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Convert and compress images instantly in your browser. JPG to PNG, WebP, AVIF, PDF and more — 100% free, private, no uploads. Your files never leave your device.

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| Website | fileflux.io | opalstack.com |
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| Company | Startup from the United Kingdom · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


FileFlux is a free, browser-based image converter and compressor. All processing happens locally on your device — no files are ever uploaded to any server, keeping your images completely private. Convert between JPG, PNG, WebP, GIF and more instantly. No sign-up, no installs, no watermarks. Just...
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As answered by people managing FileFlux.io and Opalstack.
FileFlux.io's answer
FileFlux processes everything directly in your browser using client-side technology. Your images are never uploaded to any server, making it one of the few truly private image tools available online — completely free with no limits.
FileFlux.io's answer
Most image tools send your files to remote servers, raising privacy concerns. FileFlux never uploads your data anywhere. It's faster, safer, and works offline once loaded. No account, no watermarks, no file size restrictions — just instant results.
FileFlux.io's answer
Web developers, designers, bloggers, and everyday users who need a fast, private way to convert or compress images without installing software or trusting their files to third-party servers.
FileFlux.io's answer
FileFlux was built out of frustration with existing image tools that require server uploads, impose file size limits, or hide basic features behind paywalls. The goal was simple — build a tool that's genuinely free, fast, and respects user privacy completely.
FileFlux.io's answer
HTML5, CSS3, JavaScript, Canvas API, and WebAssembly — all browser-native technologies that enable powerful client-side image processing without any backend infrastructure.
FileFlux.io's answer
Web developers optimising images for production UI/UX designers preparing assets for handoff Bloggers and content creators compressing photos before publishing Small business owners managing website images independently
Share your experience with using FileFlux.io and Opalstack. For example, how are they different and which one is better?
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Compress, resize, convert images and PDFs in your browser. 100% free, no signup, no upload. Files never leave your device.
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Free tools to compress and convert images, PDFs and video — most run entirely in your browser, so your files never leave your device. No watermark, no sign-up required.
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100% private, in-browser JPEG XL converter. No sign-up, no limits, no watermark.
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