Here are the most popular questions.
You can import images of any size. Exported photos are optimized for the web: up to 1280 pixels wide for landscape and 720 pixels wide for portrait images. Images are never upscaled. When a logo is applied, the output is a PNG file.
Your images never leave your computer. Stamp.Ninja processes everything directly in your browser — no photo or logo is ever sent to any server.
Stamp.Ninja offers a free plan (up to 3 photos per batch, 4 corner positions, M size). The Pro plan at €9/month unlocks unlimited photos, 9 positions, and 4 sizes (S, M, L, XL). No Stamp.Ninja branding is added to your photos, on either plan.
Subscribe from the app with a secure Lemon Squeezy checkout. You will then receive a magic link by email that unlocks Pro on your browser for 30 days and renews automatically while your subscription is active — no account or password needed. You can request a new link or manage and cancel your subscription anytime from the app.
Any image your browser can open (JPG, PNG, WebP, GIF…) works for your photos. Your logo can be a PNG with transparency or an SVG. If you process several photos, they are downloaded together as a single ZIP file.
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