A free TinyPNG alternative that compresses locally
PNG and JPG compression is a job your browser can do on its own. Tool Genie re-encodes images with the quality you choose, shows the exact saving, and never sends the file anywhere.
You set the quality, not a fixed preset
A slider controls the trade-off, with the resulting file size shown live. Hero images and thumbnails rarely want the same setting.
No per-batch file cap
Drop in up to 20 images per run, as many runs as you like, and take them away as a ZIP.
Convert while you compress
Switching a PNG screenshot to WEBP usually saves far more than compressing the PNG, and both happen in the same tab.
Private by construction
Unreleased artwork and client mockups are processed on your machine, so there is no copy sitting in someone's cache.
| Tool Genie | Typical online tool | |
|---|---|---|
| Where images are processed | In your browser | Uploaded to a server |
| Files per batch | 20 | Often capped on the free tier |
| Quality control | Slider, live preview | Usually automatic |
| Format conversion | JPG, PNG and WEBP | Depends on the service |
| Price | Free, every tool | Free tier plus paid plans |
Indicative comparison — other services change their plans and limits over time. Tool Genie is not affiliated with TinyPNG.
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Frequently Asked Questions
Is compression lossless?
It is lossy re-encoding, which is what makes big savings possible. At the default quality the difference is invisible at normal viewing size.
Does transparency survive?
Yes when the output is PNG or WEBP. Converting to JPG flattens transparency onto a white background, since JPG has no alpha channel.
What about very large images?
Up to 100 MB per file works. Since everything happens in memory, extremely large images depend on how much your device can hold at once.