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RankBrain

Image Compressor

Re-encodes JPEG, PNG and WebP images locally at a chosen quality or towards a target file size.

Runs in your browser. The file or text you give it is not uploaded. Free, no account.

Finding the problem is the first half.

Heavy images can slow a page. RankBrain helps inspect image delivery and implement reviewed changes in your site.

RankBrain works on websites built in code, through the AI tool you already use (Cursor, Claude Code, Codex, ChatGPT).

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How it works

You have photos or screenshots too large to upload or email. Drop them in and your browser does the work: each image is decoded and re-encoded on your machine, and nothing is sent anywhere. You see the size before and after, then download files singly or as a ZIP.

  1. 1

    Drop in one or many images. Each is decoded and re-encoded by your browser; nothing is uploaded.

  2. 2

    Set a quality, or a target such as 100 KB. For a target, the tool searches for the highest quality that fits, and reduces the dimensions only if quality alone cannot get there.

  3. 3

    You see the size before and after for every file, and download them one by one or as a ZIP.

What it does not do

  • PNG is lossless, so a photo saved as PNG shrinks far more when converted to JPEG or WebP. The tool offers that.

  • If a target cannot be reached without ruining the picture, you are told and given the closest result.

When a source is busy or a site does not answer, this tool says so. It never fills the gap with a guess.

Questions

How do I get an image under 100 KB?

Switch to "To a file size", choose 100 KB and let the tool search. It finds the highest quality that fits, and lowers the dimensions only if quality alone cannot get there. Each file shows its size before and after. If the target cannot be reached without ruining the picture, you are told and given the closest result.

Why did my PNG barely shrink?

The tool shrinks a PNG by reducing it to up to 256 colours. An image that already uses few colours, such as a flat logo or a screenshot of text, has little left to remove. A photo saved as PNG is a different case: it shrinks far more as JPEG or WebP, which you can choose under "Save as".

Are my images uploaded to a server?

No. Your browser decodes and re-encodes each image, and nothing is uploaded, so the files stay on your machine. Download them one by one or as a ZIP when you are done. Speed depends on your own device, so a large batch takes longer than a single photo.

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