Use Case

File Conversion API for Developers

Build with KaijuConverter API

Our RESTful API lets you integrate file conversion directly into your applications. Convert images, documents, video, audio, and archives programmatically with simple HTTP requests.

API Features

300+ formats: Convert between any supported format pair.

Async processing: Submit jobs and poll for completion, or use webhooks.

Rate limiting: Generous quotas starting at 100 free conversions/month.

Quick Start

1. Create an account and generate an API key. 2. POST your file to /api/v1/jobs with target format. 3. Poll the job status endpoint. 4. Download the converted file.

Ready to Convert?

Upload your file and get started in seconds.

Tap to choose your fileDrop files here or click to browse

Automatic format identification and lossless transcoding across 201+ formats.

Select Files

Batch Ready • Up to 10 files / 2GB • Instant ZIP

QUICK INGEST:

Max 25 MB · Free plan · No signup required

Convert to:

Detecting available formats...

Target Max File Size:

Optimize for

Custom output filename (optional)

⚡ Instant In-Browser • 100% Private (0s)

Uploading...

→

Processing your file...

⚡ Need up to 1 GB with no subscription? Grab a 24h Pass (€1.99) or Starter (€3/mo) →

⚡ Converted locally in your browser (0ms upload)

READY!

Download File

Continue with this converted file (0s zero re-upload):

⚡ Install Desktop App for 1-Click Conversions

Batch Conversion Ready!

⚡ Install Desktop App for 1-Click Conversions

Need to convert larger files or bigger batches right now?

Unlock up to 1 GB & priority cloud queue with 1-click Stripe checkout (Apple Pay, Google Pay, Card):

🎟️ 24h Pass · €1.99 one-time (up to 1 GB · no subscription) ⚡ Starter · €3/mo (up to 250 MB) 🚀 Pro · €9/mo (up to 1 GB + 50 Batch) View all plans (up to 2 GB) →

🕒 Recent Conversions (60m Session)

Professional Workstation Solution

Unlimited Batch Jobs Zero Upload Wait Times Direct Disk-to-Disk I/O

Need to Convert Gigabyte Archives or Mass Folders?

KaijuConverter delivers ultra-fast in-memory conversions for everyday tasks. For multi-gigabyte production workloads without browser bandwidth bottlenecks, explore high-throughput desktop suites.

Zero cloud transfer • Native hardware performance

🎟️ 24h Cloud Pass · €1.99 (Up to 1 GB · No Subscription) ⚡ Kaiju Cloud Starter (€3/mo)

24-Hour Day Pass (€1.99 one-time) Up to 1 GB · No subscription

One-time payment with zero recurring commitment: convert files up to 1 GB and 50-file batches for 24 hours.

Instant Stripe Checkout →

Kaiju Cloud Starter (€3/mo) Up to 250 MB / file

Convert large videos, PDFs, and lossless audio directly in your browser—100% ad-free with priority queue.

Instant Stripe Checkout →

Kaiju Cloud Pro (€9/mo) Up to 1 GB + 50 Batch

High-throughput cloud pipeline for files up to 1,024 MB, 24-hour encrypted storage, and priority processing.

Instant Stripe Checkout →

ImageMagick CLI / XnConvert Free • Mass Batch

Convert thousands of camera RAW files (CR3, NEF, ARW) to WebP, AVIF, or TIFF in one pass.

Affinity Photo / Adobe Lightroom Photo Pro

GPU-accelerated RAW development with end-to-end 16-bit ICC color profile management.

Compare all Cloud & API plans (up to 2 GB) Read full local architecture guide

Frequently Asked Questions

Our File Conversion API for Developers workflow curates the most compatible industry-standard formats (such as WEBP/AVIF for web, MP4 H.264 for messaging, and PDF/DOCX for office workflows) so your files open everywhere without errors.

Yes. You can drag and drop up to 10 files at a time into the converter widget, adjust Studio quality or size presets, and download them individually or as a combined ZIP archive.

Yes. You have full control over quality sliders, target byte limits (20 KB, 50 KB, 100 KB), resolution, and DPI so you get the smallest file size with zero visible artifacts.

Yes. All tools and format converters on KaijuConverter are completely free for both personal and business workflows, with no watermarks and automatic 60-minute file deletion.