Image Optimizer — Compress to WebP & AVIF (Free, In-Browser)
Free image optimizer. Re-encode PNG/JPG images to modern WebP or AVIF with a quality slider and optional resize, in batches — see the size saved per file. Runs in your browser, nothing uploaded.
Image Optimizer — WebP & AVIF
Shrink JPG / PNG / WebP / AVIF to modern formats right in your browser. Nothing is uploaded.
Drop images here, or click to choose
PNG · JPG · WebP · AVIF · GIF · BMP — re-encoded locally, nothing leaves your browser
AVIF encoding needs Chrome or Edge — Safari can't encode it. We'll tell you and skip if your browser can't.
Make your images much smaller
WebP and AVIF are modern image formats that are typically 25–70% smaller than PNG or JPEG at the same visual quality — great for faster websites and smaller uploads. Drop in one image or a whole batch, pick a format and quality, optionally cap the width, and the tool re-encodes everything in your browser and shows exactly how much you saved on each file. Nothing is uploaded; download files individually or all at once as a ZIP.
How to use the Image Optimizer (WebP & AVIF)
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Image Optimizer (WebP & AVIF) above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Image Optimizer (WebP & AVIF).
What’s the difference between WebP and AVIF?
Both are modern formats that beat PNG/JPEG on file size. AVIF usually compresses a bit smaller than WebP but encodes more slowly and isn’t supported for encoding in every browser. WebP is the safe, widely-supported default; try AVIF if your browser supports it and you want the smallest files.
My browser says it can’t make AVIF — why?
AVIF encoding isn’t available in every browser (Safari, for example, can’t encode it). The tool detects this and tells you — just switch the output format to WebP, which works everywhere.
Are my images uploaded?
No. Every image is decoded and re-encoded locally with an in-browser canvas. Your images never leave your device.
Will optimizing lose quality?
These are lossy formats, so lower quality means smaller files. The default (80) is a good balance — visually near-identical but much smaller. Drag the slider up for higher fidelity or down for tiny files, and compare the saved size shown per image.
Can I resize while optimizing?
Yes. Set a maximum width and any larger image is scaled down (keeping its aspect ratio) before encoding, which shrinks the file even further. Leave it off to keep original dimensions.
Community rating
Discussion (0)
No comments yet. Start the discussion.
Keep exploring
Related tools across 7BusyBoss — all free, all instant.