Image Compressor - Free Online, No Sign-Up

This free image compressor shrinks JPEG, PNG, WebP and GIF files so your pages load faster and your uploads stay small. Add up to 10 images at once, up to 5 MB each, keep the Auto setting or choose a quality level, then download each result with the exact KB saved shown beside it.

What Is Image Compression?

Image compression is the process of reducing an image's file size by storing its pixel data more efficiently. Smaller files download faster, use less bandwidth and take up less storage.

There are two broad approaches. Lossless compression rewrites the file without discarding any visual information. Lossy compression removes detail the eye rarely notices, such as tiny color variations in a photo. Lossy methods usually save far more space, and the trade-off is that pushing them too hard causes blur, blocky patches or banding in gradients.

File size is not the same as image dimensions. A photo that is 4000 by 3000 pixels is large because it has 12 million pixels, and compression alone will not change that. If you need fewer pixels, use an image resizer first, then compress the result.

How to Use the Image Compressor

You can compress a batch of images in a few clicks, and no account is needed. Follow these steps:

1. Drag and drop your files into the box labeled "Drag & drop images here or click to browse", or click it to pick files from your device.
2. Check the list of selected files. Use "Add More" if you want to include extra images, up to 10 in total.
3. Leave "Compression Quality" on Auto for a balanced result, or drag the slider toward "Max Quality" in steps of 5 to keep more detail.
4. Click "Compress Files".
5. Review the result for each image: Original size, Compressed size and the percentage Saved.
6. Click "Download" beside a single image, or "Download All" when you compressed more than one. Choose "Compress More Images" to start a new batch.

If you made a mistake before compressing, "Reset" clears your selection so you can start over.

Worked Example: Compressing a Phone Photo

Here is an illustrative case. You upload a JPEG named team-photo.jpg that is 2,400 KB, and you leave the quality on Auto.

Suppose the results panel shows Original 2,400 KB, Compressed 600 KB and Saved 75%. The saving is calculated as 100 minus the compressed size as a percentage of the original: 600 divided by 2,400 is 25%, so 100 minus 25 gives 75%.

What does that mean for you? A 600 KB file is a quarter of the original, so a page that carries four such photos goes from about 9.6 MB of images to about 2.4 MB. Open the preview, zoom in on faces and text, and if the detail still looks clean, download it. If you see blotchy skin or fuzzy edges, rerun the original with the slider moved toward Max Quality.

How Do You Read and Act on the Results?

Each compressed image shows three numbers: the original size in KB, the compressed size in KB and the percentage saved. Use them together with a visual check of the preview.

As a common rule of thumb, many performance guides suggest keeping ordinary content images in the low hundreds of KB and treating anything above 1 MB on a web page as a candidate for further work. These are guidelines, not hard rules. A full-width hero photo can reasonably be larger than a small blog thumbnail.

If the tool reports that an image is already compressed, it means the new version would not have been smaller than your original, so no download is offered for that file. Your original is already about as small as this tool can make it at that setting.

Can You Compress an Image to 20KB, 50KB or 200KB?

You can often reach a small target size, but this tool does not have a field for entering an exact number of KB. Instead, you control the Compression Quality slider and look at the Compressed size it reports.

To get close to a target such as 200 KB or 1 MB, use this approach:

• Compress once on Auto and read the Compressed value.
• If it is still too big, reduce the pixel dimensions with the Image Resizer. A photo shrunk from 4000 to 1600 pixels wide drops dramatically in size.
• If the subject is only part of the frame, trim the empty edges with the Image Crop Tool.
• Compress the resized file again and compare the new KB value.

Very small targets like 20 KB work best for simple graphics or small-dimension images. A large detailed photograph squeezed to 20 KB will look poor no matter which tool you use.

Who Is This Image Compressor For?

Anyone who needs smaller image files without installing software can use it. Typical situations include these:

• Website owners and bloggers who want faster pages. Google's Search Central and web.dev guidance both highlight page experience and loading speed, and heavy images are one of the most common causes of slow loading.
• Online store managers who upload dozens of product photos and want consistent, lightweight files.
• Office users who need to shrink pictures before inserting them into a Word document, PowerPoint deck or Excel sheet so the file is easier to email.
• Phone and Mac users who have large camera photos and want a smaller copy for messaging, forms or portals with upload limits.
• Community and chat users who need to stay under an upload limit on platforms such as Discord.
• Developers and designers who prepare assets for a build and want a quick check on how much can be saved.

If you plan to embed a small icon directly in code, you can convert the compressed file with the Image to Base64 tool afterward.

Best Practices, Common Mistakes and Troubleshooting

Compress a copy, keep the original

Lossy compression cannot be reversed. Always keep your untouched original so you can redo the job at a different quality later.

Resize before you compress

The biggest saving usually comes from matching the image's pixel size to the space it fills on the page. An image shown at 800 pixels wide gains little from being uploaded at 4000 pixels wide, even after compression.

Choose the format that fits the image

• Photos generally compress best as JPEG or WebP.
• Logos, screenshots and graphics with flat color and sharp text often suit PNG.
• GIF is best reserved for simple graphics, since it is limited to a small color palette.

Fixing common error messages

• File exceeds 5 MB: reduce its dimensions with the resizer, then upload it again.
• Not a supported format: convert the file to JPEG, PNG, WebP or GIF first. Files from other sources, such as HEIC photos from some phones, need converting before upload.
• Maximum 10 files: process the rest in a second round by choosing "Compress More Images".
• No download offered for one image: it was already compressed, so use the original.

Add descriptive file names and alt text

Compression helps speed, but search engines also read file names and alt text. Name the file something like red-running-shoes.jpg rather than IMG_4821.jpg, and describe the image in your page's alt text.

Limitations to Keep in Mind

Each image must be 5 MB or smaller, and you can process 10 images per batch. The tool reduces file size but does not crop, rotate, rename or change the pixel dimensions of your picture, so combine it with other tools when you need those edits. The percentage saved depends on the image itself: a noisy, detailed photo and a flat-color graphic will compress very differently, and some files will barely shrink at all. Always judge the preview by eye before you publish.

For more ways to prepare pictures for the web, browse the Image Editing & Optimization tools.

Smaller images mean faster pages, easier sharing and fewer upload errors. Add your files above, click "Compress Files", compare the sizes and download the versions that still look right.