Filestack API

Name: Filestack API API
Brand: Filestack API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentMediaImage ProcessingapiKey9 EndpointsREST

For Agents

Upload, transform, and deliver files via Filestack's nine endpoints across upload, processing, and CDN hosts using a query-string API key.

Connect the Filestack API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Filestack API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Install Jentic One Beta (Self-Hosted)

Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Filestack API API.

Upload files via single-shot POST /store/{storeLocation} or chunked multipart endpoints

Run on-the-fly image transformations via the processing host with chained transform tokens

Fetch file binaries and metadata by handle for downstream rendering or analysis

Generate signed URLs using Filestack security policies and HMAC-SHA256 signatures

GET STARTED

Start building with Filestack API API

Explore with Jentic

View OpenAPI Document

Jentic publishes the only available OpenAPI document for Filestack API, keeping it validated and agent-ready.

Jentic publishes the only available OpenAPI specification for Filestack API, keeping it validated and agent-ready. The Filestack API is a file-handling platform spanning upload (multipart and URL-based), metadata, transformations, and CDN delivery across five hostnames - the File API, Upload API, CDN, Processing API, and Cloud API. Authentication is by query-string API key, with optional security policy and signature parameters for signed URLs. Filestack is used by product teams that need to embed reliable upload widgets and on-the-fly image processing without operating their own ingestion pipeline.

Use Cases

Patterns agents use Filestack API API for, with concrete tasks.

★ User-Generated Upload Widget Backend

Product teams that ship a file picker can hand uploads to Filestack via POST /store/{storeLocation} or the /multipart/* endpoints, returning a stable handle for the application to reference. Filestack absorbs the bandwidth spikes, virus-scans content, and exposes the file via its CDN, so the application does not need to run its own ingest tier.

On a large file upload, call POST /multipart/start, iterate POST /multipart/upload with each chunk, then commit and return the resulting handle to the calling application.

On-The-Fly Image Optimisation

Marketing and e-commerce teams can have an agent call the processing host with a chained transform string (resize, crop, compress) so the same source image renders perfectly across hero, thumbnail, and email contexts. Filestack handles the rendering and CDN caching, removing the need to pre-generate every variant.

Construct a transform URL using GET /{apikey}/{transforms}/{handle} with resize=width:600,height:400 and return the optimised CDN URL.

Signed URL Distribution

Teams handling sensitive documents can generate Filestack security policies (base64 JSON) and HMAC-SHA256 signatures, then share signed URLs that expire and restrict allowed operations. The agent assembles the policy plus signature query parameters and returns a tamper-evident URL the recipient can use without the underlying API key.

Build a JSON policy with expiry and allowed calls, base64 it, sign it with HMAC-SHA256, and return the policy and signature appended as query parameters to the file URL.

AI Agent Filestack Integration via Jentic

An agent connected to Jentic can search by intent (for example transform an image to a thumbnail), receive the right Filestack operation across upload, processing, or CDN hosts, and execute without the API key entering its context. Integration drops from a multi-day Filestack SDK adoption to a single search-load-execute cycle.

Search Jentic for upload a file to filestack, load POST /store/{storeLocation}, and execute with the file payload while Jentic injects the API key.

Key Endpoints

9 endpoints — jentic publishes the only available openapi specification for filestack api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/file/{handle}

Retrieve a stored file by handle

DELETE

/file/{handle}

Delete a stored file

GET

/file/{handle}/metadata

Read file metadata

POST

/store/{storeLocation}

Single-shot upload to a configured store

POST

/process

Run a processing task on a file

POST

/multipart/start

Start a multipart upload session

POST

/multipart/upload

Upload a chunk in an active multipart session

GET

/file/{handle}

Retrieve a stored file by handle

DELETE

/file/{handle}

Delete a stored file

GET

/file/{handle}/metadata

Read file metadata

POST

/store/{storeLocation}

Single-shot upload to a configured store

POST

/process

Run a processing task on a file

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Filestack API keys, security policies, and signing secrets are stored encrypted in the Jentic vault. Agents receive scoped references; raw keys and HMAC secrets never enter the agent's context.

Intent-based discovery

Agents search Jentic by intent (for example transform an image) and Jentic returns the right Filestack operation across the upload, processing, or CDN hosts with its input schema.

Time to first call

Direct Filestack integration: 2-4 days for SDK setup, multipart handling, and signed URL generation. Through Jentic: under one hour - search, load, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Cloudinary Upload API

Image and video media platform with deeper transformation graph

Choose Cloudinary when the workflow needs video transcoding pipelines and AI-driven image analysis beyond Filestack's transform set.

Alternative

Filerobot DAM API

DAM-first product where assets live in a managed library

Choose Filerobot when assets need to live in a long-term managed library with metadata, rather than ephemeral handles.

Complementary

Dropbox API

Source files from Dropbox and ingest into Filestack for transformation

Use Dropbox alongside Filestack when source files live in user Dropbox folders and need to be ingested for processing and CDN delivery.

FAQs

Specific to using Filestack API API through Jentic.

Why is there no official OpenAPI spec for Filestack API?

Filestack does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Filestack API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Filestack API use?

Filestack authenticates with an API key sent as the key query parameter. For signed access, add a base64-encoded security policy and an HMAC-SHA256 signature as policy and signature query parameters. Through Jentic, the API key is stored in the vault and the agent never handles it directly.

Can I upload a large video with the Filestack API?

Yes. Use the multipart flow: POST /multipart/start to open a session, POST /multipart/upload for each chunk, then commit. This lets you resume on failure and avoids hitting the single-shot upload size limit.

What are the rate limits for the Filestack API?

Filestack throttles per API key based on your plan tier rather than publishing a fixed RPS. The processing host applies separate quotas to transformations versus delivery. Agents should treat 429 responses as a signal to back off and retry.

How do I transform an image with Filestack via Jentic?

Search Jentic for transform a filestack image, load the GET /{apikey}/{transforms}/{handle} operation, and execute with a transform string such as resize=width:600. Jentic injects the API key from the vault.

Can I delete a file from Filestack programmatically?

Yes. Call DELETE /file/{handle} with the file handle, signed if your account requires it. The CDN cache is invalidated by Filestack as part of the deletion.