Free Image Combiner
Our image combiner lets you merge 2, 3 or 4 photos into one — side by side, stacked vertically or in a 2×2 grid. Upload your photos, pick a layout and download the combined image in seconds. No signup, no watermark, works on any device.
Upload at least 2 images to preview your combined photo
All processing happens in your browser — your photos are never uploaded to any server.
How to Combine Images Online
Four steps from upload to download — takes under a minute on any device, no software needed.
Upload Your Photos
Click any of the four photo slots to upload an image from your device. You need at least 2 photos — up to 4 are supported. JPG, PNG and WebP all work.
Choose Layout & Options
Pick side by side, stacked vertically or a 2×2 grid. Set the gap size between photos, choose a gap color and select your output format and quality.
Click Combine Images
Hit the Combine Images button. The tool processes everything in your browser instantly and shows you a live preview of the merged photo result.
Side by Side
Merges photos horizontally — great for before/after comparisons, product shots and travel collages.
Stacked Vertical
Places images on top of each other — perfect for long infographics, step guides and Instagram carousels.
2×2 Grid
Arranges up to 4 photos in a square grid — ideal for mood boards, product galleries and family memory collages.
Everything This Image Combiner Offers
Built for people who need clean results fast — no Photoshop skills, no software, no fuss.
Merge 2, 3 or 4 Photos
Combine 2, 3 or 4 images in one shot. Every slot is optional — use only the ones you need.
3 Layout Options
Side by side, vertical stack or 2×2 grid. Each layout scales images automatically to match proportions.
Custom Gap Color
Set the border color between merged photos to white, black, transparent or any custom hex color you want.
Gap Size Control
Slide from 0px for a seamless merge to 40px for clearly separated photos with breathing room.
JPG & PNG Output
Download as JPG for smaller file size or PNG for lossless quality and transparent gap support.
Quality & Size Control
Choose output quality from 60% to 100% and set max output width from 600px to original resolution.
100% Private
Every image is processed entirely in your browser. Nothing is uploaded to any server at any point.
Works on All Devices
iPhone, Android, Windows, Mac — if it has a browser it runs this tool. No app download required.
Instant Preview
See the combined result before downloading. If something doesn't look right, adjust and combine again.
Daraz & Online Sellers
Merge product photos side by side to show multiple angles in one listing image.
Before & After Photos
Place two images side by side for fitness transformations, renovation reveals and skincare results.
Instagram & Social Media
Create grid layouts and side-by-side posts without opening Photoshop or Canva.
Documents & Reports
Combine multiple chart screenshots or images into one image before pasting into Word or PDF.
Students & Teachers
Merge diagrams, screenshots or reference images into a single file for assignments and notes.
Memory Collages
Put 4 family or trip photos into one grid image to share in WhatsApp groups in one send.
How to Merge Images Online — The Complete Guide
Whether you want to put two photos side by side or build a four-image grid, our free image combiner handles it in seconds with no loss of quality.
Why Use an Online Image Combiner Instead of Photoshop?
Photoshop costs money, takes time to learn and is overkill for simply putting two photos next to each other. Most people who need to merge images just want a quick result — a combined photo they can share on WhatsApp, post to Instagram or attach to an email. Our free online image combiner does exactly that in under a minute.
There is also a privacy argument. When you use our tool, your photos never leave your device. The entire merge operation happens in your browser using the HTML5 Canvas API — the same technology used by professional web-based design tools. No cloud upload, no waiting, no risk.
Side by Side Photo Merge
The horizontal layout is the most popular. It lines your images up left to right, automatically scaling them to the same height so the result looks clean and balanced. This is what you want for:
- Before and after comparisons
- Two product angles in one listing image
- Two people's photos side by side
- Screenshot comparisons for reviews
Set gap to 0 for a seamless stitch or add a white or black gap line between the two photos for a cleaner split look.
Stitch Photos Vertically
The vertical layout stacks images on top of each other, all scaled to the same width. People use this mostly for:
- Long infographics from multiple screenshots
- Stitching chat screenshots on Android or iPhone
- Step-by-step photo guides
- Recipe or tutorial photos in sequence
For chat screenshot stitching, set gap to 0 and choose a white gap color — the joins will be practically invisible.
