- 99.99% upload success rate
- Fastly global CDN on every delivered file
- 20+ upload sources behind one endpoint
- SOC 2 Type II compliance, with encryption in transit and at rest
- Every device and every network condition, including 2G
What Reliable File Infrastructure Protects
Three things your team is otherwise spending.
Senior Engineer Hours Back on Product Work
Large-file timeouts, mobile network drops, format edge cases. Filestack owns those, so your engineers stay on the roadmap.
Users Who Finish the Action They Came For
Upload friction is silent churn, and it peaks at the moment a user has committed. The transfer stays alive through it.
Months of Build Time, Available on Day One
Resumable uploads, multi-source ingestion, CDN delivery, format handling. Each a multi-month build, all four working on day one.
Built for the Conditions Your Users Actually Experience
The Content Ingestion Network handles reliability at every layer, from the upload handshake to the edge.
Resumable Upload
Parts that already landed are retained, so the transfer continues from where it stopped rather than starting over.
Routed to the Nearest Healthy Node
The closest ingestion point for each upload, with the Picker on top pulling from 20+ cloud sources.
Scale Elastic Processing
Capacity scales to absorb the spike, so a release ships on your schedule rather than your capacity planning.
Global CDN Delivery
Fastly serves from the nearest edge, with responsive variants through auto_image.
Automatic Failover
Traffic reroutes to a healthy node in milliseconds. The client keeps its connection.
Redundant Storage
Geographic redundancy, so files survive a single-region event.
Watch the Network Absorb Real World Conditions
Pick a scenario and see how Filestack keeps the upload alive.
Resumable Upload Over a Dropping 3G Link
The connection drops at 60%. Every chunk already received is retained, the transfer continues from where it stopped, and your application receives one clean file.
How uploading worksAn Ingestion Node Degrades Mid-Traffic
A degrading node leaves rotation in milliseconds and in-flight uploads reroute to the next healthy one, with the client untouched.
Content Ingestion NetworkThe reroute is the only step that changed. Your application receives the same handle either way.
Ten Times Normal Volume, Absorbed
Capacity scales with the incoming volume and returns on its own once the spike passes. Uploads keep completing on the first attempt through the peak.
Plans and volumeIllustrative, not a measured trace. The bars in full orange are the spike hours: no throttling and no queue backlog through the peak.
Performance That Holds Under Pressure
Sized for the peak rather than the average, in every layer the file passes through.
- Resumable uploads on any network. The transfer picks up exactly where it left off.
- Elastic scale for traffic spikes. Ten times normal volume, absorbed at full speed.
- Fastly CDN edge delivery. Served from the node closest to each user, in every market.
- Mobile-first reliability. Uploads complete on the user’s first attempt.
Anycast routing sends each request to the nearest point of presence, so one origin serves every market.
What Teams Gained by Moving to Filestack
Ready Set Recover
A supporter video that misses the operation cannot be sent again. They reached patients on whatever network the supporters were on.
Teachable
More than 125,000 videos to date, absorbed without a dedicated infrastructure team or a custom upload pipeline.
Grailed
In the CTO’s own description, the largest bottleneck in the entire application. Handing it off returned the team to the product.
The Mechanisms, Written Out
For the engineers who have to defend the decision internally.
Handling Large Files in Mobile Upload on Slow Connections
3G, tower handoffs, backgrounded apps. Chunked transfer and resumable mechanics, and what the CIN absorbs. Read the article →
File Delivery 101 for Faster CDN Downloads at Scale
How edge caching works, why origin-served files fall apart under load, and what points of presence buy you. Read the article →
File Upload API Patterns for Production-Ready Apps
Auth flows under load, webhook delivery guarantees, resumable edge cases, and architecting for scale early. Read the article →
Frequently Asked Questions
What happens to an upload when the connection drops?
The upload is chunked, so parts that already reached an ingestion node are retained. When the connection returns, the transfer resumes from the last completed part. The user sees a progress bar that pauses and continues, and your application receives one clean file.
What is the Content Ingestion Network?
The Content Ingestion Network, or CIN, is the routing layer between the uploading device and storage. It sends each upload to the nearest healthy ingestion point and reroutes if one degrades, while the client keeps its connection.
Do I need to do anything to handle a traffic spike?
Nothing. Filestack scales ingestion and processing capacity automatically, so a launch or a viral moment that multiplies your normal upload volume is absorbed without provisioning work, queue tuning, or throttling on your side.
Which CDN delivers the files?
Files are delivered through Fastly, which uses Anycast routing across a global network of points of presence. The same handle serves every region and every size, so there is one origin to maintain.
How long would this take to build in house?
Resumable uploads, multi-source ingestion, geographic redundancy, and CDN delivery are each multi-month builds, and keeping them working across every device and network is permanent maintenance rather than a one-time project.