handle a null canvas encoding result, manage filenames and MIME types, and account for orientation, metadata, cancellation and browser differences. For browser image resizing specifically, pica documents approaches including workers, WebAssembly, createImageBitmap and JavaScript fallbacks. The cited documentation does not establish a comparable speed or quality benchmark for these approaches or libraries; test them with your own files and target devices.
Performance, compatibility and deployment checks
- Image decoding and canvas re-encoding can take time and use memory, especially for large source images. Worker processing can keep work off the main thread when supported; the package documents fallback to the main thread and notes that its non-blocking worker path depends on browser support for
OffscreenCanvas. - Review your Content Security Policy if using the worker path. The package documents that it may require
blob:and a library URL inscript-src, or a self-hosted worker-library URL. - Browser canvas dimensions have limits. The package says it adjusts dimensions to remain within browser limits, but test very large images in the browsers and devices you support.
- Do not force WebP or another output format until you have verified it works for the browsers and downstream systems in your support matrix. The package documents JPEG, PNG, WebP and BMP support and notes browser-specific canvas and WebP considerations.
- There is no documented universal compression ratio or processing-time figure for this workflow. Measure representative input types and devices before claiming savings or setting performance expectations.
Project documentation and implementation notes are available in the browser-image-compression repository.
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Or skip the browser setup
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