Compress JPG, PNG, WebP, and GIF images right in your browser — batch upload multiple files, adjust quality with a slider, and see before/after size savings instantly. Nothing is ever uploaded to a server.
Drag and drop images here, or click below to browse. JPG, PNG, WebP, and GIF supported.
Images are typically the single largest contributor to a web page's total download size, often outweighing all of a page's HTML, CSS, and JavaScript combined, which makes image compression one of the highest-impact web performance optimizations available. A smaller image downloads faster, especially over slower mobile connections where every kilobyte adds measurable delay, and it reduces bandwidth costs for anyone hosting or serving that image at scale — whether that's a personal blog, an e-commerce product catalog, or an app's user-uploaded photo gallery.
Beyond web performance, compression matters anywhere storage or transfer size is a practical constraint: email attachment limits, messaging app upload caps, cloud storage quotas, or simply wanting a folder of vacation photos to take up less space on a phone. A well-compressed image at a sensible quality setting is visually indistinguishable from the original in the vast majority of everyday viewing contexts, while taking a fraction of the space — which is exactly the tradeoff a quality slider is designed to let you control directly, rather than accepting a single fixed compression level.
JPEG and WebP (in its lossy mode) use lossy compression, meaning some original image information is permanently discarded during encoding in exchange for a substantially smaller file — the encoder is specifically designed to discard the visual information human perception is least sensitive to first (subtle color gradients and high-frequency detail) while preserving the information we notice most (overall shapes, edges, and brightness), which is why a well-chosen lossy quality setting can look nearly identical to the original despite containing meaningfully less data. PNG uses lossless compression instead, meaning the exact original pixel values are always perfectly recoverable — no visual information is ever discarded, which is essential for screenshots, diagrams, and graphics with sharp edges or text, but which also means PNG can't shrink nearly as dramatically as a lossy format for photographic content.
WebP is notable for supporting both modes in a single format — lossy WebP typically produces smaller files than equivalent-quality JPEG, and lossless WebP typically produces smaller files than equivalent PNG, which is why it's become a popular modern choice for web images where browser support allows. Choosing the right format for the content matters as much as choosing the right quality setting: a photograph almost always compresses better as JPEG or WebP, while a screenshot or logo with flat colors and sharp edges almost always compresses better, and looks better, as PNG or lossless WebP.
This tool works by drawing your uploaded image onto an in-memory HTML canvas element, then asking the browser's own built-in image encoder to re-export that canvas as a new file at your chosen quality — the same underlying encoding engine your browser already uses whenever it saves or exports any image, just invoked programmatically rather than through a 'save image' menu. Because this all happens through standard, well-supported browser APIs (Canvas and the File/Blob APIs), no server round-trip or third-party image-processing service is needed at any point in the process.
To keep the page responsive while compressing larger images or batches, the actual encoding work runs inside a Web Worker — a separate background thread the browser provides specifically for computationally heavy tasks — so compressing a large batch of photos doesn't freeze the rest of the page or block you from continuing to interact with the upload area while earlier images finish processing.
Match the format to the content: use JPEG or WebP for photographs and complex, gradient-rich images where some quality loss is imperceptible at normal viewing sizes, and use PNG (or lossless WebP) for screenshots, logos, icons, and anything with sharp edges, flat colors, or transparency, where lossy artifacts would be immediately visible as blockiness around edges or text. Compress images at the resolution they'll actually be displayed at — compressing a 4000-pixel-wide photo down in file size while still keeping it 4000 pixels wide wastes the compression's potential if it will only ever be shown at 800 pixels wide on a page; resizing to the actual display size first, then compressing, produces dramatically better results than compression alone.
Always keep an original, uncompressed (or minimally compressed) master copy of any image you care about, since repeatedly re-compressing an already-lossy JPEG or WebP file (open, edit, re-save, repeat) compounds quality loss with each pass — a problem sometimes called 'generation loss.' Compress from the original source each time you need a new output, rather than compressing an already-compressed file further. Finally, use the before/after preview and the exact savings percentage this tool shows you rather than guessing at a quality number — the right setting genuinely varies by image content, and a value that looks great on one photo might show visible artifacts on another with more fine detail or sharper edges.
Image Compressor reduces file size while keeping images in their original format and dimensions. These related image tools cover other common parts of an image-optimization workflow.