5 Best Free Image Compressors in 2026

There are dozens of free image compressors online, and most of them do roughly the same thing. So I tested five of the most popular ones with the same set of images and compared what actually matters: compression results, privacy, speed, format support, and usability.

Here are the five tools worth using in 2026, ranked.

1. MiniPx — best for privacy and batch compression

MiniPx compresses images entirely in your browser. No uploads, no servers, no signup. It supports JPEG, PNG, WebP, AVIF, and even HEIC (iPhone photos) as input. You can compress to a target file size — say, 100 KB for a form submission — which none of the other tools on this list do as well.

Batch compression works with no file count limit. Drop 50 images, pick a preset (Smart, Balanced, or Tiny), and download them all. The whole process takes seconds because nothing travels over the network.

Best for: Anyone who cares about privacy, needs batch compression, or wants target file sizes. Works great on mobile.

2. Squoosh — best for codec experimentation

Built by the Google Chrome team, Squoosh gives you fine-grained control over compression. You can choose from MozJPEG, OxiPNG, WebP, AVIF, and JPEG XL, then tweak quality, effort, and chroma subsampling. A side-by-side slider lets you compare the original and compressed versions pixel by pixel.

The catch: it only handles one image at a time, the mobile experience is clunky, and development has slowed down considerably. But for testing how different codecs handle a specific image, nothing beats it.

Best for: Developers who want to compare codecs and fine-tune compression settings.

3. TinyPNG — best API for automation

TinyPNG has been around since 2013 and it works well. Upload a PNG or JPEG, get a smaller file back. Their custom compression algorithm produces consistently good results, especially for PNG files where they can sometimes beat browser-based tools by 5-10%.

The free tier is limited to 500 images per month with a 5 MB file size cap. The real value of TinyPNG is their API and WordPress plugin, which let you automate compression in your build pipeline. The downside: all your images are uploaded to their servers.

Best for: Developers who need automated compression via API or WordPress plugin.

4. iLoveIMG — best all-in-one image editor

iLoveIMG is more than a compressor — it is a full image editing suite. Compress, resize, crop, convert, add watermarks, and more. The compression results are decent (70-75% reduction on JPEG), and the interface is clean.

The free tier limits you to 15 images per batch and shows ads. All images are uploaded to their servers. If you need a one-stop shop for basic image editing and do not mind the server upload, it works.

Best for: Non-technical users who need multiple image editing tools in one place.

5. Compressor.io — best visual quality preview

Compressor.io offers both lossy and lossless compression with a nice visual preview showing the quality difference. It supports JPEG, PNG, GIF, SVG, and WebP. Compression results are solid — comparable to TinyPNG.

The free tier is limited to one image at a time with a 10 MB cap. Like TinyPNG and iLoveIMG, your files are uploaded to their servers. The UI is straightforward but lacks batch support in the free version.

Best for: Users who want to preview quality differences before downloading.

Quick comparison table

The right tool depends on what you need. For privacy and batch compression, MiniPx wins. For codec experimentation, Squoosh is unmatched. For API automation, TinyPNG is the standard. For most everyday compression tasks, any of the top three will serve you well.

Frequently asked questions

Compress, convert, and resize images in your browser. Nothing gets uploaded.