This online image compression tool batch compresses JPG, PNG, and WebP images. It is useful for website images, product photos, blog images, social media assets, content publishing, and large images that need to fit upload limits. Upload images, choose a compression mode, output format, image quality, and maximum side length, then download one image or export all compressed images as a ZIP file.
All image compression runs locally in your browser. Files are not uploaded to a server, which is helpful for private screenshots, work documents, unpublished product images, contracts, and other sensitive images.
How To Compress Images Online
- Click the upload area and choose one or more JPG, PNG, or WebP images.
- Choose a compression mode. The default fast mode works well for everyday use.
- Choose an output format. If you have no specific requirement, use auto mode.
- Adjust image quality. Higher quality keeps more detail but usually creates a larger file.
- Choose a maximum side length. Resizing large images often reduces file size more than changing quality alone.
- Click the compress button and wait for results.
- Check each image's original size, compressed size, and saved percentage.
- Download one image or download all compressed images as a ZIP file.
Choosing A Compression Mode
- Fast compression: best for most images, with quick processing for website images, article images, and normal photos.
- High quality: better for product photos, portfolio images, covers, and images where clarity matters more.
- Smallest file: prioritizes file size for strict upload limits or pages that need faster loading.
If you are not sure, start with fast compression. If the result is still too large, reduce the maximum side length or choose the smallest file mode.
How Image Quality Affects File Size
Image quality controls how much visual detail is kept in the compressed file. Lower quality usually creates a smaller file, but fine details, textures, and text edges may become less sharp.
- Around 90%: clearer output for product images, photos, and portfolio images.
- 75% to 85%: a balanced range for most web images and content images.
- 60% to 70%: smaller files for thumbnails, previews, and strict size limits.
Lowering quality does not guarantee a smaller file. If the original image is already highly compressed, re-encoding it can make it larger. This tool can keep the original automatically when the compressed file is larger.
Choosing Maximum Image Size
File size depends heavily on pixel dimensions. Many phone photos are wider than 3000px or 4000px, but most websites, blog posts, and upload forms do not need the original dimensions.
- 1600px: good for article images, mobile-first images, and common uploads.
- 1920px: good for web hero images and common HD display.
- 2560px: useful when you want to keep more detail.
- 3200px: better for high-resolution images, but files will be larger.
- Keep original size: only change format and quality without resizing width or height.
If compression does not reduce file size much, try 1920px or 1600px first.
Choosing An Output Format
- Auto: a good default that balances clarity, file size, and processing speed.
- Keep original format: useful when a platform requires the same image format.
- JPG: good for photos and product images without transparency, with broad compatibility.
- PNG: good for transparent images, icons, screenshots, and sharp text edges, but files can be larger.
- WebP: good for web images and batch compression. It often balances visual quality and file size well, and it supports transparency.
For website images, WebP is often a good choice. If a platform does not accept WebP, choose JPG or keep the original format.
Why A Compressed Image May Not Be Smaller
Compression depends on the image content, original format, previous compression, pixel dimensions, and selected output format. Some images may not shrink much when:
- The original image has already been compressed by another tool.
- The image is a PNG screenshot, icon, or text-heavy graphic that already fits its format well.
- The pixel dimensions stay the same and only quality is changed.
- PNG output is selected, because PNG preserves transparency and sharp edges and may stay larger.
When this happens, try reducing the maximum side length, using auto or WebP output, or choosing the smallest file mode.
How This Image Compressor Works
The tool reads each image in your browser, resizes it proportionally according to the maximum side length, then generates a new file using the selected output format and image quality. For auto mode and WebP output, it uses a local WebP-focused encoding path when helpful, aiming to balance clarity and smaller file size. Everything happens in the browser.
The tool also compares the original file size with the compressed result. If the compressed file becomes larger and the option to keep the original is enabled, the result keeps the original file instead of giving you a bigger output.
Privacy And Safety
Image reading, previewing, resizing, compression, result comparison, ZIP packaging, and downloads all happen locally in your browser. Images are not uploaded to a server and are not stored in the cloud. Temporary browser data is released when the page is closed.