Free Online Image Compressor
Reduce image file size while balancing visual quality. Compress images directly in your browser without installing software.
Drop an image here
or click to choose • JPG, PNG, WebP, BMP or GIF • up to 25 MB
Choose an image to begin.
Output size depends on image dimensions, format and quality. PNG may be larger than the original. Animated GIFs are processed as a still frame.
What is image compression?
Image compression is the process of reducing an image's file size so it takes up less storage space and can be easier to share or use online. It can be particularly useful for website owners, bloggers, students, designers and anyone who regularly works with digital images.
A smaller image can help reduce the amount of data a webpage needs to load. However, the result depends on the image dimensions, format, compression method and quality settings. The goal is to find a practical balance between file size and visual appearance.
How to compress an image with PixNexa
- Choose an image from your device or drag it into the upload area.
- Select an output format such as WebP, JPG or PNG.
- Adjust the quality slider according to your needs.
- Optionally enter maximum width and height values.
- Click Process image and wait for the preview.
- Compare the original and processed image, then download the result.
You can experiment with different quality settings to find a result that looks good while using less storage space.
How does image quality affect file size?
For formats such as JPG and WebP, reducing the quality setting can often produce a smaller file. However, very low quality may introduce visible artifacts, blurred details or changes around sharp edges.
Higher quality settings generally retain more visual detail but may produce larger files. The best setting depends on the type of image and how it will be used. Photographs may tolerate more compression than images containing small text, logos or fine line drawings.
PNG uses a different compression approach, so the quality slider may not affect PNG output in the same way it affects JPG or WebP.
JPG vs PNG vs WebP: Which format should you choose?
JPG
JPG is commonly used for photographs and everyday images. It supports lossy compression, which means file size can be reduced by adjusting quality. JPG does not support transparency.
PNG
PNG is useful for graphics, screenshots, logos and images that need transparent backgrounds. Its output may be larger than a compressed JPG or WebP file, especially for photographs.
WebP
WebP supports lossy and lossless compression as well as transparency. It can be a useful choice for website images when smaller file sizes are important. Always consider compatibility with the platforms and software where you plan to use the image.
Tips for reducing image file size
- Resize oversized images: Use dimensions appropriate for their display size rather than keeping unnecessarily large images.
- Choose a suitable format: WebP or JPG may work well for photographs, while PNG can be useful for transparent graphics.
- Adjust quality gradually: Compare the preview at different settings instead of immediately choosing the lowest quality.
- Check fine details: Look at text, edges and important image areas before downloading.
- Keep an original copy: Save your original image if you may need to edit or export it again later.
Compress images for websites
Large image files can contribute to slower page loading, particularly on mobile connections. Preparing images close to their intended display dimensions and choosing an appropriate format can help reduce unnecessary data transfer.
For website photographs, WebP can be worth considering. For logos and graphics requiring transparency, PNG may be more suitable. Always check the final appearance and test the image on the website where it will be used.
Private browser-based image processing
PixNexa uses browser features such as Canvas to process images locally on your device. The converter, compressor and resizer are designed not to upload selected images to a PixNexa processing server. Normal website hosting and analytics requests may still take place. Read our Privacy Policy for more information.
Frequently asked questions
1. Is PixNexa Image Compressor free?
Yes. You can use the PixNexa Image Compressor online without creating an account or installing desktop software.
2. Which image formats can I upload?
The tool accepts common image types including JPG, PNG, WebP, BMP and GIF, with a maximum upload size of 25 MB. Browser support may vary for some image types.
3. Which formats can I download?
You can choose WebP, JPG or PNG as the output format.
4. Does compressing an image reduce its quality?
It can. Lossy formats such as JPG and WebP may lose some image detail as compression increases. You can adjust the quality setting and compare the preview before downloading.
5. Why is my compressed PNG file larger?
PNG uses a different compression method from JPG and lossy WebP. Some photographs may produce larger PNG files, so choosing another format may give you a smaller result.
6. Can I compress an image without changing its dimensions?
Yes. Leave the maximum width and height fields empty to keep the original dimensions. You can adjust the quality and output format instead.
7. Are animated GIFs preserved?
No. Animated GIF uploads are processed as a still frame. The tool does not preserve the original animation.
8. Can I use compressed images on my website?
Yes. You can download the processed image and use it on your website, subject to any rights or permissions associated with the original image. Check its visual quality and dimensions before publishing.
Explore more free image tools
PixNexa offers additional browser-based tools for everyday image tasks:
- Image Converter: Change an image between WebP, JPG and PNG formats.
- Image Resizer: Adjust maximum image width and height.
- Background Remover: Create transparent-background images.
Learn more about PixNexa or contact us if you have questions or suggestions.