Image Compressor & Converter
Compress and convert PNG, JPG, WebP, and AVIF locally. Preserve the original pixel dimensions in quality mode, or keep every result under a strict KB/MB limit. Your images are never uploaded.
Click to choose images or drag them here
PNG, JPG, WebP and AVIF · Up to 20 images
All images are processed locally on your device and are never uploaded to any server.
How to use
- 1Choose imagesClick the upload area or drop PNG, JPG, WebP, or AVIF images. You can add several at once.
- 2Adjust settingsChoose quality mode to keep the original pixel dimensions, or enter a strict KB/MB limit for each image, then select the output format.
- 3Download resultsStart processing, then download files individually or save every result in one ZIP.
About image compression and conversion
This free image tool runs entirely in your browser. Make large PNG and JPG files easier to share and upload, or convert between PNG, JPG, WebP, and AVIF. Modern formats such as WebP and AVIF can greatly reduce file size while preserving visual quality, making them ideal for websites and mobile apps.
Unlike tools that send files to a server, this one uses WebAssembly to process everything on your device. That protects your privacy and removes the wait for uploads and downloads.
Quality mode and strict target size
Compress by quality always preserves the source pixel dimensions and changes file size only through encoding quality. Strict target size treats the entered KB/MB value as a hard per-image limit: JPG, WebP, and AVIF first keep a high quality at the original dimensions and downscale proportionally only if the lowest quality is still too large. PNG has no adjustable lossy quality level, so an oversized PNG may need proportional downscaling directly.
Lossy compression and lossless formats
JPG, WebP, and AVIF use lossy compression, removing details that are less noticeable to make smaller files. Lower quality settings produce smaller files with more visible loss. PNG is lossless and works well for exact pixels, transparency, screenshots, and icons with text. As a rule of thumb, use JPG, WebP, or AVIF for photos, and PNG or WebP for screenshots, icons, line art, and transparency.
Common uses
- Compress website images to improve loading speed, SEO, and user experience.
- Use a strict target size to keep each photo within an email or form's KB/MB limit.
- Convert to WebP or AVIF for even smaller files at similar visual quality.
- Turn transparent PNGs into smaller WebP files while keeping transparency.
Need different pixel dimensions first? Use the image resizer. If you are unsure which format to choose, read WebP vs AVIF and the practical image compression guide.
Frequently asked questions
QWill my images be uploaded to a server?
No. Compression and conversion happen entirely in your browser. Your files never leave your device, and we cannot access them.
QWhich image formats are supported?
You can compress and convert between PNG, JPG (JPEG), WebP, and AVIF.
QWill compression reduce image quality?
In Compress by quality mode, the slider controls the quality and file-size tradeoff while pixel dimensions always stay unchanged. In Strict target size mode, JPG, WebP, and AVIF first keep a high quality at the original dimensions and only downscale proportionally if the lowest quality is still over the limit.
QCan I strictly compress each image to a specified KB or MB limit?
Yes. Choose Strict target size and enter a per-image limit from 10 KB to 20 MB. JPG, WebP, and AVIF first keep a high quality at the original pixel dimensions and only downscale proportionally if the lowest quality is still too large. PNG is lossless and has no adjustable lossy quality level, so it may need proportional downscaling directly. Every successful result stays at or below the target.
QWhich is better, WebP or AVIF?
AVIF is often smaller at the same quality, but it encodes more slowly and has less support in older browsers. WebP is faster and more compatible. Choose AVIF for the smallest files or WebP for broad compatibility.
QWhat happens when a transparent PNG is converted to JPG?
JPG has no transparency, so transparent areas are filled with white. Choose WebP, AVIF, or PNG if you need to preserve transparency.
QCan I process several images at once?
Yes. Add multiple images and start processing; when they are ready, download every result together as a ZIP.
QDo I need to sign up or pay?
No. The tool is free, requires no account, and adds no watermark.