Not all online image converters are created equal. Many claim to be "free" but upload your files to their servers — a privacy risk for personal photos, client work, or sensitive documents. Here are the 5 best converters that actually keep your files on your device.
Specializes in WebP conversion with support for PNG, JPG, and GIF output. Pure browser-based processing with zero upload. Batch convert up to 50 files, PWA support for offline use, dark mode. Fast and lightweight — no bloat.
Best for: Converting WebP images from the web. Try WebP2PNG.io
Focuses on image compression rather than format conversion. Supports PNG, JPG, WebP, and AVIF input. Before/after slider comparison. Quality slider control. Same browser-based, no-upload approach.
Best for: Reducing image file size for websites and email.
Converts SVG vector graphics to PNG, JPG, or WebP. Unique scale control (1-8x) and background color options. Handles transparent SVGs correctly. Batch 50 files at once.
Best for: Designers working with vector assets.
Well-established tool for PNG and WebP compression. Uses smart lossy compression to dramatically reduce file sizes. Requires file upload to their servers, but has a strong reputation for security. Free tier: 20 images, max 5MB each.
Best for: Maximum compression with server-side optimization.
Google's open-source image optimization tool. Supports nearly every image format with detailed quality controls, resizing, and palette options. Works entirely in the browser. Great for comparing codecs side by side.
Best for: Developers and advanced users who need fine-grained control.
Bottom line: Always prefer browser-based converters. They're faster, more private, and work offline. WebP2PNG.io is your best bet for WebP conversion — free, instant, and completely private.