TinyPNG is the tool most web developers reach for when a page fails a speed audit. Drop in your images and it returns versions that are typically 50–70% smaller, with a difference most people cannot see.
The technique is called quantisation: instead of blurring pixels the way a naive JPEG re-save does, it reduces the number of distinct colours in the file and, where possible, switches to a more efficient encoding. For PNGs with transparency it uses a palette-based approach that preserves alpha channels. The result is a genuinely smaller file without the smeared artefacts of aggressive JPEG compression.
The practical impact is large. A hero image that was 1.8MB comes back at perhaps 550KB, which meaningfully improves page load time and Core Web Vitals scores — the metrics Google uses as ranking signals.
There is a free tier with a per-batch image limit, plus a paid option and an API for automated build pipelines.
| Registration | Not required for the web tool |
|---|---|
| Watermark | None |
| Free tier | Limited number of images per batch (API has a monthly free allowance) |
| Typical saving | 50–70% reduction |
| Supported formats | PNG, JPEG, WebP |
| Transparency | Preserved for PNG |
| Extras | API for automated optimisation, Photoshop plugin |
Check before you rely on it: free quotas, file limits and pricing change frequently. Confirm current terms on the official site before depending on it for regular work.
Web developers optimising page speed, designers preparing assets for a site, and anyone whose CMS or email rejects uploads for being too large. It is particularly effective on screenshots, logos and flat-colour graphics.
It uses lossy compression, so technically yes — but it works by reducing the colour palette rather than blurring detail. For most images the difference is invisible to the naked eye.
Yes, PNG transparency is preserved, which is one of its main advantages over simply converting to JPEG.
The browser tool accepts a limited batch per upload. The API has a monthly free allowance; beyond that it is paid.
Yes, WebP is supported alongside PNG and JPEG.
Yes, with client libraries for several languages, commonly wired into deployment pipelines.
Yes, but continuous-tone photos with skies or gradients sometimes band. Check those at 100% zoom before publishing.