Uplint vs Filestack: Which One Do You Actually Need?

The question comes up regularly: "Should we use Filestack or Uplint?"

The confusion is understandable. Both services involve file handling and uploads. But they solve fundamentally different problems.

Filestack is a file storage and delivery platform. Uplint is a file validation and trust layer. The difference matters.

What Filestack Does

Filestack provides:

• File picking and uploading — Browser widget that lets users select files from device, cloud storage, or URLs
• Cloud storage — Stores files in your S3 bucket or theirs
• Content delivery — Optimized CDN for serving files
• Transformations — Image resizing, format conversion, video transcoding
• API — Programmatic file handling

Filestack is the answer to: "How do I let users upload files and then deliver them quickly?"

What Uplint Does

Uplint provides:

• File validation — Is this file what it claims to be?
• Blank detection — Does this file actually contain content?
• Threat scanning — Is this file malicious?
• Context-based rules — Does this file belong in this context?
• Audit logging — Full compliance trail of every upload decision
• Content analysis — What's actually inside this file?

Uplint is the answer to: "Can I trust this file?"

The Scenarios

Here's how to think about which you need:

Scenario 1: You're building a photo sharing app

Users upload photos, you need to serve them back with different dimensions for mobile and desktop.

• Use Filestack for the upload widget and image transformations
• Use Uplint to verify the photos are actually images (not disguised executables) and detect blank/corrupt files

Scenario 2: You're building a healthcare app

Patients submit medical documents. You need to validate that they're actually documents (not arbitrary files), maintain compliance audit trails, and avoid blank submissions.

• Use Uplint to validate documents and maintain audit logs
• Skip Filestack (or use simple S3 storage) — you don't need transformation features

Scenario 3: You're building a document collaboration tool

Users upload PDFs and Word documents. You need to serve them back reliably and let users search inside them.

• Use Filestack for storage and potentially OCR features
• Use Uplint to validate that uploaded files are actually PDFs/documents and contain readable content

Scenario 4: You're building a fintech app

Users upload receipts and bank statements. You need validation, threat scanning, and strict compliance logging.

• Use Uplint for validation and compliance
• Skip Filestack — you don't need the transformation features
• Use S3 directly for storage

Direct Comparison

Real-World Example: A Loan Application Platform

A fintech company builds a platform where users upload bank statements and pay stubs to qualify for loans.

Requirements:

• Users should be able to upload files from their device
• Files should be validated as actual PDFs (not disguised executables)
• Files should be scanned for threats
• Files should be checked for blank pages (users often accidentally upload empty files)
• Complete audit trail of every upload decision (compliance requirement)
• Files stored in the company's own S3 bucket

Implementation with Filestack + Uplint:

// Step 1: User picks file with Filestack widget
const client = filestack.init('YOUR_API_KEY');

client.pick({
  accept: 'application/pdf'
}).results(function(result) {
  const uploadedFile = result[0];

  // Step 2: Validate the file with Uplint
  validateFileWithUplint(uploadedFile);
});

async function validateFileWithUplint(file) {
  const result = await uplint.validate(file, {
    context: 'loan-application',
    scan: true,
    detectBlanks: true
  });

  if (!result.trusted) {
    console.error('File rejected:', result.reason);
    // Show user error
    return;
  }

  // Step 3: File is validated, proceed with loan application
  submitLoanApplication(file);
}

Why both?

• Filestack's widget handles the user experience of picking files
• Uplint validates that the file is actually a PDF, not malicious, and contains content
• Compliance team can audit every upload decision

Could you use only Filestack? Filestack does some basic validation (extension checking, size limits), but doesn't:

• Scan for threats
• Detect blank PDFs
• Provide compliance audit trails
• Understand content context

Could you use only Uplint? Yes, if you're willing to:

• Build your own file picker UI (or use a simple HTML input)
• Handle S3 upload yourself
• Skip Filestack's transformation features

When Filestack Makes Sense

Use Filestack if:

• You need image transformations (resizing, format conversion)
• You want a managed CDN for file delivery
• Your users need to pick files from multiple sources (device, Google Drive, Dropbox, etc.)
• You want out-of-the-box upload UI
• Media/content delivery is core to your product

When Uplint Makes Sense

Use Uplint if:

• You need to validate file content (not just extensions)
• You deal with regulated data (healthcare, finance, legal)
• You need compliance audit trails
• Blank files would cause problems for your users
• Malware scanning is a requirement
• You need context-based validation rules

When You Need Both

Use both if:

• Users need a good file-picking experience (Filestack)
• You need to validate what they picked (Uplint)
• This is typical for any production system handling external files

When You Need Neither

You might not need either if:

• Your files come from trusted internal systems only
• You're not concerned about blank files or malware
• You're not regulated
• You're using a platform that already has built-in file handling (like Vercel, Netlify)

Pricing Considerations

Filestack: Usage-based pricing. Pay for storage, bandwidth, transformations. Costs scale with volume.

Uplint: Per-validation pricing. One API call = one validation. Predictable costs that scale with number of uploads, not with storage or delivery.

For a healthcare app with 10,000 monthly uploads:

• Filestack: Potentially $200-500/month depending on storage and delivery
• Uplint: Around $50-100/month for validation

(Actual pricing varies; these are estimates. Check current pricing pages.)

Implementation Path

If starting from scratch:

1. Build basic upload with HTML <input type="file">
2. Use Uplint for validation
3. Use S3 for storage
4. If you need better UX or transformations later, add Filestack

If using Filestack already:

1. Keep Filestack for upload widget and transformations
2. Add Uplint layer after upload to validate content
3. This provides both good UX and security

Key Takeaway

Filestack = Upload + Delivery Uplint = Validation + Trust

They're not competitors. They're complementary. Most production systems that need to be secure use both, with Filestack handling the upload experience and Uplint handling the validation and compliance.

If you're building something that matters — handling regulated data, serving external users, or dealing with compliance requirements — Uplint's validation layer is nearly non-negotiable, regardless of whether you use Filestack.

Uplint provides comprehensive file validation and threat detection. Whether you're using Filestack, building custom uploads, or using another service, Uplint sits behind the scenes ensuring every file is trusted. Start validating free →