For developers
TransferNow API – to automate file uploads, sharing, and downloads
With just a few lines of code, TransferNow allows developers to integrate a large file transfer solution into websites, mobile apps, SaaS solutions, or any other custom workflow.
- Multipart upload up to 5 TB per fileResilient multipart upload up to 5 TB per fileProgrammatically upload up to 5 TB per file with our API and SDK.
- Email notificationsEnable email notificationsSet up and customize email notifications.
- Multiple subdomainsCreate one or more subdomainsCreate one or more subdomains. Choose to enable file reception and customize the form to collect files according to your use cases. Programmatically download the received files.
- Customization and brandingYour transfers, your styleAssociate your subdomains with a specific theme: customize the interface (logo, background, and colors) as well as the download page.
- Secure file transfer (SSE-C/AES 256 bits)Encryption of stored filesIn addition to securing access to your transfers with a password, you can choose to encrypt files stored on disk with your own passphrase (SSE-C).
4.9 / 5 on Trustpilot and Google (20k+ reviews)
TransferNow API
Discover TransferNow API for developers and businesses
API File Upload
A powerful REST API for uploading files for businesses
Every day, we work to provide you with the best possible tool to transfer files securely. You don’t have to develop new systems or implement new features that can take months of work to upload files. TransferNow takes care of everything for you with our magical API!
In minutes, start sending files from your solution with our easy-to-integrate SDK. Our file transfer API solves and covers all the needs and use cases of companies of all sizes.
curl -X POST "https://api.transfernow.net/v1/transfers" \ -H "Content-Type: application/json" \ -H "x-api-key: <YOUR_API_KEY>" \ -d '{ "toEmails": ["my.contact@provider.com"], "files": [ {"name": "file1.txt", "size": 14587}, {"name": "music.mp3", "size": 5496409} ], "subject": "Text and Music" }' HTTP/1.1 200 OK{ "transferId": "20260802UlTXDuSp", "link": "https://www.transfernow.net/dl/20260802UlTXDuSp/…", "files": [{"id": "lZEpvC1T", "multipartUpload": {…}}, …]}import {upload} from '@transfernow/api-sdk'; upload({ apiKey: 'PUT your API Key here', toEmails: ['my.contact@provider.com', 'my.other.contact@provider.com'], filePaths: ['/tmp/file_to_upload.txt', '/tmp/file2.txt'], message: 'A brillant folder content', subject: 'Folder 123',}).then(r => console.log(`transfer ${r.transferId} was sent successfully`)) .catch(e => console.error(e));REST API & SDK
A REST API — and an SDK to move even faster
Create a transfer with a single HTTP request: JSON REST API, API key authentication, and an immediate response with the download link.
In just a few minutes, integrate our official SDK to upload and transfer files programmatically, and cover every use case, even the most complex ones!
Fair pricing
Simple pay-per-use pricing
Try our solution for free for 14 days and get 100 GB of API storage included to integrate our API and perform your tests.
Once your tests and integration are complete, choose to enable billing; the average number of gigabytes (GB) used will be charged at the beginning of the month for the past period (0.20 €/GB/month).
With Pay-As-You-Go billing, you get optimized storage capacity and, more importantly, you save gigabytes!
Developers
We’re developers too
Our team is also made up of developers, so we know how many constraints there are to upload and distribute numerous file transfers efficiently.
A JSON REST API, key-based authentication (x-api-key header), resilient multipart upload — and an official Node.js SDK if you’d rather not write the HTTP yourself.
- POST/v1/transfers
- GET/v1/transfers/{transferId}
- PUT/v1/transfers/{transferId}/upload-done
- DELETE/v1/transfers/{transferId}
- POST/v1/search
Pro solution
Join thousands of companies
Thousands of businesses of all sizes, from startups to large companies, use TransferNow’s software and APIs to securely upload and send large files every day.
From automated delivery of assets to receiving files through your own forms, the API covers the full cycle: resilient multipart upload up to 5 TB per file, transfers available for up to 365 days, storage region selection, download tracking, and full customization to match your brand.
Secure file transfers
Your files are safe
By using our service to upload and transfer files, you have a dedicated and secure global cloud infrastructure where files are stored and encrypted on disk (AES-XTS 256 bits) in datacenters (AICPA SOC 2 Type II) on the European, American, and Asian continents.
Use the SSE-C (Server-Side Encryption with Customer-Provided keys) feature to protect access to your file downloads and encrypt them on disk with your own key/passphrase.
They trust us
Our customers endorse TransferNow
Our solution is approved by professionals, small and medium-sized businesses, startups, and large companies worldwide.
Our API features for transferring files
Upload
- No transfer limit
- Resilient multipart upload up to 5 TB per file
- Upload locally or via a URL
- Storage region selection
- Transfers available for up to 365 days
- Customizable transfer links
- Customization on request
Download
- Download from a URL
- Customization of the download page
- File preview (images, video, audio, docs)
- Download tracking
Security
- Signed URLs
- Anti-virus scan during upload
- Password-protected transfers
- Files stored on disk encrypted with your passphrase
- Encryption in transit (SSL/TLS) and at rest (AES-XTS 256 bits)
Customization and branding
- Multiple subdomains
- Form generator for receiving files
- Notification settings
- Customization of the download page
- Email customization
- Color customization
TransferNow in numbers
Millions of files transferred securely
Data collected since September 2022 — and we’re still counting 🚀
Do you have a question?
How do I get an API key and start uploading files?
To get an API key and start sending or downloading files, you need to create a TransferNow API account.
Is it possible to try the API for free?
Yes! You can create a free account for 14 days without the need to add a payment method. You get 100 GB of storage space to carry out your PoC and validate our solution. You can also choose to enable billing for your account before the end of your free trial.
How is the use of the TransferNow API billed?
The amount charged corresponds to the average number of gigabytes (GB) used over the past month. A payment is triggered on the 2nd of the current month corresponding to the consumption of the previous month (0.20 €/GB/month).
Can I cancel my TransferNow API account?
Yes, if you are no longer using the TransferNow API to upload files, you can choose to disable billing for your account. If there is an outstanding invoice for GB usage from last month, you will need to settle the outstanding invoice to disable billing.
TransferNow API Service - Secure and fast transfer of large files up to 5 TB per transfer
Integrate and try TransferNow API free for 14 days
100 GB of storage to validate your PoC – No payment method required.