Online Image Compressor
Reduce image file sizes for websites, emails, and forms with fast, client-side browser compression and target size optimization.
Drop your image here to compress
Supports JPG, PNG, and WebP up to 25 MB • 100% private in your browser
Zero server upload: Your image never leaves your device
Client-Side In-Browser Image Compression
PrintReady’s Image Compressor executes all image processing directly inside your browser canvas. Your confidential images, scans, and photos never pass through an external server or third-party cloud. Adjust lossy compression quality, convert between JPG and WebP formats, or let our binary search algorithm automatically hit target file boundaries such as 100 KB or 500 KB.
How Browser Compression Works
When you compress a JPEG or WebP file, the browser evaluates visual frequencies and quantizes high-frequency color variations that the human eye barely notices. For PNG graphics, browser canvas utilizes lossless deflate compression; if drastic size reduction is needed for photos originally saved as PNG, converting them to WebP or JPEG achieves immense file savings without visible softness.
Target Size Optimization vs. Quality Sliders
Traditional compressors force users into repetitive guess-and-check slider cycles to meet upload limits. Our Target File Size engine uses an iterative binary search to calculate the optimal quality factor in milliseconds, stopping as soon as the file fits your upload ceiling.
Frequently Asked Questions
No. All compression, format conversion, and blob downloads take place entirely in your web browser memory. No data is sent over the internet.