Resumable.js
Claim this toolRobust, resumable, and fault-tolerant file uploads for web browsers.
Free plan available Visit Website Freemium Visit Website
Tracked since 2026
The Bottom Line
- Price
- Free plan available. Compare plans
Key facts
- Enables resumable and fault-tolerant file uploads in browsers.
- Splits large files into chunks for reliable transfer and recovery.
- Simplifies implementation of robust upload functionality for developers.
Pros
- Highly reliable for large file uploads
- Improves user experience by allowing resume functionality
- Reduces server load by only re-uploading failed chunks
- Easy to integrate into existing web applications
- No external dependencies
Cons
- Requires server-side implementation to reassemble chunks
- May add slight overhead due to chunking process
- Limited to modern browsers supporting HTML5 File API
What is Resumable.js?
Resumable.js is a JavaScript library that provides a stable and resumable upload process for web applications. It achieves this by splitting large files into smaller chunks, uploading them independently, and then reassembling them on the server. This chunking mechanism allows uploads to be paused, resumed, and recovered from network interruptions or browser crashes without losing progress.
This library is ideal for developers who need to implement reliable file upload functionality, especially for large files, in their web applications. It simplifies the complexity of handling partial uploads, retries, and progress tracking, providing a smoother user experience and reducing frustration caused by failed uploads. By abstracting away the low-level details of chunking and retries, Resumable.js enables developers to focus on integrating robust file uploads into their projects with minimal effort.
Available on: Web
Preview
Key Features
- Splits files into small chunks
- Uploads chunks independently
- Retries failed chunks automatically
- Allows pausing and resuming uploads
- Recovers from network interruptions or browser crashes
- Provides progress events
- Supports multiple concurrent uploads
- No external dependencies (except for HTML5 File API)
Pricing
Freemium
Resumable.js offers a generous free tier with optional paid upgrades for advanced features.
Resumable.js by the numbers
| Metric | Resumable.js | Peer median | Position (1 is best) |
|---|---|---|---|
| Free plan | Yes | 79% have one | n/a |
| Listed as an alternative to | 3 tools | 2 | #135 of 441 (joint) |
Each position is counted among the tools that have data for that row, as noted under it. All UI/UX Design data · How we compute this. Advertising and placement fees are not inputs to any position.
Cite this: Toolradar, “Resumable.js by the numbers”, Oct 2026.
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Resumable.js FAQ
How does Resumable.js ensure file upload reliability?
Resumable.js ensures reliability by splitting large files into smaller chunks. These chunks are uploaded independently, allowing the system to pause, resume, and recover from network interruptions or browser crashes without losing overall upload progress. This mechanism prevents complete upload failures due to transient issues.
Which teams would benefit most from using Resumable.js?
Teams developing web applications that require robust file upload functionality, especially for large files, would benefit most. It simplifies the complexities of handling partial uploads, retries, and progress tracking, which is crucial for a smooth user experience. Developers can integrate reliable uploads with minimal effort.
How is Resumable.js priced?
Resumable.js is available on a free tier. For users requiring more extensive usage or additional features, paid plans are offered. This allows developers to start with the basic functionality and scale up as their needs evolve.
Can Resumable.js handle uploads when a user's internet connection is unstable?
Yes, Resumable.js is designed to handle unstable internet connections effectively. By chunking files and uploading them independently, it can resume uploads from the point of interruption, even after network outages or browser crashes. This prevents users from having to restart large uploads from the beginning.
What kind of server-side requirements does Resumable.js have?
Resumable.js requires a server-side implementation to reassemble the file chunks it uploads. While the client-side library handles the chunking and upload process, the server is responsible for piecing these chunks back together into the original file. This is a necessary component for its functionality.
How does Resumable.js compare to Transloadit for file uploads?
Resumable.js focuses specifically on providing robust, resumable, and fault-tolerant file uploads through a JavaScript library. It handles the client-side chunking and retry logic. Transloadit, while also handling file uploads, typically offers a broader suite of file processing services beyond just the upload mechanism.
Does Resumable.js support older web browsers?
Resumable.js is limited to modern browsers that support the HTML5 File API. Its core functionality, which relies on client-side file manipulation and chunking, requires these contemporary browser capabilities. Therefore, it may not function as intended in very old browser versions.
Source: resumablejs.com