Need to stitch two screenshots side by side for a comparison? Or maybe stack a bunch of product photos into one image for a listing? Combining images sounds like it should be easy, but most built-in photo apps on Windows and Mac don’t actually have a “merge” button. You end up opening Photoshop or Paint and manually resizing canvases.
I spent a week testing every free online image combiner I could find. Some were painfully slow, others slapped watermarks on the output, and a few just crashed on large files. Here are the 7 that actually worked well.
If you’re working with images a lot, you might also want to check out our picks for the best free photo editors and best free photo collage makers – they cover broader editing tasks beyond just combining.
Quick Comparison Table
| Tool | Max Images | Layout Options | Watermark | Signup Required | Max File Size |
|---|---|---|---|---|---|
| PhotoJoiner | 8 | Horizontal, Vertical, Grid | No | No | ~10 MB each |
| Pinetools | 2 | Horizontal, Vertical | No | No | No stated limit |
| IMGonline | 2 | Horizontal, Vertical | No | No | ~30 MB each |
| Canva | Unlimited | Grid, Freeform, Templates | No (free tier) | Yes | 25 MB each |
| Kapwing | Unlimited | Freeform canvas | No (under 5 min video / images) | Yes | 250 MB |
| Adobe Express | Unlimited | Templates, Freeform | No | Yes | 40 MB each |
| Fotor | Unlimited | Grid, Collage, Freeform | No | Yes (limited free) | 20 MB each |
1. PhotoJoiner – Best for Quick Side-by-Side
PhotoJoiner does one thing and does it fast. You upload your images, pick horizontal or vertical layout, drag to reorder, and download. That’s it. No account, no watermark, no 15-step wizard.
I used it to merge 4 screenshots into a horizontal strip for a blog post. The whole process took about 30 seconds. You can adjust spacing between images, change the background color of the gaps, and resize individual images within the layout.
What I liked
- No signup required – just open and go
- Clean interface without ads covering half the screen
- Adjustable margins and background color between images
- Supports up to 8 images per merge
What could be better
- Limited to 8 images maximum
- No way to set exact output dimensions in pixels
- Can’t rotate individual images before merging
Price: Free, no account needed. Premium version ($6.95/month) adds more templates.
2. Pinetools – Simplest Two-Image Combiner
Pinetools has a dead-simple “Merge Images” page. Upload image one, upload image two, pick horizontal or vertical, hit merge. The output downloads instantly as PNG or JPG.
Honestly, this is the tool I reach for when I need to put two images next to each other and nothing else. There’s no drag-and-drop, no canvas editor, no fuss. It processed a pair of 4000×3000 photos in under 5 seconds without compressing them.
What I liked
- Zero friction – no account, no ads in the way
- Handles large resolution images without downscaling
- Option to align images to top, center, or bottom edge
- Choose output format (PNG or JPG)
What could be better
- Only handles 2 images at a time
- No preview before download
- UI looks dated
Price: Completely free. Ad-supported but ads don’t interfere with the tool.
3. IMGonline – Best for Specific Output Control
IMGonline looks like it was built in 2005, and it probably was. But the image combiner on this site gives you control that most modern tools skip: exact output quality percentage, format selection (JPG/PNG/BMP/GIF/TIFF), and the option to auto-resize the smaller image to match the larger one.
I tested it with two images of different sizes – one 1920×1080, the other 800×600 – and it automatically scaled the smaller one to match the height of the larger when combining horizontally. No other free tool handled mismatched sizes this cleanly without asking me to manually resize first.
What I liked
- Auto-resizes mismatched images to align properly
- Five output format options including TIFF
- JPG quality slider from 1-100
- No account, no watermark, no file size popups
What could be better
- Only combines 2 images
- The interface is genuinely ugly
- Server-side processing means slow on peak hours
Price: Free. No premium tier exists.
4. Canva – Best for Designed Layouts
Canva is obviously overkill for just sticking two images together. But if you need to combine images into a polished layout with consistent spacing, borders, or text overlays, it’s hard to beat on the free tier.
Start a custom-size design, drag your images onto the canvas, and arrange them manually or use a grid template. The snap-to-grid feature makes alignment fast. I created a 4-image comparison grid with labels in about 2 minutes.
The catch: you need an account. And Canva will aggressively try to upsell you to Pro ($12.99/month) with premium templates and stock photos mixed into the free ones. But for the actual combining task, free works fine.
What I liked
- Precise control over placement, sizing, spacing
- Add text labels, arrows, borders on top of combined images
- Templates for common layouts (side-by-side, grid, before/after)
- Download as PNG, JPG, or PDF
What could be better
- Requires a free account
- Slower than single-purpose tools for a basic merge
- Pro upsells are constant
- Can’t export at full original resolution on free tier for some templates
Price: Free with account. Canva Pro is $12.99/month or $119.99/year.
5. Kapwing – Best for Mixed Media (Images + Video)
Kapwing started as a video editor, but its canvas works for images too. Upload multiple images, arrange them on a blank canvas, resize and position each one, then export as PNG or JPG.
Where Kapwing stands out: if you need to combine images AND add a video clip or GIF into the same layout, it handles that natively. I used it to create a tutorial graphic that had a screenshot on the left and a short screen recording on the right, exported as a single MP4.
For pure image combining, it’s more steps than PhotoJoiner. But the flexibility is there if you need it. If you need to resize images before combining them, Kapwing handles that in the same workspace.