Merge 4 Photos in a Grid
The 2×2 grid layout puts four photos into a square arrangement. It is the go-to format for:
- Family memory collages for WhatsApp
- Four-angle product grids for Daraz listings
- Mood boards and vision board images
- Four-photo event recaps for Instagram
You can also use just 3 images in grid mode — the fourth slot stays empty and is filled with your chosen gap color.
Merge Photos on iPhone & Android
This tool works directly in your phone browser — no app download, no signup. On iPhone, use Safari or Chrome. On Android, use Chrome.
- Open stackflowtools.com/image-combiner/ in your browser
- Tap a photo slot to pick from your camera roll
- Choose layout, tap Combine Images
- Tap Download to save to your phone
The downloaded image goes straight to your Photos app — ready to share on WhatsApp or Instagram immediately. Learn more about how image editing works in your browser.
More Free Image Tools
Every tool is free, runs in your browser and needs zero signup.
Background Remover
AI removes backgrounds from photos in seconds. Works on portraits, products and objects.
Use Free Tool → 📦Image Compressor
Shrink image file sizes by up to 90% without visible quality loss. Perfect before uploading.
Use Free Tool → 🔍AI Image Upscaler
Enlarge small images up to 4× using AI without blurring or pixelation.
Use Free Tool → 📐Image Cropper
Crop any image to a specific size or aspect ratio. Great for social media thumbnails.
Use Free Tool → 🔃Image Rotation Tool
Rotate images 90°, 180° or 270° and flip horizontally or vertically instantly.
Use Free Tool → 🖥️White Screen Tool
Full-screen white, black or any color display. Great for photography lighting and pixel testing.
Use Free Tool →Frequently Asked Questions
Common questions about our free image combiner tool.
Is this image combiner really free with no watermark?
+Yes — completely free, no watermark on the output image, no signup, no account needed. You get a clean combined image with nothing added to it. StackFlow Tools is funded independently and all tools are permanently free.
How many photos can I merge at once?
+You can merge up to 4 photos at once using our image combiner. Slots 3 and 4 are optional — if you only need to merge 2 photos, just fill the first two slots and leave the rest empty. For the grid layout you can use 2, 3 or 4 images.
What image formats does the combiner support?
+You can upload JPG, PNG and WebP images. The output can be downloaded as either JPG (smaller file size, good for photos) or PNG (lossless quality, supports transparent backgrounds). Mixed formats are fine — you can merge a JPG and a PNG together without any issues.
Will it resize my photos automatically?
+Yes. When you choose the horizontal layout, all images are scaled to the same height while maintaining their original proportions. For vertical layout, all images scale to the same width. For the grid layout, each image is placed in a cell sized to the largest uploaded image, centered within its slot.
Can I use this tool on my iPhone or Android?
+Yes. The tool works in any modern mobile browser — Safari on iPhone, Chrome on Android. You can pick photos directly from your camera roll. The merged image downloads straight to your Photos app. No app download is needed at any point.
Are my photos uploaded to a server?
+No. All image processing happens entirely inside your browser using the HTML5 Canvas API. Your photos are never sent to any server, never stored anywhere online and never seen by anyone. The moment you close the tab they are gone completely.
How do I put two photos side by side on iPhone?
+Open this tool in Safari on your iPhone. Tap Photo 1 slot and select your first photo from your camera roll. Tap Photo 2 and select the second. Make sure layout is set to Side by Side. Tap Combine Images, then Download. The merged photo saves directly to your iPhone Photos app — no app needed.
Can I stitch screenshots together using this tool?
+Yes, and it works really well for this. Upload your screenshots in order, choose the Stacked (Vertical) layout, set gap to 0px and pick a white gap color to match most screenshot backgrounds. The result is a seamless single image from multiple screenshots — useful for sharing long conversations or web pages.
What is the maximum file size per image?
+Each image can be up to 15MB. For most photos from a phone camera this is more than enough. If you have very large RAW or high-resolution files, compress them first using our free Image Compressor tool to bring them under the limit.
Ready to Merge Your Photos?
Scroll up, upload your images and combine them in seconds — free, no signup, no watermark.
⬆️ Go to Image Combiner Tool