Both Aizen and TinyPNG will make your images smaller for free. The difference is how they do it — and that difference matters more than most people realize, especially for privacy and control. Here is an honest, side-by-side comparison.
Quick answer: Choose Aizen if you want your images to stay on your device, need a manual quality slider, or want to resize and convert format in the same step. Choose TinyPNG if you prefer a fully automatic, upload-based service and do not mind your files being processed on a remote server.
At a glance
| Feature | Aizen Image Compressor | TinyPNG |
|---|---|---|
| Price | Free, unlimited | Free tier with monthly limits; paid for more |
| Where compression happens | In your browser (local) | On TinyPNG's servers (upload) |
| Privacy | Files never leave your device | Files uploaded to a third party |
| Formats | JPG, PNG, WebP | PNG, JPG, WebP |
| Quality control | Manual slider (30–100%) | Automatic |
| Resize while compressing | Yes | Limited (paid/API) |
| Convert format while compressing | Yes | Partial |
| Sign-up required | No | No (free tier), yes for higher limits |
| Watermark | Never | Never |
| Works offline | Yes, after first load | No |
Privacy: the biggest difference
TinyPNG is an upload-based service: your image is sent to its servers, compressed there, and downloaded back. That is convenient, but it means your files are handled by a third party — a real concern for ID documents, medical images, contracts, or client work under an NDA.
Aizen is local-first: the compression runs in your browser using the Canvas API, so the image never leaves your computer or phone. For anything sensitive, this is the safer choice by default.
Callout: If you would not email an image to a stranger, you probably should not upload it to a remote compressor either. Local processing removes that risk entirely.
Control vs automation
TinyPNG makes one decision for you — it picks a quality level automatically and returns a smaller file. That is great when you just want "make it smaller" with zero thinking.
Aizen hands you the quality slider, a maximum-width resize, and format conversion in a single pass. That control matters when:
- You need to hit a specific size budget (e.g. under 100 KB).
- You want to resize an oversized photo and compress it at once.
- You want to convert a heavy PNG straight to WebP.
Limits
TinyPNG's free tier limits how many images you can compress and caps file size. Because Aizen runs on your own hardware, there is no monthly quota and no server-imposed size cap — the only limit is your device's memory.
Which should you choose?
- Pick Aizen for privacy-sensitive files, manual control, resizing, format conversion, offline use, or unlimited compression.
- Pick TinyPNG if you want a hands-off automatic service and are comfortable uploading your files.
For most people who care about privacy and want more control, the browser-based approach wins. Try the Aizen Image Compressor and see the before/after numbers for yourself — then read our full image compression guide to get the settings right.