Resumable.js
Claim this toolRobust, resumable, and fault-tolerant file uploads for web browsers.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Highly reliable for large file uploads
Biggest con
Requires server-side implementation to reassemble chunks
TL;DR - Resumable.js
- 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.
Pricing: Free plan available
Best for: Growing teams
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
Pros & Cons
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
Preview
Key Features
Splits files into small chunksUploads chunks independentlyRetries failed chunks automaticallyAllows pausing and resuming uploadsRecovers from network interruptions or browser crashesProvides progress eventsSupports multiple concurrent uploadsNo external dependencies (except for HTML5 File API)
Pricing Plans
Free TrialPricing checked Jul 8, 2026
Free
Free
- 1 user
- 1 project
- 1 GB storage
- Basic features
Basic
$10 / month
- 5 users
- 5 projects
- 10 GB storage
- Advanced features
Pro
$25 / month
- Unlimited users
- Unlimited projects
- 100 GB storage
- All features
- Priority support
Reviews
$99Free with your review
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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