We tested the most popular free image compression tools across privacy, speed, batch support, and compression quality. Here are the results.
| Tool | Privacy | Batch | Limits | Best For |
|---|---|---|---|---|
| Compress2PNG | ✅ Browser-local | ✅ 50 files | None | Everyday use, batch jobs |
| TinyPNG | ❌ Server upload | ✅ 20 files | 5MB/file, 500/month | Quick single images |
| Squoosh | ✅ Browser-local | ❌ Single only | None | Advanced quality tuning |
| Compressor.io | ❌ Server upload | ❌ | 100MB/file | Large single files |
| Optimizilla | ❌ Server upload | ✅ 20 files | Ad-heavy | Quick batch jobs |