What I liked
- Mix images, videos, and GIFs on one canvas
- Layer-based editor with precise positioning
- Smart guides for alignment
- Export in multiple formats including MP4
What could be better
- Requires signup for downloads
- Free exports limited to 720p
- Interface has a learning curve compared to simple combiners
- Slow with files over 50 MB
Price: Free with watermark-free exports for images under certain limits. Pro is $16/month.
6. Adobe Express – Best for Brand-Consistent Layouts
Adobe Express (formerly Adobe Spark) has image-combining capabilities baked into its collage and freeform design tools. The free tier is surprisingly capable – you get access to thousands of templates, basic editing tools, and watermark-free exports.
I tested it for combining product photos with consistent padding and brand colors. The “resize and reformat” feature let me create the combined image in one aspect ratio and instantly reformat it for different platforms (Instagram square, Pinterest vertical, Facebook cover).
If you already use other Adobe products and have a Creative Cloud account, Express is included. Even without that, the standalone free tier covers basic combining.
What I liked
- One-click reformat for different platform sizes
- Brand kit feature (free tier limited to 1)
- Good template library for comparison layouts
- Integrates with Adobe stock
What could be better
- Account required
- Slower loading than dedicated combiner tools
- Some templates locked behind Premium ($9.99/month)
- Output quality can be lower than source on free tier
Price: Free with account. Premium is $9.99/month or included with Creative Cloud ($54.99/month).
7. Fotor – Best Collage-Style Combiner
Fotor’s collage maker is the standout feature for combining images. It offers preset grid layouts (2 images, 4 images, 6 images, and up) with adjustable spacing, rounded corners, and background colors. Pick a layout, drop your images in, tweak the spacing, done.
The difference between Fotor and a pure combiner like PhotoJoiner: Fotor gives you grids. Not just horizontal or vertical stacking, but actual magazine-style layouts where one image takes up two-thirds of the space and two smaller images sit on the right. For portfolios or social media posts, this matters. For more collage ideas, see our best free photo collage makers roundup.
What I liked
- Wide variety of grid templates (50+ free options)
- Adjustable corner rounding and border width
- Built-in photo filters to apply to individual images before merging
- One-click social media sizing
What could be better
- Free tier limits exports to standard quality
- Requires account for downloads
- Some grid layouts are Pro-only (marked with a crown icon)
- Ads on the free tier can be distracting
Price: Free with limitations. Fotor Pro is $8.99/month or $39.99/year.
Step-by-Step: How to Combine Images in PhotoJoiner
Here’s the quickest method I’ve found for merging images online, using PhotoJoiner as the example:
- Go to photojoiner.com and click “Create Collage” or “Merge Images”
- Click “Add Images” and select your files (up to 8)
- Choose your layout: horizontal strip, vertical stack, or grid
- Drag images to reorder them
- Adjust spacing using the margin slider (0px for seamless joins)
- Set background color if you want colored gaps between images
- Click “Save” and choose JPG or PNG format
The whole process takes under a minute for most use cases.
When to Use Which Tool
Here’s my take after testing all of them:
- Just sticking 2 images together? Pinetools. Open, upload, done. No thinking required.
- 3-8 images in a row or column? PhotoJoiner. Fast, no signup.
- Different-sized images that need auto-alignment? IMGonline. Handles size mismatches better than anything else.
- Need text labels or decorative layouts? Canva. More effort, but polished results.
- Mixing images with video clips? Kapwing. Only tool here that handles both.
- Brand-consistent layouts across platforms? Adobe Express. The reformat feature saves time.
- Magazine-style grids for social media? Fotor. Best grid template variety.
Tips for Better Results When Combining Images
Match the resolution before merging. If one image is 4000px wide and another is 400px wide, the small one will look blurry when stretched to match. Use an image resizer to get them closer in resolution first.
Use PNG for screenshots and diagrams. JPG compression creates artifacts around text and sharp edges. If your combined image has text, UI elements, or line art, export as PNG.
Set margins to zero for seamless panoramas. If you’re stitching panorama sections or document scans, remove all spacing between images for a clean join.
Check the output file size. Combining multiple high-res photos can produce files over 20 MB. If you need to share via email or upload to a platform with size limits, consider compressing the output afterward.
FAQ
Can I combine images online without signing up?
Yes. PhotoJoiner, Pinetools, and IMGonline all let you combine images without creating an account. You upload your files, merge them, and download the result immediately. Canva, Kapwing, Adobe Express, and Fotor require a free account before you can download.
What is the best free tool to merge two images side by side?
For merging exactly two images, Pinetools is the fastest option. It has no signup, no ads blocking the interface, and handles high-resolution files without downscaling. If your two images are different sizes and you want automatic alignment, IMGonline is the better choice.
How do I combine images without losing quality?
Use PNG as the output format instead of JPG – PNG is lossless and won’t add compression artifacts. If you must use JPG, set the quality slider to 95-100%. IMGonline gives you a specific quality percentage slider. Also avoid tools that automatically downscale your images during the merge process.
Is there a way to combine images into a PDF instead?
Most image combiners export as JPG or PNG. If you need a PDF output, you can first combine your images using any tool from this list, then convert the result to PDF. Or use a dedicated tool – check our guide on how to convert images to PDF for free which lets you merge multiple images directly into a PDF document.
Can I combine more than 10 images at once?
Canva, Kapwing, Adobe Express, and Fotor all support unlimited images on their canvas editors. PhotoJoiner caps at 8 images. For dedicated merge tools like Pinetools and IMGonline, the limit is 2 images per operation, but you can merge the output with additional images in multiple passes.