Image Compressor
An image compressor reduces the file size of a photo or graphic so it loads faster and takes less space, while keeping it looking sharp. FreeToolsKit's compressor re-encodes your images on a browser canvas at the quality you choose, handling batches in one go. Your files never leave your device — processing happens in your browser, not on a server.
Last updated: October 20, 2026
Drag and drop files here, or click to browse
JPG, PNG, WebP, GIF, BMP — as many as you like
Your files never leave your device — processing happens in your browser.
Key takeaways
- Images are compressed entirely in your browser — files are never uploaded to a server.
- A quality slider from 10 to 95 balances file size against visual quality, with output as the original format, JPEG or WebP.
- Every file shows its before and after sizes and the exact percentage saved.
- Batches can be downloaded one by one or together as a single ZIP file.
How do you compress an image?
- Drag and drop your images onto the panel, or click to browse for them.
- Set the quality slider — around 75–85 is a good balance for photos.
- Choose whether to keep each file's format or convert everything to JPEG or WebP.
- Wait a moment while each image is compressed and its saving is shown.
- Download files individually, or use “Download all as ZIP” for the whole batch.
What is the Image Compressor used for?
- Shrinking website images so pages load faster and rank better.
- Fitting photos under an email or form upload size limit.
- Reducing the storage a photo library takes on a phone or laptop.
- Preparing product images for an online shop where every kilobyte slows the page.
- Making images small enough to post on forums with strict size caps.
Frequently asked questions
Are my images uploaded to your server?
No. Compression happens on a canvas inside your browser, on your own device. Your files are never uploaded, stored or seen by anyone — you can even disconnect from the internet after the page loads.
Which quality setting should I use?
For photographs, 75–85 usually cuts the size dramatically with no visible difference. Drop lower for thumbnails, and stay nearer 90+ for images you plan to print or edit further.
Will compressing change the image dimensions?
No — only the file size changes. The width and height in pixels stay exactly the same. If you need different dimensions, use the Image Resizer tool instead.
Why did a PNG get bigger when I converted it to JPEG?
Simple graphics with few colours compress best as PNG. Photographic content compresses best as JPEG or WebP. If a conversion grows the file, keep the original format for that image.
What happens to transparent backgrounds?
JPEG does not support transparency, so transparent areas become white when converting to JPEG. Keep PNG or choose WebP if your image needs transparency preserved.
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