Numvion

Image Compressor & Converter

Compress and convert images (PNG, JPG, WebP) directly in your browser. No upload, no server. Reduce file size with a quality slider.

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Your images never leave your browser. Everything runs locally.

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Drag & drop an image here

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Accepted: PNG, JPG, JPEG, WebP

Our image compressor and converter processes your images entirely inside your browser using the HTML5 Canvas API — your files are never uploaded to any server, never transmitted over the internet, and never stored anywhere. This makes it the most privacy-respecting image tool available: what you upload stays with you. The tool supports three major web image formats: WebP (Google's modern format offering the best compression), JPEG (universal compatibility, ideal for photos) and PNG (lossless transparency support). The quality slider lets you fine-tune the output from 10% (smallest file) to 100% (maximum quality), with a live before/after size comparison showing the exact byte reduction in real time.

What is WebP and why should you use it?

WebP is a modern image format developed by Google and released in 2010. It achieves 25–35% smaller file sizes than JPEG at equivalent visual quality, and 26% smaller than PNG for lossless images, while supporting both transparency (like PNG) and animation (like GIF). All major browsers — Chrome, Firefox, Safari (since v14), Edge — support WebP. Converting your website images to WebP is one of the single most impactful steps you can take to improve your Core Web Vitals score (specifically Largest Contentful Paint) and therefore your Google Search ranking. Every 1-second reduction in page load time improves conversion rates by an average of 7% according to Cloudflare research. Use our URL Slug Generator to also optimise your image file names for SEO.

Why image optimisation matters for SEO and performance

Images are typically the largest assets on any web page — often accounting for 50–70% of total page weight. Google's PageSpeed Insights explicitly penalises pages with unoptimised images, and since Core Web Vitals became an official ranking factor in 2021, image size directly influences search position. Our QR Code Generator pairs perfectly with this tool for print-ready digital assets.

الأسئلة الشائعة

Does this image compressor upload my photos to a server?
No — your images never leave your device. All compression and conversion is performed using the HTML5 Canvas API entirely in your browser. This makes it safe for personal, medical, legal, or confidential images.
What is the difference between WebP, JPG and PNG?
JPG: lossy compression, best for photographs, no transparency. PNG: lossless, supports transparency, best for logos/screenshots. WebP: Google's modern format — 25-35% smaller than JPG at equal quality, supports transparency AND animation. WebP is the best choice for most web images.
What quality setting should I use?
For web use: 75-85% is the sweet spot — visually indistinguishable from the original at 40-60% smaller file size. For print: 90-100% to preserve fine details. For social media thumbnails: 65-75% is sufficient. PNG ignores the quality slider (lossless).
Why does image size matter for website performance?
Images typically account for 50-70% of a web page's total weight. Unoptimised images slow page load times, which Google penalises via its Core Web Vitals ranking factors (particularly Largest Contentful Paint). Studies show every 1-second delay reduces conversions by ~7%.
What image formats are supported for upload?
You can upload PNG, JPG/JPEG, and WebP images. Output formats available are WebP (recommended for best compression), JPG (best for photos), and PNG (best for images requiring lossless quality or transparency). GIF and TIFF are not currently supported.

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