Compress images without uploading them

About this tool

Compress Image makes photos and pictures take up less space while keeping them looking the same to the eye. A typical phone photo is several megabytes, which is too big for many upload forms, slow to email and heavy on a website. This tool re-saves the image more efficiently, and can shrink its pixel size too if you need it smaller still.

It is built for anyone with a file that is “too large”: someone filling in a visa or job application with a size limit, a shop owner preparing product photos, a blogger who wants pages to load faster, or a developer trimming images before a release.

The difference from most compression sites is where the work happens. Big services send your photo to their servers, process it there and send it back. Here, your own browser does the compressing, so the picture never leaves your phone or computer. There is no account, no daily limit, no watermark and no waiting in a queue — and because nothing is uploaded, it is often faster, especially on slow connections.

How to use Compress Image

1. Tap “Choose files”, drag images onto the box, or paste one with ⌘V / Ctrl+V. You can add up to 50 at once.
2. Each image starts compressing straight away at quality 75, which suits most photos. Watch the before and after size appear on each row.
3. Want it smaller? Move the Quality slider left and let go — every image is redone with the new setting. Move it right if you can see a difference.
4. Optional: open “More options” to make large images narrower, for example 1920 px for a website or 800 px for email.
5. Press “Download” to save one image, or “Download all (.zip)” to get the whole batch in a single file.

ExampleA 4.1 MB photo from a phone camera usually comes out well under 1 MB at quality 75 with no visible change. Choosing 1920 px wide as well often takes it to a few hundred KB.

Features

• Works with JPG, PNG, WebP, AVIF, GIF and BMP images.
• Batch mode: compress up to 50 images in one go and download them together as a .zip file.
• Quality slider from 10 to 95, with a plain-English hint for each setting.
• “Auto” format keeps JPG as JPG and WebP as WebP, and turns PNG, GIF, BMP and AVIF into WebP, which keeps transparent backgrounds and is usually far smaller than PNG.
• Or choose the format yourself: JPG, WebP or lossless PNG.
• Optional resize to common widths (4K, 2560, Full HD, 1280 and 800 px) without stretching the picture.
• Never makes a file bigger: if an image is already well compressed, your original is kept and marked “Already small”.
• The heavy lifting runs in a background worker, so the page stays responsive while a big batch is processed.

Tips and good to know

• For photos, quality 70–80 is the sweet spot. Below about 50 you may start to see blocky patches in smooth areas like skies.
• Screenshots, logos and drawings with flat colour often get smaller as WebP than as JPG, and they keep crisp edges.
• If a form needs an exact limit like “under 200 KB”, lower the quality first, then try a smaller width under “More options”.
• Compressing removes hidden photo details (EXIF), including the GPS location many phones save. That is good for privacy, but it also drops the date taken.
• Animated GIFs are saved as a still image of the first frame. Keep the original if you need the animation.
• iPhone HEIC photos can’t be opened by most browsers yet. Set the camera to “Most Compatible” or share the photo as JPG before adding it.