Smart Image Optimizer: Automatic Compression

The Smart Image Optimizer is the page to use when you have a folder of mixed images and simply want them lighter without thinking about settings. It starts from a quality of 80, keeps each file's dimensions and keeps its format: a JPG stays a JPG, a WebP stays a WebP, and a PNG is re-encoded with a reduced colour palette while its transparency is preserved.

"Smart" here means rule-based decisions, not an AI model. For PNG files the optimizer builds a palette version and a lossless version and keeps whichever is smaller, so a photo saved as PNG is not made bigger by palette reduction. Switch to Target size and it searches for the highest quality that still fits under your limit, shrinking the dimensions only if even a low quality is too large.

How to use the Smart Image Optimizer

1. Drop your images onto the upload area, click it to choose files, or paste an image with Ctrl+V. This page accepts JPG, PNG, WebP, GIF and BMP files, many at once and up to 80 MB each.
2. Leave the defaults for a quick result, or move the quality slider: 80 is a safe middle, 70 gives smaller files for web use, 90 keeps more detail for images you may edit again.
3. If you need a hard limit (for example 200 KB for an upload form), click Target size, type a value or choose one of the buttons from 20 KB to 1 MB; the result shows the quality that was actually used.
4. Check the result with the before/after slider: drag the divider across the preview and read the new dimensions, file size, quality and percentage saved underneath. Any change to the settings re-processes every image automatically.
5. Download a single image, or use Download all (ZIP) for the whole batch. Under More options you can also set a DPI value and a file-name pattern with {name}, {w} and {h}.

When the smart defaults work best

• Mixed batches. Screenshots, logos and camera photos can go in together; each keeps a format that suits it, so there is no need to sort files first.
• Size limits on forms and email. Target size takes the guesswork out of "must be under 100 KB" rules. For fixed limits there are also ready pages such as compress image to 100KB.
• Camera photos. The EXIF orientation is applied before compression, so portrait shots come out upright, and the metadata is dropped, which also saves a few kilobytes.
• Large folders. For dozens of files at once the bulk image compressor uses the same engine; the plain image compressor is its manual counterpart.

If a result shows a "+%" badge instead of a saving, the original was already well compressed: choose a lower quality or simply keep the original file.

Private, free and fast

The whole job runs in your browser: images are decoded, resized and re-encoded on your own device, so nothing is uploaded to a server. There is no sign-up, no watermark and no daily limit, and location and camera data (EXIF) are removed from every result.