Image Compressor
Compress JPG, PNG and WebP images in bulk, set a quality or a target file size, and download them separately or as one ZIP.
Drag & drop your images here
or click to browse · you can also paste with Ctrl+V
How to compress images here
- Add your images by dragging them onto the box, choosing them with the button, or pasting a copied image with Ctrl+V. You can add up to 100 files at a time, each up to 60 MB.
- Choose the quality with the slider. It starts at 75, and a range of roughly 70 to 85 is a sensible balance for photos.
- Optionally tick “Limit file size to” and enter a maximum in KB or MB, or pick a smaller “Longest side” to reduce the pixel dimensions.
- Press Compress, watch the progress popup, then download each result or all of them in one ZIP file.
By default each file keeps its original format. You can also switch the output to JPG, PNG, WebP or AVIF, and the results list shows the before and after sizes so you can judge the saving.
What compression does to an image
A picture stores a colour value for every pixel, and compression finds ways to store the same picture in fewer bytes. Lossless methods repack the data without changing a single pixel. Lossy methods throw away detail your eye is unlikely to notice, such as tiny colour differences in a textured area, and that is where the big savings come from.
Quality settings by format
| Format | Type | What the quality setting does here |
|---|---|---|
| JPG | Lossy | Controls how much detail is discarded; lower means smaller files and visible blocks at extremes |
| WebP | Lossy | Works like JPG quality, usually giving a smaller file for the same look |
| AVIF | Lossy | Same slider, available only if your browser can create AVIF |
| PNG | Lossless format | Reduces colour precision below high quality settings so the file packs smaller |
The results depend on the picture. Detailed photos and noisy scans shrink less than flat graphics, and text in screenshots looks softer at low JPG quality, so use PNG or a high setting for those.
Compressing to a specific file size
Upload forms often set a limit such as 100 KB, 200 KB or 1 MB. With a size limit ticked, the tool lowers the quality step by step to find the highest setting that fits. If the quality alone is not enough, it shrinks the pixel dimensions by about 15% at a time, up to several attempts, and shows the final dimensions. For an extremely small target on a large photo, resize first with the image resizer to keep the result sharp.
When you keep the original format and a file cannot be made smaller, the original is kept and marked as already optimised, so you never get a larger file back.
Dimensions matter more than quality
A photo taken with a phone can be 4,000 pixels wide, far more than a screen needs. Halving the width and height cuts the pixel count to a quarter, which usually saves more space than any quality setting. Use the Longest side option to cap the size (options run from 3840 px down to 800 px), then adjust quality on top.
Web performance and privacy
Smaller images load faster, which helps visitors and can improve Core Web Vitals scores such as Largest Contentful Paint. For website images, converting to WebP with the PNG to WebP converter is often the next step. All processing happens in your browser, so your images are not uploaded to a server. Re-encoding through the browser typically drops embedded metadata such as camera details and GPS location, and animated images are saved as a single still frame. Very large images beyond browser limits are scaled down and flagged in the results.
Frequently Asked Questions (FAQs)
Add your images and keep the quality slider between 70 and 85. At that range the file size drops sharply while the difference is hard to notice. Use the preview sizes in the results list to compare before you download.
Yes. Turn on the target size option, enter the maximum size in KB or MB and Momentix lowers the quality step by step (and shrinks the pixels slightly if it has to) to get under that limit.
JPG and WebP use lossy compression that you control with the quality slider. PNG is lossless, so we reduce its colour detail to shrink it. WebP usually gives the smallest file for the same look.
Yes. Drop up to 100 images in at a time, each up to 60 MB, compress them together and download every file separately or all at once in a ZIP archive.
No. Everything happens inside your browser, so your photos never leave your device. There is no upload, no account and nothing is stored on our servers.
No. If a file cannot be made smaller in its current format, Momentix keeps the original bytes and tells you it was already optimised.
Add the JPG, lower the quality slider to around 75 and press Compress. The result list shows the new size next to the original before you download.
PNG has less room to shrink than a photo saved as JPG or WebP, especially for photographic content. If the file does not need transparency, convert it to JPG or WebP with the image converter first, then compress that result.
Aim for under 200 KB for content images and no wider than about 1920 px. Use the longest-side option and a quality of 70–85% to get there.
Usually yes. The image is redrawn and saved again by your browser, which typically leaves out embedded metadata such as camera model, date and GPS location. Keep your original if you need that information.
PNG is a lossless format, so savings depend on how much colour detail can be reduced. Photos saved as PNG are large by nature. Converting a photo to JPG or WebP usually saves far more than compressing the PNG.