Transloadit

Add Logic to Your Processing Pipelines

Use JavaScript expressions to compute values, set fallbacks, and branch logic — all inline in your processing steps.

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Documentation
No credit card needed5 GB included in the free plan
Uploaded files
panorama.jpg(3840 × 1080)Landscape
story_reel.png(1080 × 1920)Portrait
cover_art.jpg(2560 × 1440)Landscape
headshot.png(600 × 900)Portrait
hero_banner.jpg(1920 × 720)Landscape
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JavaScript expressions

Use the full power of JavaScript to compute values dynamically based on file properties.

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Fallback values

Provide default values for missing metadata using standard JavaScript operators.

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Conditional logic

Apply different processing based on file size, type, dimensions, or any metadata field.

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Use Cases

Dynamic File Processing

Use JavaScript expressions to create intelligent processing pipelines.

Dynamic dimensions

Calculate output dimensions based on input file properties.

"width": "${file.meta.width * (720 / file.meta.height)}"
bird.webp
1600 × 1200
width960

Fallback values

Provide default values when file metadata is missing.

"title": "${file.meta.title || 'Untitled'}"
photo.jpg
3.8 MB · 4032 × 3024
title"Untitled"

Conditional logic

Apply different processing based on file type, size, or any metadata field.

"resize_strategy": "${file.meta.width > file.meta.height ? 'fit' : 'pad'}"
FileDimensionsResize strategy
panorama.jpg3840 × 1080Evaluating…fitfitportrait.png800 × 1200Evaluating…padpadbanner.jpg1920 × 400Evaluating…fitfitavatar.png512 × 512Evaluating…padpadcover.jpg2560 × 1440Evaluating…fitfitheadshot.png600 × 900Evaluating…padpadhero.jpg1920 × 800Evaluating…fitfitlogo.png256 × 256Evaluating…padpadslide.jpg1280 × 720Evaluating…fitfiticon.png64 × 64Evaluating…padpadsplash.jpg3000 × 1500Evaluating…fitfitthumb.png150 × 200Evaluating…padpadwallpaper.jpg2560 × 1080Evaluating…fitfitprofile.png400 × 400Evaluating…padpadbackdrop.jpg4096 × 2160Evaluating…fitfitstamp.png128 × 128Evaluating…padpadfeature.jpg1600 × 900Evaluating…fitfitbadge.png96 × 96Evaluating…padpadpromo.jpg1200 × 630Evaluating…fitfitphoto.png800 × 1067Evaluating…padpadpanorama.jpg3840 × 1080Evaluating…fitfitportrait.png800 × 1200Evaluating…padpadbanner.jpg1920 × 400Evaluating…fitfitavatar.png512 × 512Evaluating…padpadcover.jpg2560 × 1440Evaluating…fitfitheadshot.png600 × 900Evaluating…padpadhero.jpg1920 × 800Evaluating…fitfitlogo.png256 × 256Evaluating…padpadslide.jpg1280 × 720Evaluating…fitfiticon.png64 × 64Evaluating…padpadsplash.jpg3000 × 1500Evaluating…fitfitthumb.png150 × 200Evaluating…padpadwallpaper.jpg2560 × 1080Evaluating…fitfitprofile.png400 × 400Evaluating…padpadbackdrop.jpg4096 × 2160Evaluating…fitfitstamp.png128 × 128Evaluating…padpadfeature.jpg1600 × 900Evaluating…fitfitbadge.png96 × 96Evaluating…padpadpromo.jpg1200 × 630Evaluating…fitfitphoto.png800 × 1067Evaluating…padpad
Plans and Pricing

Simple Pricing

Bigger plans mean lower cost per GB. Need flexibility? Get a custom plan with spending limits. View all pricing options.

Community
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Perfect for trying out Transloadit

5 GB/mo included
Import & export at 90% discount
Community forum support
All core features included
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Startup
$69/mo
Get Started

For small teams and startups

40 GB/month included
Import & export at 90% discount
90% cheaper than AWS Lambda
Email & chat support
99.9% uptime SLA
Enterprise
Custom
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For teams with advanced needs

Custom GB allowances
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Volume discounts available
Processing steps with JavaScript expressions
{
  "steps": {
    ":original": {
      "robot": "/upload/handle"
    },
    "resized": {
      "use": ":original",
      "robot": "/image/resize",
      "width": "${Math.min(width, 1920)}",
      "height": "${Math.min(height, 1080)}",
      "imagemagick_stack": "${size > 5000000 ? 'v3.0.1' : 'v2.0.10'}"
    },
    "exported": {
      "use": "resized",
      "robot": "/s3/store",
      "path": "${fields.category || 'uncategorized'}/${file.name}"
    }
  }
}
Transloadit

Stop hardcoding processing parameters

Transloadit's code evaluation service lets you create intelligent pipelines that adapt to each file automatically.
JavaScript expressions

Use any JavaScript expression inline with dollar-brace syntax.

Access file metadata

Reference file.meta.width, file.meta.height, file.size, and all metadata fields.

Standard library

Use Math, Date, String methods, and other JavaScript built-ins for complex logic.

Fallback values

Handle missing metadata gracefully with || operators and ternary expressions.

Fast execution

Scripts execute in under 1ms with a 1-second timeout for safety.

Cost effective

Simple variable access is free. Only complex JavaScript expressions are charged.

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Demos

See it in action

To give you an impression of our versatility, here is a hand-picked overview of live demos.

Try Transloadit

Try Transloadit for free

Start creating dynamic processing pipelines today with our free plan.
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Hardcoded processing values
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Dynamic expressions
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Missing metadata errors
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Fallback values
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One-size-fits-all processing
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Conditional logic
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Complex dimension calculations
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Math expressions
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Static output filenames
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Dynamic path templates
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Inflexible workflows
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JavaScript-powered pipelines
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No credit card needed · 5 GB included in the free plan