How to use
- 1Drag and drop images or click to select them (multiple files supported).
- 2Set the quality and choose to keep the format or convert to WebP or JPEG.
- 3Optionally set a maximum width to downscale oversized photos.
- 4Compare before/after sizes, then download each image or all at once.
Private by design: nothing is uploaded
Compression runs entirely in your browser using the Canvas API. Your images never leave your device, so it is safe for client work, ID scans or unreleased product photos, and there are no upload waits or file-count limits beyond what your device can handle.
Which quality setting to use
For photos, quality 75–85 is the sweet spot: typically 50–80% smaller with no visible difference at normal viewing size. Below 60, artifacts start to show around edges and text. The biggest wins usually come from two things combined: resizing (a 4000-pixel camera photo displayed at 1200 pixels wide is mostly wasted bytes) and switching to WebP, which is typically 25–35% smaller than JPEG at the same visual quality.
Image size targets for a fast website
Aim for hero images under 200 KB, content images under 100 KB and thumbnails under 30 KB. Images are often the largest element on the page and directly drive LCP, a Core Web Vital. After compressing, serve images at their display size, add width and height attributes to prevent layout shift (CLS), and lazy-load images below the fold with loading="lazy" — but never the LCP image.
Frequently asked questions
Is compression lossless?
Re-encoding to JPEG, WebP or AVIF at a quality below 100 is lossy, but at 75–85 the difference is practically invisible. PNG kept as PNG is lossless, which is why PNG photos shrink most when converted to WebP or JPEG.
Why did my PNG get bigger?
Re-encoding an already-optimized PNG through the browser can add bytes. For photos, convert to WebP or JPEG; for logos and graphics with transparency, WebP usually beats PNG.
Is there a file size or number limit?
No hard limit. Since processing happens on your device, very large or numerous images just take a little longer.
Is metadata (EXIF) removed?
Yes. Re-encoding through the canvas drops EXIF data such as GPS location and camera details, which also saves a few kilobytes.
Not happy with the results?
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