Optimize Images Automatically

Drop your images and let Pixellin choose the settings. It tests several quality levels and keeps the smallest file that still looks identical to the original.

On-device
No sign-up
Batch
Free, no watermark

Drop images on the plate

or paste with Ctrl/⌘ V

JPG, PNG, WebP, AVIF Up to 200 files · 50 MB each

Processed on this device

How it works

01Drop, choose or paste JPG, PNG, WebP or AVIF images.
02Optionally pick a long-edge cap of 1920, 2560 or 3840 px.
03Select Process; each image is tuned automatically.
04Download each file or select Download all for a ZIP.

Why use this tool

No settings to guess

Pixellin measures visual similarity with SSIM and picks the quality for each image, instead of applying one value to all of them.

Metadata removed

Camera data, GPS and other metadata are stripped, which saves bytes and keeps location details off your website.

Optional web size cap

Cap the long edge at 1920, 2560 or 3840 px so oversized camera photos don’t ship at full resolution.

Supported formats

Input

Output

Use cases

Preparing a site launch

Run every image destined for a new website through the optimizer so pages load faster without anyone hand-tuning quality settings.

Client photo deliveries

Give clients web-ready versions of a shoot that look the same as the originals but weigh less and carry no GPS data.

Mixed media folders

Optimize JPG photos, PNG graphics and WebP images together; each keeps its format and gets its own tuned setting.

Technical details

Optimizing is not the same as compressing. On the compress pages you choose a quality value. Here Pixellin encodes each image at several quality levels, compares every result with the original using SSIM, a measure of structural similarity, and keeps the smallest file that stays above a “visually identical” threshold. Busy photos and flat graphics end up at different settings, because each image is judged on its own.

Each file keeps its format. PNGs are recompressed losslessly with OxiPNG, with palette reduction used only if it stays visually identical. Metadata is stripped, and an optional long-edge cap of 1920, 2560 or 3840 px brings oversized photos down to sizes screens actually display. If you prefer manual control, use Compress Images. For the wider process, see the website image guide.

Your files stay with you

This tool runs entirely inside your browser using Web Workers and WebAssembly. Your images are never uploaded, never stored on a server and never used to train AI. Close the tab and they’re gone. Learn more

Frequently asked questions

What is the difference between optimizing and compressing an image?

Compressing applies the quality you choose. Optimizing is automatic: Pixellin tries several quality levels, measures how close each is to the original with SSIM, and keeps the smallest one that still looks identical. It also strips metadata and can cap dimensions.

Will optimized images look different?

They are chosen to look the same. Each candidate is scored for visual similarity, and only results above a “visually identical” threshold are kept. PNGs go further: they are recompressed losslessly, so their pixels don’t change at all.

What size should images be for a website?

Many layouts never display an image wider than about 1920 px, so a long-edge cap of 1920 suits typical pages. Choose 2560 or 3840 px for full-screen photography or high-density displays. Pixels beyond what the layout shows mostly add bytes nobody sees.

Does optimizing remove EXIF and GPS data?

Yes. Metadata is stripped during optimization, which removes camera details and location data along with the bytes they take up. If you only want to remove metadata without re-encoding the image, use the Remove EXIF Data tool instead.

Are my images uploaded for optimization?

No. The encoding and the SSIM comparisons all run in your browser, using WebAssembly codecs in background workers. That is why large batches depend on your device’s speed, and why nothing ever reaches a server.