Luna Watermark

Luna Watermark is a browser-based photo watermark studio for small shops and creators who repeatedly add their brand to a set of photos. Choose one or several images, add your own text or a logo, preview the result, then drag the mark and adjust its size and opacity. One set of settings applies proportionally across the batch; check each photo before export.

Photos and logos are processed on your device and are not uploaded. Export JPEG or PNG copies at the original pixel dimensions, download a ZIP, or use sharing where your browser supports it. The interface is available in English and Traditional Chinese.

Preview without payment details. First month free for exporting, then US$1.99/month plus applicable taxes. A payment method is required; the subscription automatically renews until cancelled. Cancel before the trial ends to avoid the first charge.

Supports JPEG, PNG and still WebP. HEIC/HEIF depends on browser support. Up to 40 photos per batch, 50 MB per file; mobile has a 16 MP safety limit and desktop 40 MP. Oversized images are rejected, not silently resized. JPEG is recompressed and EXIF/GPS, HDR and original color profiles are not retained. Keep your original files. This listing is for the web edition.