Free Online Compressors
Shrink images and PDFs to a smaller size while keeping quality — all processed locally for privacy.
Image Compressor
Compress JPG, PNG and WebP images in your browser.
Compress PDF
Reduce PDF file size in your browser.
Image Resizer
Resize images to exact dimensions, keeping quality.
PNG to WebP Converter
Convert PNG images to smaller WebP.
Free Online Compressors that respect your privacy
Large images and PDFs slow down websites, fill inboxes and hit upload limits. Our free compressors reduce file size right in your browser using the Canvas API and pdf-lib, so nothing is uploaded. Adjust the quality, see the savings instantly and download the smaller file — perfect for the web, email and sharing.
Every tool runs in your browser — nothing is uploaded.
Frequently asked questions
Will compression reduce quality?
You control the quality level and can preview the result before downloading.
Is there a file size limit?
Only your device's memory — there are no artificial limits because nothing is uploaded.
Explore more collections
Looking for something specific? Browse all Crystal Toolkit tools or view tools by category.