What is Image Compressor?
An image compressor makes picture files smaller so that they upload faster, load quicker on a website and fit within the size limits of forms and email. Modern phone cameras produce photos of several megabytes, which is far more than most screens need. This tool shrinks JPG, PNG and WebP files while keeping them looking like the original to the human eye. You can compress one picture or a whole batch, choose how much quality to give up, aim for an exact target size in kilobytes, and compare the before and after sizes straight away.
How Does It Work?
Your browser decodes each picture and draws it again at the quality you pick, using a small compression library that runs in a background worker so the page stays responsive. If you set a target size, the library repeats the process with lower quality, and slightly smaller dimensions when necessary, until the file fits. A progress bar shows each image as it is processed. Everything happens inside your browser, so no image is uploaded to a server or stored anywhere. As a bonus, the compressed copy has its camera and location data removed, which also helps protect your privacy.
How to Use It
- Drop your images onto the box, or click it to choose JPG, PNG or WebP files.
- Set the Quality slider. Around 80 is a good balance of size and sharpness.
- Optionally enter a target size in KB, pick a smaller dimension, or switch the output to JPEG or WebP.
- Press Compress and watch the progress bar until every image is done.
- Compare the before and after sizes, then download each file or the whole batch as a ZIP.
Key Features
- Quality slider from 10 to 100 percent
- Optional target size in KB for forms and uploads with strict limits
- Batch mode for up to 25 images, with a single ZIP download
- Side by side before and after previews with exact file sizes
- Resize and convert to JPEG or WebP for even smaller files
- Private by design, with no upload, no sign-up and no watermark
Frequently Asked Questions
Will compressing reduce the quality of my image?
JPEG and WebP compression discards a little detail to save space. At quality 75 to 85 the difference is hard to see on screen. If the result looks too soft, raise the slider and compress again.
Why did my PNG barely change?
PNG is a lossless format, so the quality slider cannot shrink it much. For a big saving, switch the output to JPEG or WebP, or reduce the dimensions. Keep PNG only when you need transparency or perfectly sharp edges.
Why does the tool say my image is already small?
If the compressed copy would not be smaller than the original, the tool keeps your original rather than giving you a bigger file. Try a lower quality, a smaller size or a different output format.
Which file types are supported?
JPG, PNG and WebP are supported. GIF, SVG, HEIC, BMP and similar formats are rejected with a clear message, because they cannot be compressed safely in the same way.
Are my photos uploaded or stored?
No. Every step runs on your own device, and the pictures never leave your browser. Closing or refreshing the page removes them completely.