TinyPNG is a hosted service, not a local one
TinyPNG built its reputation on one specific job: shrinking PNG, JPG, and WebP files to a smaller size with very little visible quality loss. The product is excellent at that job. It is also explicitly a web service. The TinyPNG site accepts your image, uploads it to TinyPNG infrastructure operated by Voormedia, runs the compression there, and gives you a download link. The handling and retention model is described in the TinyPNG terms and privacy pages.
That is fine for public marketing assets. It is less ideal when the image is unreleased product art, a screenshot of an internal dashboard, an event photo of a person who has not approved publication, or any other asset where “do not upload” is a real requirement.
VaultTools takes the opposite default. The Image Compressor runs in your browser. Files are read into memory, compressed locally through WebAssembly, and never sent to a server. The same is true for Image Converter, Image Resizer, EXIF Viewer / Remover, and Image Watermark.
Why that matters in practice
Compression is rarely the only thing happening to an image. Real workflows look more like:
- a designer prepares a mockup, strips EXIF, then compresses for delivery
- a journalist resizes a source photo, removes location metadata, then compresses for the CMS
- an indie team converts HEIC iPhone shots to JPG, resizes, then compresses
- an agency adds a watermark to a draft preview, then compresses before sending
Doing the whole chain inside one local stack means the asset never leaves your machine, and you do not have to evaluate the privacy posture of three different web services. TinyPNG handles compression well, but the rest of the chain still has to happen somewhere, and “somewhere” is often another upload.
Where TinyPNG still has advantages
TinyPNG earned its reputation honestly.
- The compression results on PNG, JPG, and WebP are widely respected.
- The Tinify API gives developers a clean way to plug compression into a build pipeline or CMS, which a browser-only tool cannot replace.
- The web interface is fast, familiar, and well known across product teams.
The honest framing is narrower. If the asset is non-sensitive, public, or already released, and you specifically want a hosted service or an automation API, TinyPNG is still a strong product. If the asset is private, the device is the right place to compress it, and you also need convert, resize, EXIF, mockup, or watermark in the same workflow, the local stack is the better fit.
What to use instead
If your search began with “TinyPNG alternative” and the real concern is keeping image assets local, build the workflow around the actual job:
- Use Image Compressor for the PNG, JPG, or WebP shrink step that brought you to TinyPNG in the first place.
- Use Image Converter for format changes between PNG, JPG, WebP, and AVIF.
- Use Image Resizer for delivery dimensions before compression.
- Use EXIF Viewer / Remover to strip GPS and camera metadata before publishing.
- Use Image Watermark for draft and preview protection.
That gives you the TinyPNG outcome (smaller, web-ready files) plus the rest of the image pipeline, without uploading the asset to anyone.