Add up to 30 images (PNG, JPG, WebP, AVIF, HEIC, GIF or BMP, up to 50 MB each) and the optimizer shrinks each one to a web size (2560 pixels on the longest side by default), compresses it, removes its metadata, and saves it as AVIF, WebP, JPG or PNG. On Auto it keeps whichever of WebP, AVIF and the original format came out smallest, and if nothing got smaller you get the original back. Everything runs in your browser.
Free online image optimizer
Large photos straight from a camera or phone slow pages down. This image optimizer does the usual web preparation in one step: it scales images down to a sensible size, compresses them with a modern encoder, picks a format, and strips EXIF data.
How to optimize images
- Add your images, or drop a whole batch.
- Choose a size: Web (longest side 2560 px), Mobile (1280 px), Original (no resize) or Custom (320 to 4096 px). Images are never enlarged.
- Choose a format, or leave it on Auto, and set the quality (default 80).
- Download the results one by one or as a ZIP.
Why optimize images?
Images are often the heaviest part of a web page. Smaller files mean faster loading, especially on phones and slow connections, and a better Largest Contentful Paint (LCP) score, one of Google's Core Web Vitals. They also cost less bandwidth for you and your visitors.
What the optimizer does
On Auto it encodes each image as WebP and AVIF and also re-compresses it in its original format, then keeps the smallest file. JPG is skipped for images with transparency, so transparent areas survive. You can also force one format for the whole batch.
The quality slider runs from 10 to 100. AVIF is encoded with libavif, WebP with libwebp, JPG with MozJPEG, and PNG output is compressed losslessly with oxipng.
Every new file is saved without metadata, which takes out camera details and GPS location along with the bytes they use. If an image can't be made smaller, you get the original back, and for JPG, PNG, WebP and AVIF originals the metadata is removed without re-encoding the pixels.
Image format comparison
| Format | File size | Transparency | Browser support | Best for |
|---|---|---|---|---|
| AVIF | Usually smallest | Yes | Current browsers | Photos on the web |
| WebP | Small | Yes | All current browsers | General web use |
| JPG | Medium | No | Universal | Photos, older systems |
| PNG | Large for photos | Yes | Universal | Graphics, logos, screenshots |
Who uses it
Web developers run images through it before adding them to a site. Bloggers and content creators shrink photos for posts, store owners prepare product images, and marketers trim images for email campaigns, where every kilobyte counts.
Technical specifications
Input formats are PNG, JPG, WebP, AVIF, HEIC, GIF (first frame) and BMP, and output formats are AVIF, WebP, JPG and PNG. Each batch takes up to 30 files of up to 50 MB and 64 megapixels each. Quality goes from 10 to 100. Processing happens in your browser, and files are never uploaded or stored on a server.
Frequently Asked Questions
What is image optimization?
It means making an image file as small as possible while it still looks right where it is used. That usually involves resizing to the displayed size, compressing, choosing an efficient format and removing metadata.
Which image format should I choose?
Leave it on Auto and the optimizer compares WebP, AVIF and the original format for each image and keeps the smallest. If you need one format for everything, WebP is a safe choice for websites, AVIF is usually smaller still, and JPG works everywhere.
How does image optimization help SEO?
Smaller images load faster, which improves Largest Contentful Paint and overall page speed. Page experience is one of the signals Google uses, and faster pages also keep visitors from leaving.
Is this image optimizer really free?
Yes. There are no fees, no watermarks and no sign-up. Each batch holds up to 30 images, and you can run as many batches as you need.
Will image quality be affected?
AVIF, WebP and JPG output are lossy, so some detail is traded for size. At the default quality of 80 the difference is hard to see in most photos, and you can raise it if needed. PNG output is lossless.
What's the maximum file size I can optimize?
Each image can be up to 50 MB and 64 megapixels.
Can I optimize multiple images at once?
Yes. Add up to 30 images and they are all optimized with the same settings.
Related Tools
- PNG Compressor for PNG files only
- JPG Compressor for JPG files only
- WebP Compressor for WebP files only
- AVIF Compressor for AVIF files only
- Batch Image Resizer to resize to exact dimensions
- Metadata Cleaner to remove EXIF data without re-encoding