Compress Image

What this image compressor does

This tool makes image files smaller. You can compress by quality, moving a slider until the preview looks acceptable, or by target size, where you type a limit in kilobytes and the tool finds the highest quality that still fits. JPG, PNG, WebP and AVIF are supported, and the output format can change at the same time.

Format often matters more than the quality slider. A screenshot saved as PNG is frequently far larger than it needs to be, and converting it to high-quality JPG or WebP cuts the size substantially with little visible change. Photographs are already compressed, so WebP or AVIF usually beats lowering JPEG quality alone.

Batches of up to sixty files are processed together, and results can be downloaded individually or as one ZIP archive.

How to compress images

Compression is quick, and the preview updates so you judge the result rather than guessing.

1. 1Add your imagesDrop in up to sixty files at once. The list shows each original size and the batch total before you change anything.
2. 2Choose quality mode or target size modeQuality mode suits careful visual judgement. Target size mode suits a hard limit, such as a form that rejects heavy uploads.
3. 3Set the value and check the previewSlide down until artefacts appear, then step back up. Target size mode finds the best quality that meets your limit.
4. 4Pick an output formatWebP and AVIF usually give the smallest files, JPG is the most widely accepted, and PNG is right when transparency must be kept.
5. 5Compress and downloadCompare before and after sizes in the results list, then save files individually or take the whole set as one ZIP.

Why compress images here

For hitting an upload limit, shrinking a gallery, and emailing photos that are currently too heavy.

• A target size that is actually metYou state the limit and the tool finds the best quality that fits, so you know the file is small enough.
• Format conversion includedA folder of oversized PNG screenshots becomes compact WebP in one pass instead of two separate jobs.
• Batch work with a real overviewUp to sixty files at once, with the saving shown per file, so the one image that barely shrank stands out.
• No upload, so no upload waitCompression starts immediately rather than after a transfer, and a folder of photographs never leaves your laptop.
• Quality you can see before committingThe preview shows the compressed result, so the decision about visible artefacts is made on the real output.

Your files stay on your device

Compression here is local work. The browser decodes each file, re-encodes it with your settings and offers the result as a download. The site is static and has no backend, so there is no upload endpoint.

That matters for the images people compress most: personal albums, scanned documents, client photography and screenshots of internal dashboards all routinely pass through free online compressors, which receive a full copy first.

Once loaded, the tool keeps working with the network disconnected. Nothing about your files or settings is written to local storage, and closing the tab releases the processed images.

Good to know

• Compression by quality or target size is lossy. Discarded detail is gone for good, so keep your originals and compress copies instead of the only version you have.
• PNG output ignores the quality slider, because PNG compression is lossless. To make a PNG genuinely smaller you must convert it to a lossy format or accept modest savings.
• Target size mode lowers quality until the limit is met. Under a very small limit such as twenty kilobytes the result looks visibly degraded, especially text on a screenshot.
• Converting a transparent image to JPG fills the transparent area with a solid colour of your choosing, so keep PNG, WebP or AVIF output when transparency matters.

Frequently asked questions