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Guides
Short, practical guides on editing images privately — how in-browser tools work, how they compare to server-based tools, and how to keep your files safe. Every Rastera tool is free and processes your images on your device, never uploading them.
How Rastera works — in-browser image processing explained Rastera runs every image operation locally in your web browser, so your files are never uploaded to a server. This page explains, in technical detail, how that works and how you can verify it for yourself. Online vs local image tools: which is safer? Most 'online' image tools upload your file to a server to process it; local, in-browser tools process it on your own device and never upload it. For privacy, local tools are the safer choice. Here is a clear comparison so you can decide. Is it safe to edit images online? Editing images online is safe when the tool processes your file in your browser and never uploads it; it is riskier when the tool sends your file to a server. The single most important thing to check is whether your image leaves your device.