When you compress sensitive photos—scanned documents, personal ID images, product photos for your business, or client work—you don't want those files sitting on a third-party server. Cloud services can be breached, misused, or accidentally retained long after processing. Most people use TinyPNG for years without ever reading their privacy policy, assuming that because the service is free and reputable, their files are safe. That's a risky assumption.
Many users don't realize that popular online compressors like TinyPNG, CompressJPEG, and Squoosh upload your files to remote servers before they send back the smaller version. That means your private images pass through a third party you can't control. In 2025, a small business owner in Berlin shared that he had compressed 400+ unreleased product photos on TinyPNG ahead of a holiday launch, only to discover a competitor listing identical products on his biggest sales platform two weeks later. While the leak was never definitively traced to the compression tool, it serves as a reminder: every time you upload proprietary images to a cloud service, you add one more point of failure for your business.
Per TinyPNG's official public privacy policy, uploaded images are stored on their servers for approximately one hour after compression, then automatically deleted. They also state they do not sell or share user images with third parties. That's a reasonable policy for a cloud tool, but it still means your files are sitting on a server you don't own for an hour—long enough for a breach, a misconfigured access control, or an internal error to expose them.
| Feature | TinyPNG | SmartImgKit |
|---|---|---|
| Uploads images to servers? | Yes, all files are uploaded to cloud | No, 100% local browser processing |
| Free compression limit | 5MB per image, 20 images per batch | No file size limit, no batch limit |
| Ads on page | Yes, banner and sidebar ads | No ads, clean interface |
| Account required | No account needed | No account needed |
| Compression ratio | 70-85% reduction | 70-85% reduction |
| Runs offline after page load? | No, requires constant internet | Yes, works on planes / no WiFi |
| Your files retained? | Temporarily stored ~1 hour on servers | Never leaves your device |
| Manual quality control? | Automatic only, no sliders | Adjustable quality slider 1-100 |
You can prove SmartImgKit never uploads your images in 10 seconds. Open Chrome, press F12 to open Developer Tools, go to the Network tab, check "Preserve log", then compress an image. You will see zero upload requests to any external server—all processing happens locally in your browser. This test works for every web tool: if you see a large POST request immediately after selecting an image, that file is being sent to a remote server.
This is the core difference: SmartImgKit uses modern browser APIs (Canvas, WebAssembly, and the open-source mozjpeg compression engine) to compress images directly on your device. There is no server round-trip, no data sent to us, no logs of your photos. We use the exact same compression algorithm that TinyPNG uses, which is why the quality and compression ratios are nearly identical—we just run it on your hardware instead of ours.
Choose TinyPNG if you need one-click compression for totally public, non-sensitive images—like compressing a stock photo you downloaded for a blog post—and you don't mind files passing through a third-party server. It's a well-built tool, and its temporary retention policy is industry standard.
Choose SmartImgKit if you care about privacy, need to compress sensitive documents (ID scans, client work, unreleased product photos), want to process huge batches without hitting the 20-image-per-batch limit, or need to work offline. For e-commerce sellers processing hundreds of product photos at a time, SmartImgKit's unlimited batch size and local processing are a strict upgrade—you don't have to split 100 product images into 5 separate 20-image batches, and none of your proprietary product assets ever leave your computer.
A common objection people have when they hear about local browser tools is: "If it's running on my laptop, how can it compress as well as a cloud service with powerful servers?" The answer is that image compression isn't a heavy AI task—it's a deterministic algorithm. Both TinyPNG and SmartImgKit use the same open-source mozjpeg library, which is the industry standard for JPEG compression. There is no "cloud magic" happening on TinyPNG's end; they're running the exact same code you'd run locally, just on their servers. That's why the compression ratios, file sizes, and visual quality are nearly identical across both tools. The only difference is where the code runs: on your device, or on a third-party server.
Certain groups of users face far higher risk when they upload images to cloud compressors:
You might wonder: if TinyPNG and similar cloud tools are free, how do they pay for all that server storage and bandwidth? The answer is simple: they show ads, and in many cases, they use anonymized uploaded image data to train and improve their AI processing models. That's a sustainable business model for them, but it means your images are a product, even if you don't pay cash for the service. Local tools like SmartImgKit don't need your images at all—we run the code on your hardware, so our server costs are almost zero, which means we don't need to monetize your data to stay in business. That's the core difference: when you use a local tool, you are the customer, not the product. We don't need to track your images, sell your data, or show you intrusive ads to keep the service running today.