How do I overlay two images online?

Upload a main image (output size) and a secondary image. Adjust position, scale, rotation, flip, or transparency—the preview updates automatically. Download PNG when the composite looks right.

What is the difference between overlay and merge?

Overlay composites the secondary image on top of the main canvas at a chosen position. /merge-images stitches two photos edge-to-edge vertically or horizontally.

How do I position the secondary image?

Use center horizontally or vertically, drag position sliders, or click the output preview to place the overlay when center options are off.

Does transparency work on PNG overlays?

Yes. Enable set transparency and raise the percentage to fade the secondary layer. PNG alpha on the secondary upload is respected when drawing.

Which image sets the output size?

The main image canvas dimensions define the exported width and height.

Can I combine two pics into one image?

Yes. This tool lets you combine two pics by overlaying a secondary image on a main image canvas, then exporting one PNG.

Are files uploaded to a server?

No. Compositing runs locally in Canvas.

What is the maximum file size?

15 MB per upload with a longest edge of 8192 px.

Main image

The output image shares the size with this image.

Drop or click to upload the main image

Secondary image

This image can be placed anywhere on the output image.

Drop or click to upload the secondary image

Overlay options

Center the image horizontally

Ignores the selected horizontal position.

Center the image vertically

Ignores the selected vertical position.

Position X (px)

Position Y (px)

Rotate image

Resize image

Flip image horizontally

Flip image vertically

Set transparency

Output image

Click the preview to place the secondary image when center options are off.

Upload main and secondary images—the preview updates automatically.

Overlay images online

Overlay pictures online by placing one photo on another. Use this picture on picture editor with position, scale, rotation, and transparency controls.

What is image overlay?

Image overlay places one picture on top of another while keeping the main canvas size. This page works as an image overlayer and picture on picture editor: upload a main image and a secondary image, position the layer with centering or click placement, optionally scale, rotate, flip, or fade it, and download a single PNG. The main image defines output dimensions, and the secondary composites above it with alpha blending when transparency is enabled.

Image overlay features

Overlay two images and composite a secondary photo on a main image in the browser.

Main and secondary uploads: Output matches main image size; secondary layers on top.
Position controls: Center axes, X/Y sliders, or click the preview to place.
Scale and rotate: Optional resize percent and clockwise or counterclockwise rotation.
Flip and transparency: Mirror the overlay horizontally or vertically; fade with transparency.
Live preview: Composite refreshes when any option changes.
PNG download: Save as overlay-images.png.

How to overlay images

Steps for overlay pictures online.

Upload main and secondary images: Main sets canvas size; secondary is the layer you place.
Position the overlay: Center both axes, fine-tune with sliders, or click the output preview.
Tune scale, rotation, or transparency: Resize for watermarks, rotate stickers, or fade logos.
Download PNG: Export the blended result for social posts or mockups.

Tips for overlay compositing

Better blended results when you overlay two images.

Use PNG for logos: Transparent secondary files avoid white boxes around marks.
Scale before rotating: Set resize first so rotation pivots around the intended size.
Click to rough-in position: Use the output preview click, then nudge with X/Y sliders.
Uncheck center to free-place: Horizontal and vertical center locks override click and sliders.
Compare with merge: Use /merge-images when you need a tall strip or side-by-side panel.
Export PNG: Preserve transparency on the final composite when needed.

When to overlay images

Typical uses for photo compositing.

Watermarks: Place a logo on photos with transparency and scale.
Stickers and badges: Drop PNG graphics with alpha onto a base shot.
Meme templates: Position a cutout over a background image.
Before labels: Add a small inset image without merging panels.
Mockups: Composite UI screenshots on device frames.
Quick blends: Combine two layers without desktop Photoshop.

Why use this overlay tool

Benefits of browser-based compositing.

Layered not stitched: Secondary sits on the main canvas—unlike side-by-side merge.
Private: Images stay on your device.
Free: Unlimited previews and downloads.
Flexible placement: Center, sliders, and click-to-place on the preview.
No install: Works in modern browsers with Canvas 2D.
Honest scope: One secondary layer per export—not multi-layer PSD editing.

Technical details

How image overlay works here.

Canvas size: Output width and height match the main image upload.
Transforms: Scale, rotate around overlay center, horizontal and vertical flip.
Alpha: globalAlpha from transparency slider; PNG alpha preserved on draw.
Position: Top-left placement with optional center overrides per axis.
Input limits: 15 MB per file; longest edge 8192 px.
Browser support: Chromium, Firefox, Safari with Canvas 2D.

Frequently Asked Questions

Have questions? We have answers.

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