画像へのロゴ追加

What this tool does

Add Logo to Image overlays a brand logo, badge, watermark, or signature on top of a photo and exports a flattened copy. Position, size, opacity, margin, and rotation are tuned with live preview, so you can compare layouts in seconds before downloading.

Why use a logo overlay

Branding photos before publishing protects authorship, reinforces identity on social posts and product shots, and keeps marketing assets consistent. A clean PNG logo with transparency takes a couple of seconds per image — far faster than reopening a desktop editor for each photo.

Step-by-step

1. Upload a photo (JPG, PNG, WebP, GIF, or BMP up to 20 MB). 2. Upload a transparent PNG or WebP logo up to 5 MB. 3. Pick a corner from the 3×3 position grid or a quick preset, then fine-tune Size, Opacity, and Margin. 4. Choose JPG, PNG, or WebP and download.

Tuning the look

Use 60–80% opacity for photos so the subject stays primary. Drop Size to 8–12% for subtle signatures and lift to 25–35% for prominent branding on banners. Increase Margin when the logo touches important edges of the composition.

Privacy and related tools

Files never leave your browser tab. For more options, try Watermark Maker, Rotate Image, or the Image Converter.

Interface walkthrough

Upload Image — drop a photo or click to browse. The card shows the resolution and file size so you can confirm the right asset was loaded.

Upload Logo — pick a transparent PNG or WebP. A checkerboard preview makes alpha edges visible before compositing.

Position grid — nine anchors map to corners, mid-edges, and center. The Quick Presets row mirrors the four corners and Center for one-click placement.

Size / Opacity / Margin — Size is a percent of photo width, Opacity controls the logo's alpha, and Margin is the pixel distance from the chosen edge.

Advanced Settings — open this for Rotation if you need a tilted stamp or diagonal watermark.

Output — JPG flattens transparency to white and respects Quality, PNG keeps transparency lossless, WebP supports both with the smallest files.

What does Add Logo to Image do?

It places a logo, badge, or watermark on top of any photo or graphic with full control over position, size, opacity, rotation, and margin. The original image stays intact while a flattened copy is exported.

Which logo file works best?

PNG with a transparent background gives the cleanest result on any photo. WebP with alpha works too. Avoid JPG logos — they carry a solid white box around the artwork.

Where do my files go?

Nowhere. All compositing runs inside your browser via canvas. Both the photo and the logo stay on your device — no upload, no server.

How do I keep transparency in the output?

Pick PNG or WebP as the export format. JPG cannot store alpha, so any transparent pixels will flatten to the image background.

Why is my logo too small or too large?

Logo size is a percentage of the photo width. Increase Size if the logo looks tiny on a 4K photo, or lower it for a subtle signature watermark.

Can I rotate the logo?

Open Advanced Settings and use the Rotation slider. -180° to 180° in 1° steps for diagonal stamps and tilted badges.