Help & FAQ
Answers to the most common questions about imgpact.
Are there any file size or quantity limits?
No. imgpact processes files entirely in your browser, there are no server-side limits. The only practical limit is your device's available RAM. A modern computer handles files of several hundred megabytes without issues.
Do my images get uploaded to a server?
Never. All processing happens locally in your browser using WebAssembly. Your files never leave your device.
Which image formats are supported?
imgpact supports PNG, JPG/JPEG, WebP, GIF, BMP, ICO, AVIF, TIFF, and SVG. Format availability varies by tool.
Why is the first operation slower?
The WebAssembly engine (~2 MB) is loaded on first use and then cached by your browser. Subsequent operations are instant.
How do I convert multiple images at once?
On the converter pages, simply drop or select multiple files. They will all be processed and available for individual download or as a ZIP archive.
Is imgpact free?
Yes, all tools are free. The site is supported by unobtrusive advertisements.
Which browsers are supported?
Any modern browser with WebAssembly support: Chrome 88+, Firefox 89+, Safari 15.2+, and Edge 88+. Internet Explorer is not supported.
Can I use imgpact offline?
After the WASM engine has been cached by your browser, most tools work without an internet connection. A PWA offline mode is on the roadmap.
Why can't I convert images to HEIC format?
HEIC uses the HEVC (H.265) codec, which is patent-encumbered. There is no open-source WebAssembly encoder available, and browsers do not support HEIC as a Canvas output format. imgpact is a fully browser-based tool that cannot rely on server-side licensed codecs. You can convert FROM HEIC to any open format (JPG, PNG, WebP...). To produce HEIC files, use the Photos app on iPhone or Mac, which encodes natively.