TinyPNG is the most well-known online image compression tool. Compress Image by Caitty is a newer alternative with a different approach — particularly around privacy and pricing. Here's how they compare.
Feature Comparison
| Feature | Compress Image | TinyPNG |
|---|---|---|
| Processing | ✅ Browser-local (Canvas API) | ☁️ Server-side upload |
| Privacy | ✅ Images never leave your device | ⚠️ Uploaded to TinyPNG servers |
| Formats | JPEG, PNG, WebP, GIF | JPEG, PNG, WebP |
| Quality control | ✅ Adjustable slider (30–100%) | ❌ Automatic only |
| Format conversion | ✅ Convert between formats | ⚠️ Limited |
| Batch processing | ✅ Unlimited files per batch | ✅ Up to 20 per batch |
| ZIP download | ✅ One-click ZIP | ✅ ZIP available |
| Free tier | 10/day-one, 5/day after | 20 per batch (unlimited batches) |
| Free file size limit | 5 MB | 5 MB |
| Paid plan | $29 lifetime | $39/year (Pro) or API pricing |
| API | ❌ No | ✅ REST API available |
Where Compress Image Wins
- Privacy: Processing happens entirely in your browser. Your images are never uploaded. This matters for confidential client work, medical images, internal product shots, and anything under NDA.
- Quality control: You choose the compression level with a slider. TinyPNG makes the decision for you — which is convenient but removes creative control.
- Pricing: $29 once, forever vs $39/year. After 9 months, Compress Image Pro is cheaper.
- Format conversion: Drop a PNG, get a WebP. Drop a JPEG, get a PNG. TinyPNG is more limited here.
Where TinyPNG Wins
- Free tier generosity: TinyPNG lets you compress 20 images per batch with no daily cap. Compress Image gives 10 on day one and 5/day after.
- API access: TinyPNG has a well-documented REST API for build pipelines and automated workflows. Compress Image doesn't offer an API.
- Compression quality: TinyPNG's server-side engine (pngquant + custom algorithms) can produce slightly better results than browser-based Canvas compression, especially for PNG files.
- Brand recognition: TinyPNG has been around for 10+ years and is widely trusted in the developer community.
Verdict: Choose Compress Image if privacy, quality control, and lifetime pricing matter to you. Choose TinyPNG if you need an API, handle very high volumes, or prefer a tool with an established track record.
🔧 Try Compress Image — Free, Private, No Upload
See the difference for yourself. Drop an image and compare quality at different compression levels.
Open Compress Image →