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Karui is an image compression, format conversion, and PDF compression tool for Mac and Windows, positioned around “Compress, Convert & Optimize.” Its main selling point is 100% offline operation: files are processed locally on your device and are not uploaded to the cloud. This makes it suitable for designers, web developers, and users who need to handle client assets. The website also offers a free online compression tool, so you can quickly try it before installing the desktop app.
In terms of functionality, Karui covers many common image-optimization workflows: compression, HEIC/HEIF/AVIF to JPEG conversion, PDF compression, batch processing, resizing, and cropping. It supports 7+ input formats, including JPEG, PNG, WebP, HEIC, HEIF, AVIF, and PDF, with particular emphasis on compatibility with iPhone HEIC photos and the newer AVIF format. PDF compression offers Smart mode and Render mode: the former optimizes embedded images inside the PDF, while the latter re-renders pages as compressed images, which is more geared toward maximum file-size reduction.
The pricing structure is straightforward: the Standard free version can process 20 images per day and includes the full compression engine plus a 7-day Pro trial. Pro costs $29 as a one-time purchase and includes unlimited compression, batch processing, HEIC/AVIF conversion, PDF compression, resizing and cropping, plus 1 year of updates. The available text does not disclose payment methods, refund policy, business licensing, or multi-device licensing details.
The main advantage is local offline processing, which offers privacy benefits and is well suited to NDA-protected client assets. By combining compression, conversion, resizing, cropping, and PDF compression into a single workflow, it can also reduce tool-switching between design handoff and web deployment. The one-time purchase model is also more predictable than a subscription. Its limitations are that the text indicates images are compressed into optimized JPEGs, while other output format options are not clearly described. There is also limited information about collaboration, team management, cloud sharing, and support. The free version’s 20-images-per-day limit is restrictive for heavy users.
Karui is best suited for web developers, designers, e-commerce operators, photo organization workflows, and content teams. Typical use cases include reducing the size of images exported from Figma, batch-compressing product images, converting HEIC to JPEG, and slimming down PDF documents. Access from mainland China cannot be determined from the text alone; however, because its core features run offline, it should have relatively low network dependency after installation. Alternative tools include TinyPNG, Squoosh, ImageOptim, XnConvert, Caesium, iLoveIMG, and others.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on karui.app official site.
karui.app is an Japan Design & Creative provider. TG4G tracks its product information, with monthly pricing from $29.00, an overall rating of 8.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach karui.app directly.