1. Add your images
Drop in PNG, JPG, or WebP files. You can process up to 20 at once without creating an account.
Free · no login · no upload
Free image compressor with target file size
Compress images to 300 KB—or any size you choose. Resize and convert PNG, JPG, and WebP files privately in your browser.
Target a specific KB sizeBatch up to 20 imagesFiles stay on your device
Drop images here
PNG, JPG, or WebP · up to 20 files · 50 MB each
KB
How it works
Reduce image size in three steps
The tool balances image dimensions and encoding quality so you can hit a practical file-size target without guessing.
2. Choose the result
Use a one-click web preset, or choose the format, maximum dimension, and target size yourself.
3. Download locally
Review the real output size and dimensions, then download one image or the full batch.
Recommended settings
How small should an image be?
There is no universal perfect file size. Start from where the image will be displayed, then keep enough detail for text and important edges to remain readable.
For website images, WebP at an 800px long edge with a 300 KB target is a strong default.
| Use case | Format | Long edge | Target size |
|---|---|---|---|
| Portrait images and blog graphics | WebP | 800–1200px | 200–400 KB |
| Social media posts | WebP | 800–1200px | 150–300 KB |
| Website photography | WebP or JPG | 1200–1600px | 200–500 KB |
| Small thumbnails | WebP | 600px | 50–150 KB |
Private by design
Your images never leave your device
The page uses your browser’s built-in image canvas to decode, resize, and encode each file. There is no image-upload endpoint, cloud storage step, or account requirement.
- No server upload or permanent storage
- No login, watermark, or usage credits
- Results disappear when you close or refresh the page
Image compressor FAQ
Common compression questions
Are my images uploaded to a server?
No. Image decoding, resizing, and compression happen locally in your browser. Your files are not sent to Image25 or a third-party image service.
What target file size should I choose?
For most website images, 150–300 KB is a practical target. Images with small text may need 300–500 KB, while thumbnails can often be kept below 150 KB. Always check the downloaded image at its intended display size.
Which format gives the smallest file?
WebP is the best default for most website graphics because it supports transparency and usually produces smaller files than PNG. JPG remains useful for photos. Keep PNG when you specifically need lossless output or maximum compatibility with an existing workflow.
How does target-size compression work?
The compressor tests multiple quality levels and keeps the clearest result that fits your KB target. If quality alone is not enough, it gradually reduces image dimensions while preserving the original aspect ratio.
Can I compress several images at once?
Yes. You can add up to 20 PNG, JPG, or WebP files. They are processed one at a time on your device to reduce browser memory use, then you can download each result or download all.
Why can a compressed image sometimes be larger?
A very small or already optimized source can become larger when it is re-encoded, especially when converting to a lossless format. The results show the before-and-after size so you can keep the original when compression offers no benefit.
Need a visual before you compress it?
Turn your prompt into an image, then use this compressor to prepare a lightweight WebP for your website.
Generate an image