jQuery File Upload Retrospective: The 30k-Star Upload Plugin That Refuses to Die

File uploads sound simple, but building a complete implementation requires far more consideration than you’d expect. Large files? Network interruptions? Progress indication? Multiple selection? Drag and drop? Preview support?

In 2010, Sebastian Tschan released jQuery File Upload. 30.7k stars, PHP backend, jQuery frontend. Fifteen years later, this plugin is still used in countless projects. Having used it many times as a frontend dev, here’s why this “old-timer” hasn’t been phased out.

What problem does it solve

Back in 2010, the browser’s native file upload experience was terrible. <input type="file"> only supported single selection, had no progress feedback, choked on large files, and required restarting from scratch if the upload failed.

jQuery File Upload solved all of these at once:

• Multi-file selection (native HTML5 multiple attribute)
• Drag & drop uploads (HTML5 drag & drop API)
• Real-time progress bars (XMLHttpRequest progress events)
• File preview (FileReader API for local file reading)
• Chunked uploads (large files sliced, supporting resumable transfer)
• Cross-domain uploads (CORS + iframe fallback)
• File validation (type, size, format checks)

In that era, each of these features was revolutionary.

Core features

Multi-file upload Select multiple files at once, each uploading independently with its own progress display. Supports parallel and queued upload modes. Parallel uploads multiple files simultaneously for speed; queued uploads sequentially for lower server pressure.

Drag & drop Drag files from the desktop directly into a designated browser area. This interaction seems obvious now but was cutting-edge in 2010. The plugin handles edge cases like dragging non-file content with graceful fallback.

Progress feedback Each file has its own progress bar showing upload percentage, transferred size, transfer speed, and estimated time remaining. This experience is essential for large file uploads — users need to know “how much longer?”

Chunked uploads Large files (like multi-GB videos) are automatically sliced into smaller segments. If the network drops, only the failed segment needs retransmission, not the entire file. Critical for mobile and unstable network environments.

File preview Preview images, audio, and video before uploading. Images support zoom and rotate preview; audio and video support playback preview. Users can verify everything looks right before the actual upload, reducing wasted transfers.

Cross-domain support Modern browsers use CORS for cross-domain uploads; older browsers (mainly IE) use hidden iframe fallback. Both approaches are transparent to the user.

Server-side examples The project doesn’t just provide frontend code — it includes example implementations in multiple backend languages: PHP, Python, Node.js, Go, Java. Each includes complete logic for file receiving, validation, and storage. Saves massive amounts of time for frontend developers with less backend experience.

Real-world usage

Scenario 1: CMS content management News site backend where editors upload featured images. Drag image to editor, auto-upload, return URL inserted into the article. The preview feature lets editors confirm the image looks right before saving.

Scenario 2: Cloud storage apps Users upload large files to cloud storage. Chunked uploads guarantee reliability, auto-resume on disconnect, and progress bars keep users informed. Combined with backend multi-threaded receiving for maximum bandwidth utilization.

Scenario 3: Photo social networks Users batch-upload photos. Multi-select + preview + progress bar makes batch uploads feel smooth and natural. Supports HEIC to JPEG conversion, image compression, and other preprocessing.

Scenario 4: Enterprise document systems Employees upload documents in various formats. File type whitelist, size limits, and virus scanning can all be configured in the plugin’s validation stage.

Quick start

<!-- Basic usage -->
<input id="fileupload" type="file" name="files[]" multiple>

<script src="jquery.min.js"></script>
<script src="jquery.ui.widget.js"></script>
<script src="jquery.iframe-transport.js"></script>
<script src="jquery.fileupload.js"></script>

<script>
$('#fileupload').fileupload({
    url: 'server/php/',
    dataType: 'json',
    done: function (e, data) {
        $.each(data.result.files, function (index, file) {
            $('<p/>').text(file.name).appendTo(document.body);
        });
    },
    progressall: function (e, data) {
        var progress = parseInt(data.loaded / data.total * 100, 10);
        $('#progress .bar').css('width', progress + '%');
    }
});
</script>

Backend: The project includes a complete PHP example in the server/php/ directory. Copy to your server, configure upload directory permissions, and you’re good to go.

The good and the bad

What I loved:

• Comprehensive feature set — covers virtually every file upload scenario
• Excellent backward compatibility, works with IE7+ (though IE is retired now)
• Server-side examples cover mainstream backend languages, low integration cost
• Detailed documentation with explanations for every configuration option
• MIT license, completely free for commercial use
• Massive community — thousands of Q&As on StackOverflow

What frustrated me:

• jQuery dependency feels out of place in 2025’s frontend tech stack
• UI style is dated, requires significant customization for modern designs
• Code size is large by modern standards, with features you may not need
• New projects are more likely to choose native Fetch API + modern framework solutions
• Maintenance frequency has noticeably decreased — mostly bug fixes rather than new features

Is it still worth using in 2025?

Honestly, I wouldn’t recommend jQuery File Upload for new projects. Today’s frontend ecosystem has better alternatives:

• Uppy: Modern, modular, supports multiple upload backends, beautiful UI
• Dropzone.js: Lightweight, dependency-free, simple configuration
• Native implementation: Fetch API + FormData, custom wrapper with modern frameworks (React/Vue)

But jQuery File Upload still has its value:

1. Legacy maintenance: Countless existing projects still use it, and maintenance requires reference materials
2. Learning reference: Its implementation approach (chunking, resume, cross-domain fallback) is still standard practice
3. Quick prototyping: Need to spin up an upload demo fast? Its server-side examples save tons of time
4. jQuery projects: If your project already depends on jQuery, integration cost is essentially zero

Bottom line

jQuery File Upload is the “classic textbook” of frontend file uploads. 30.7k stars and fifteen years of staying power prove it solved a genuine problem.

It represents the best practices of its era: using jQuery to wrap complex file upload interactions when browser capabilities were limited and frontend frameworks weren’t mature, letting developers focus on business logic rather than compatibility issues.

Today’s frontend ecosystem is completely different, but its core design principles — chunked uploads, progress feedback, drag interaction, cross-domain handling — are still the standard approach for file uploads. Understanding this plugin’s implementation helps understand modern upload library design too.

For developers still maintaining jQuery legacy projects, or frontend newcomers wanting to learn file upload fundamentals, jQuery File Upload remains a valuable reference.

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About the Author

Liudingyu is a full-stack developer and heavy GitHub user. With 900+ starred repos over the past 3 years, this site only covers tools I’ve actually used or deeply researched.

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