TinyPNG Alternatives: 5 Free Image Compressors That Keep Files Local
TinyPNG (and its sibling TinyJPG) are great at what they do: compress PNG and JPG files with very little visible quality loss, and handle up to 20 images at a time on the free web version. But the files are uploaded to their server for compression. If the images are passport photos, signature scans, or screenshots of sensitive documents, uploading them anywhere can be a concern. Here are five alternatives, including our own Toolzo compressor, that either keep your files entirely on your device or give you more control over what leaves it.
A note: Toolzo is an independent, free browser‑based tool. We are not affiliated with TinyPNG or any other brand mentioned in this article. This comparison comes from what Indian users tell us matters when they switch.
Where TinyPNG gets it right
TinyPNG's compression is smart: it reduces the colour depth on PNGs (quantisation) and optimises JPEGs aggressively while keeping the image surprisingly sharp. The batch upload of up to 20 files at 5 MB each is generous. The paid API is widely used by developers. The privacy policy says uploaded files are deleted within an hour. For non‑sensitive images, blog photos, product images, social media graphics, it remains one of the best tools online. The search for alternatives usually starts with privacy, the 5 MB per‑file cap, or the need for offline compression.
How the alternatives compare
| Tool | Uploads to server? | Free limit | Batch support? | Works offline? |
|---|---|---|---|---|
| TinyPNG (online) | Yes | 20 images / 5 MB each | Yes | No |
| Toolzo (our tool) | No, client‑side | No cap | One at a time | Yes, after page load |
| Squoosh | No, client‑side PWA | No cap | No | Yes, after page load |
| Compressor.io | Yes | 10 MB per file | No on free | No |
| iLoveIMG | Yes | Hourly task cap | Yes | No (online), yes on mobile app |
| Caesium (desktop) | No, local app | No cap | Yes | Yes, fully offline |
Exact limits can change; check the competitor's current plan page for real‑time numbers.
Who each alternative suits best
Toolzo Image Compressor: privacy first, no caps
Toolzo's image compressor runs inside your browser. The engine compresses locally, so your photo or signature never goes to a server. There is no file size limit beyond what your device memory can handle, and no daily cap. The quality slider lets you dial in the trade‑off between size and sharpness. This is the right fit when you are compressing a single sensitive image, a passport photo for an SSC form, a scanned Aadhaar, and you want it done without any upload. The trade‑off: batch compression is not supported. If you have 50 product images, you will be clicking one by one.
Squoosh: live preview and ultimate control
If the one thing you miss from TinyPNG is not knowing exactly how much quality you are losing, Squoosh solves that with a live side‑by‑side preview. You slide a split bar across the image and zoom in to compare the original and compressed versions. It supports JPG, PNG, WebP, AVIF, and others. Works fully offline as a PWA. The drawback: no batch processing, and the interface is more technical than a one‑click tool.
Compressor.io: strong compression, but files leave your device
Compressor.io offers lossy and lossless modes for both JPG and PNG. The compression is among the best, comparable to TinyPNG in quality. The free tier allows files up to 10 MB, which is double TinyPNG's limit for single files. But it uploads to a server, so the same privacy caveat applies. Good for large non‑sensitive images where TinyPNG's 5 MB cap is too tight.
iLoveIMG: batch and mobile, but uploads
iLoveIMG's online compressor handles batch uploads and produces clean output. The free tier has an hourly task limit rather than a per‑file cap. Their mobile app can compress offline if the photo is stored locally. If you are already in the iLovePDF ecosystem, this is a natural fit. But the online tool uploads to their server, so it does not meet the offline/local requirement.
Caesium: desktop, batch, fully offline
Caesium is a free, open‑source desktop app for Windows and Linux (with a community Mac build). It compresses JPG, PNG, and WebP in batches, with a live preview of output size and quality. It runs entirely on your machine, with no internet needed. If you regularly compress dozens of images on a laptop, this is the closest desktop equivalent to TinyPNG's workflow, minus the upload.
Limitation: It requires installation. No mobile or browser version. The interface, while functional, is not as polished as paid alternatives.
What about TinyPNG's WordPress plugin and API?
TinyPNG's paid API and WordPress plugin are deeply integrated into many developer workflows. If you are a developer auto‑compressing images on upload to a site, the alternatives listed here are not drop‑in replacements for that pipeline. For manual, one‑off compression of personal images, the tools above are practical alternatives.
Who should pick what
If you compress a single passport photo or signature for an Indian government form and want it done without any upload, Toolzo's image compressor is the simplest choice. If you need to see the exact quality loss before saving, Squoosh is unmatched. If you have dozens of non‑sensitive images to batch‑compress on a laptop, Caesium is the strongest free offline option. And if you already use and trust iLovePDF/iLoveIMG, their online compressor with batch support is a solid alternative, as long as you are comfortable with the upload step.