Images
A lighter image, without the upload.
How to compress an image in your browser, choose useful settings, and compare the result before replacing your original.
By KeepSimp 4 min read
A photo can look lovely and still be larger than the place you want to put it. The useful question is not how small you can make it. It is how much detail you need for its next job: a portfolio, a message, or a website. Here is a practical way to find that balance with the KeepSimp image compressor.
Start with the original, and keep it.
Work from the best version you have. Repeatedly opening a lossy file and saving it again can introduce further changes. Keep a separate original so you can make a different export later.
The KeepSimp image compressor accepts JPEG, PNG, WebP, AVIF, HEIC, GIF, BMP, TIFF, SVG and JPEG XL files up to 50 MB and 50 million pixels. Animated files use their first frame. It decodes and encodes the image on your device with WebAssembly codecs running in your browser. The tool does not send the selected file to a server.
Set the size for where it will live.
A smaller pixel count is often the clearest way to reduce an image's weight. For example, a picture intended for a small card usually does not need the same dimensions as a full-screen photograph. Check the space where the image will appear before choosing a width.
Open Image compressor and choose, drop or paste a file. Under Size, pick a percentage, a long edge such as 1920 pixels, or exact custom dimensions; proportions stay locked unless you unlock them. You can also crop to a shape such as 1:1 or 16:9 and rotate the image. Outputs can be up to 16,383 pixels on a side. Enlarging cannot recreate detail that was never in the source.
Adjust quality, then look closely.
Smart compression tries several quality levels and keeps the smallest file that still measures close to your original, using a structural similarity score. Images with text and flat colour are judged by their weakest areas, so edges stay clean. Choose High quality for more detail, Smallest for lighter files, Custom to set quality yourself, or Target size to fit a limit such as 200 KB.
Drag the comparison slider across the image, and zoom to 100% or 200% to inspect detail. Look for blurred lettering, halos around edges, or banding in smooth areas. If the change is distracting, choose High quality or a different format. Compare the measured size; if re-encoding cannot beat your original, KeepSimp tells you and offers the original instead.
Check the result before replacing anything.
The tool reports the output format, dimensions, file size, saving and how much detail it measured as kept. Open the downloaded file in the app or page where you plan to use it. Confirm that it displays correctly before removing a larger copy from your workflow.
Compressed files leave out metadata such as camera details and location, and colours are converted to sRGB. Animation is not preserved. JPEG replaces transparency with a background colour, white by default. Keep the original, and choose PNG, WebP or AVIF when transparency matters. For archival or print work, use a workflow that explicitly preserves the properties you need.
Further reading
Topics: compress image · image compressor · reduce image size · compress JPEG · compress PNG · compress photo online free · no upload
A little less theory. A little more doing.
Try it on your own terms, with a free browser tool.
Try the tool