What Is an Image Compressor?
An Image Compressor is a tool that reduces the file size of a picture so it loads faster, uses less storage and fits inside upload limits. It does this by re-encoding the image with a more efficient setting, usually by lowering the quality slightly in a way most eyes cannot notice, or by shrinking the pixel dimensions when the original is larger than it needs to be.
This Image Compressor works with JPG, PNG and WebP files. Each picture is decoded in your browser, drawn onto an HTML canvas at the size you choose, and saved again at the quality you pick. JPEG and WebP are lossy formats, so the quality slider directly controls the trade-off between size and detail. PNG is lossless, so its size depends mostly on the pixel dimensions, which is why switching a large PNG photo to JPEG or WebP usually saves the most space.
Because the work happens on your own device, the Image Compressor never sends your pictures anywhere. That makes it a sensible choice for personal photos, screenshots with private details and client work. As a side effect, re-encoding through the canvas drops embedded metadata such as camera model and GPS location.
How to Use the Image Compressor
- Drag your images onto the drop area, or click it to choose files from your device. You can add up to 20 images at a time.
- Set the quality slider. Values between 70 and 80 percent are a good starting point for photographs.
- Optionally enter a maximum width in pixels. Images wider than this are scaled down proportionally, and smaller images are left alone.
- Pick an output format. Choose Same as original to keep each file type, or switch to JPEG or WebP for the smallest results.
- Compare the before and after size shown for every image. Move the slider and the results update automatically.
- Click Download beside a single image, or use Download all to save every compressed file.
Key Features of Our Image Compressor
- Compresses JPG, PNG and WebP images in one pass
- Batch processing of up to 20 images at once
- Adjustable quality from 10 to 100 percent with live recompression
- Optional maximum width to resize oversized photos
- Convert to JPEG or WebP while compressing
- Before and after file sizes with percentage saved
- Keeps the original when a file is already as small as it can be
- 100 percent client-side: no uploads, no account, no watermark
Benefits of Using an Online Image Compressor
Smaller images make web pages load faster, which helps visitors and search rankings. Pictures are often the heaviest part of a page, so trimming them is one of the quickest ways to improve loading speed, especially for people on mobile data.
Compression also solves practical problems. Email services and online forms often limit attachment sizes, cloud storage fills up quickly with phone photos, and many application portals reject files above a few megabytes. A compressed image fits where the original would not.
Since the Image Compressor runs entirely in the browser, you get these benefits without handing your pictures to a third-party server.
Your privacy comes first. The Image Compressor runs entirely in your web browser. Nothing you enter is sent to our servers, which keeps your data private and makes results appear instantly. See our Privacy Policy for details.
Common Use Cases for the Image Compressor
- Optimizing blog and product photos before uploading them to a website
- Reducing phone pictures so they fit email attachment limits
- Meeting file size limits on job, visa or school application forms
- Saving storage space on cloud drives and backups
- Preparing images for newsletters and social media posts
- Shrinking screenshots for documentation and support tickets
- Removing hidden location and camera data before sharing a photo
- Creating lightweight WebP versions for faster websites
Tips for Getting the Best Results
- Start at 75 percent quality and lower it step by step until you can see a difference, then go back up one notch.
- For photographs, JPEG or WebP gives much smaller files than PNG. Keep PNG for logos, icons and images with sharp text or transparency.
- Resize first when the image is far larger than needed. A 4000 pixel wide photo shown at 800 pixels wastes most of its data.
- Compress from the original file, not from an already compressed copy, to avoid stacking quality loss.
- Zoom into faces, text and gradients when checking quality, because banding and blur show up there first.
- Keep your original files. Lossy compression cannot be undone.
Image Compressor FAQ
Is my image uploaded to a server?
No. The Image Compressor decodes and re-encodes each picture inside your browser using the canvas API. Your files are never sent to MamaTool or any other server, and nothing is stored once you close the page.
Will compression reduce my image quality?
JPEG and WebP compression is lossy, so some detail is discarded. At 70 to 85 percent quality the change is usually hard to notice while the file becomes much smaller. PNG output stays lossless.
Why did my PNG barely get smaller?
PNG is already lossless and the quality slider does not apply to it. To save more, reduce the maximum width or choose JPEG or WebP as the output format, keeping in mind that JPEG does not support transparency.
What happens to transparency?
PNG and WebP keep transparent areas. If you convert to JPEG, transparent pixels are filled with white because JPEG cannot store transparency.
Does it remove EXIF data and GPS location?
Yes. Redrawing the image on a canvas does not carry over embedded metadata such as camera details or GPS coordinates. Modern browsers still apply the photo's rotation, so it appears the right way up.
Is there a limit on file size or count?
You can process up to 20 images at a time, each up to 25 MB. Very large pictures with more than about 100 megapixels may exceed what a browser can handle and will show an error.