Image Compressor
Compress JPG, PNG and WebP images by up to 80% — free, no upload, runs entirely in your browser.
Drop images here
JPG, PNG, WebP — multiple files supported · click to browse
How to use
- 1
Drop one or more JPG, PNG or WebP images into the upload area.
- 2
Adjust the Quality slider — 80% is the sweet spot for most images (great quality, significant size reduction).
- 3
Optionally set a maximum dimension to also resize large images (1920px for web, 1280px for email).
- 4
Click Compress All. Download images one by one or grab them all in a ZIP file.
Free Image Compressor — Reduce JPG, PNG & WebP Size Online
Compress JPG, PNG and WebP images by up to 80% without visible quality loss. Batch compress multiple images, resize dimensions, and download individually or as ZIP. Free, no upload, no account.
Skycally's Image Compressor reduces the file size of JPG, PNG and WebP images using the browser-image-compression library running entirely in your browser via WebAssembly. No file is ever uploaded to a server — all processing happens locally on your device. You can compress a single image or batch-process an entire folder at once, with each image showing a before/after size comparison and the exact percentage saved.
The Quality slider gives you full control over the compression level. At 80% quality (the default and recommended setting), most photographs are reduced by 50–70% with virtually no visible difference to the human eye. Lowering the slider to 60% or below targets maximum file size reduction, useful for thumbnails, email attachments, and social media uploads where bandwidth matters more than pixel-perfect quality. The optional Max Dimension setting resizes oversized images — ideal for web uploads where a 6000×4000px camera photo needs to become a 1920px web image.
Compressing images before uploading them to your website is one of the highest-impact SEO improvements you can make. Google PageSpeed Insights scores heavily penalise large uncompressed images, and research consistently shows that faster page load times improve both search rankings and conversion rates. E-commerce sellers, bloggers, web developers and social media managers all benefit from keeping image files as small as possible without sacrificing visual quality.
Frequently Asked Questions
How much can image file size be reduced?
At 80% quality, most JPG photographs can be reduced by 50–70% with virtually no visible quality difference. PNG files (which are lossless) compress less — typically 10–30%. WebP images are already efficient but can be further optimised by 10–40%.
Is my image uploaded to a server?
No. Compression runs entirely in your browser using the browser-image-compression library and WebAssembly. Your images never leave your device and are never transmitted anywhere.
What is the best quality setting?
80% is the recommended starting point for most images. It provides a significant size reduction (typically 50–60%) with no perceptible quality loss for standard viewing. For thumbnails and social media previews, 60–70% works well. For archival or print purposes, use 90%+.
Can I compress PNG files?
Yes. PNG uses lossless compression by nature, so size reduction for PNGs is smaller than for JPGs — typically 10–30%. For maximum PNG compression, consider converting to WebP using our Image Converter tool.
What does the Max Dimension setting do?
It resizes the image so that neither the width nor the height exceeds the specified pixel count. For example, setting 1920px will resize a 4000×3000px photo to 1920×1440px while preserving the aspect ratio. Images smaller than the limit are not resized.
How many images can I compress at once?
There is no hard limit. For best performance, we recommend batches of 20–30 images at a time on most devices. Very large batches (50+ images) may slow down older devices since all processing happens in the browser's memory.
Why should I compress images for my website?
Smaller images load faster, improving Google PageSpeed scores, reducing bounce rates, and lowering bandwidth costs. Google uses page speed as a ranking factor, and uncompressed images are the most common cause of poor PageSpeed scores.
What formats are supported?
JPG/JPEG, PNG and WebP are fully supported. GIF files can be uploaded but only the first frame is compressed (animation is not preserved). AVIF and TIFF are not currently supported.
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