Conversion & Optimization Presets
Configure your target file format, compression algorithm, and dimension scaling.
Uses iterative binary search across JPEG/WebP quantization to guarantee the output file remains strictly under your chosen size limit without pixel distortion.
Drag & Drop Images for Batch Conversion
Supports HEIC, HEIF, WebP, PNG, JPG, and BMP. Unlimited files processed simultaneously in client memory.
Why Client-Side Image Optimization Protects Your Privacy
Most online image converters and compression tools upload your personal photographs, identity documents, and sensitive assets to third-party cloud servers. OverlayCheck processes all transformations locally inside your browser using HTML5 Canvas and WebAssembly.
Government visa portals, state DMV systems, and enterprise hiring platforms reject photos over 200KB or 500KB. Our iterative binary search engine downsamples and quantizes photos until the byte footprint strictly satisfies the requirement.
Apple devices capture photographs in the High Efficiency Image Container (HEIC) format by default. Our dynamic WASM decoder extracts the high-resolution bitmap and repacks it as standard JPEG or WebP without uploading to external APIs.
Your photos never touch a cloud bucket, database, or analytics tracking pipeline. When you close the browser tab, all memory allocated by OffscreenCanvas and TypedArrays is instantly discarded by the browser garbage collector.