KoalaPic vs Squoosh
Batch processing and API vs. client-side single-image compression
The Bottom Line
Squoosh is the gold standard for single-image, hands-on compression with its client-side processing and visual comparison. KoalaPic is built for batch workflows, format conversion, and automation via API and bots. If you're optimizing one hero image and want pixel-level control, Squoosh is fantastic. If you're converting 30 HEIC photos to JPG for a client, resizing for Instagram, or building conversion into your app via API, KoalaPic is the right tool.
Feature Comparison
| Feature | KoalaPic | Squoosh |
|---|---|---|
| Price | 100% free | 100% free |
| Processing | Server-side with 1-hour file retention | Client-side — files never leave your device |
| Batch Processing | ✓ Up to 50 files at once with ZIP download | Single image only |
| Format Conversion | ✓ 155 conversion pairs across 20 input and 11 output formats | Compression/re-encoding only — limited format conversion |
| API Access | ✓ Free REST API with webhooks and SSE streaming | No API — browser-only tool |
| Smart Quality | ✓ Automated SSIM-based optimization | Manual slider with visual comparison |
| Visual Comparison | Before/after comparison tool at /compare/ | Built-in side-by-side real-time comparison |
| Bot Integrations | ✓ Telegram, Discord, WhatsApp, Slack bots | No bot integrations |
| Resize Presets | ✓ 20 platform presets for social media and web | Resize available but no presets |
| Open Source | Closed source | Fully open source (Apache 2.0) |
| Offline Support | PWA with offline page | Full offline support via WebAssembly |
| Camera RAW Support | ✓ CR2, NEF, ARW, DNG, ORF, RW2, RAF input | No RAW camera format support |
Where KoalaPic Excels
- Batch processing of up to 50 images at once with ZIP download
- Full format conversion between 155 pairs (Squoosh is compression-only)
- Free REST API for automation, CI/CD pipelines, and integrations
- Bot integrations for Telegram, Discord, WhatsApp, and Slack
- 20 platform presets for social media and web optimization
- Camera RAW format support (CR2, NEF, ARW, DNG, and more)
Where Squoosh Excels
- Fully client-side — files never leave your device (ultimate privacy)
- Open source under Apache 2.0 license
- Built-in real-time visual side-by-side comparison for compression tuning
Detailed Comparison
Squoosh is Google's open-source image optimization tool that runs entirely in your browser. It processes images client-side using WebAssembly, meaning your files never leave your device. Its visual side-by-side comparison lets you see compression quality in real time before downloading.
KoalaPic takes a server-side approach that enables features Squoosh can't offer: batch processing of up to 50 images, format conversion between 155 pairs, a REST API for automation, resize presets, and messaging bot integrations. KoalaPic also offers smart SSIM-based quality optimization that automates what Squoosh requires you to do manually.
Squoosh is excellent for hands-on, single-image optimization where you want pixel-level control. KoalaPic is built for productivity — converting and compressing multiple files quickly with automated quality optimization.
Frequently Asked Questions
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