Compress PNG and JPG Images Without Uploading — TinyPNG Alternative
TinyPNG is the most popular image compression tool on the web — but it uploads every image to their API for server-side quantization. BigWow delivers the same result (up to 80% size reduction) using client-side canvas APIs — your photos never leave your device.
0 images uploaded vs TinyPNG's mandatory server-side API.
Up to 80% size reduction using client-side quantization.
No 20-images-per-month limit — BigWow has unlimited batch processing.
BigWow vs TinyPNG — Feature Comparison
| Feature | BigWow | TinyPNG |
|---|---|---|
| Uploads your images | Never | Always |
| Monthly free limit | Unlimited | 20 images/month |
| Works offline | Yes | No |
| Supports bulk batch | Yes | Paid only |
| Account required | No | For API access |
Frequently Asked Questions
Does TinyPNG upload my images to their servers?
Yes. TinyPNG sends every image to their API for server-side processing. BigWow compresses images entirely in your browser — your photos are never uploaded.
Can I compress images with transparent backgrounds locally?
Yes. BigWow's local compressor preserves PNG alpha transparency during quantization.
Sources & References
- TinyPNG API documentation confirming images are uploaded and processed on their servers.
- W3C Canvas 2D Context API specification for local image data manipulation.
Try it now — 100% free, zero upload
No account, no ads, no file size limits. Opens instantly in your browser.