Reduce upload weight
Prepare images for blogs, docs, and landing pages with appropriate width and quality settings.
Image Optimizer
브라우저 내부 처리
Compress, resize, and convert JPEG, PNG, and WEBP files in the browser.
Image optimization workflow
Before uploading an image you have to decide how far you can compress before the quality shows. Adjusting dimensions, quality and output format while comparing results lets you find that point by eye. Files are processed in the browser rather than uploaded, so unreleased or internal images are fine to drop in.
Compare output formats
Choose WEBP, JPEG, or PNG based on whether the source is a photo, screenshot, or transparent graphic.
Local conversion
Resizing and conversion happen in the browser; the original file is not uploaded by this tool.
Errors you will hit
Transparent areas turn black
JPEG has no alpha channel. Converting a transparent PNG to JPEG fills those pixels with black or white. Keep WebP or PNG when transparency matters.
Quality degrades with each pass
JPEG and WebP are lossy. Recompressing an already compressed file stacks the loss. Always start from the original.
The size barely drops
The file is probably already optimized, or the dimensions are unchanged. Reducing the pixel width to the actual display size usually beats lowering the quality value.
Things to check
Transparency and format
JPEG does not preserve transparency. Use PNG or WEBP when logos or icons need transparent backgrounds.
Metadata may be removed
Canvas-based conversion may not preserve EXIF metadata. Keep the original when photo metadata matters.
WebP is not always smaller
WebP beats JPEG on photographs, but a flat-colour logo or screenshot can be smaller as PNG. If transparency is required, JPEG is out. Exporting all three and comparing sizes is the reliable check.
Metadata and orientation
Phone photos carry EXIF location and orientation. Stripping EXIF during compression can leave a portrait photo sideways; keeping it publishes the location. For public images, stripping is the right default.
Lost quality does not come back
JPEG and WebP are lossy, so each save discards information. Recompressing an already-compressed file degrades it in steps. Keep the original and export fresh from it each time.
More: step-by-step usage and worked examples
How to use it
- Select the source image.
- Set target width, quality, and output format.
- Compare the expected size and visible quality, then download the optimized file.
- Place important images in the real page to recheck sharpness and layout impact.
Real input and output
A photo converted to WebP
Input
photo.jpg 2.4 MB / 4032×3024Output
photo.webp 310 KB / 1600×1200
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