How to Make a Photo Collage for Free Online (No Login, No App)

A photo collage combines multiple images into a single grid layout — two photos side-by-side for a before/after comparison, four photos in a 2×2 grid for a family event recap, or six photos in a 3×2 layout for an Instagram carousel preview. brevio Photo Collage Maker handles this entirely in your browser: images are processed by the Canvas API, sized with cover-fit rendering to prevent distortion, and exported as a 1200px-wide PNG — all without uploading a single pixel to a server.

When Collages Are Useful

Instagram Carousels and Reels Covers

A 2×2 or 2×3 grid showing four to six moments from an event makes a strong carousel preview. The first image in a carousel is what followers see in the feed — a multi-photo collage creates more visual interest than a single shot and communicates the variety of content inside the carousel.

Before and After Comparisons

The 2×1 layout (two photos side by side) is the standard format for before/after comparisons in fitness, design, renovation, and skincare content. Use consistent framing for both images — same angle, same distance from subject — so the comparison reads clearly.

Memory Boards and Recap Posts

A 3×2 grid (six photos) is well-suited for year-in-review posts, event recaps, and team highlights. It fits six distinct moments at a readable size in a single image — more visual density than a photo essay, less complexity than a photo book.

Presentation Visual Aids

Collages work well as a single slide showing multiple examples, product variants, or data visualizations. A 1200×600px 2×1 collage fits neatly on a 16:9 presentation slide with room for a title above it.

Layout Guide

Image Quality Tips

Use Consistent Orientation

Cover-fit rendering handles mixed orientations — landscape photos and portrait photos can coexist in the same collage without distortion. However, the visual result is cleaner when photos share the same orientation. For 2×2 and 3×2 layouts, all-landscape or all-portrait photos produce more balanced cells.

Match Exposure and Color Temperature

Collages that mix photos from different lighting conditions (outdoor sunlight next to indoor tungsten) look inconsistent. If your photos were taken in different environments, adjust white balance and exposure in a photo editor before combining them. brevio's Photo Editor can match brightness across images before you bring them into the collage maker.

Source Resolution

The output PNG is 1200px wide. For a 3×2 grid, each cell is approximately 392×392px after gaps. If your source images are smaller than 400×400px, they will be upscaled to fill the cell, which can reduce sharpness. For best results, use source images of at least 800×800px.

Background Color

The default gap color is white (#ffffff), which creates a clean separation between cells. The 8px gap appears as a thin white border between photos. For a borderless look, the gap is kept narrow by design. If you need a dark-mode feel (black gaps), the output PNG can be post-processed with any image editor to invert the background.

Size Recommendations by Platform

• Instagram feed. Square (1:1) is the native Instagram aspect ratio. The 2×2 layout produces a 1200×1200px square PNG — ideal for Instagram posts.
• Twitter/X. A 2×1 landscape collage fits Twitter's image display without cropping. Twitter displays landscape images at up to 1200×628px.
• Facebook. Facebook displays shared photos at up to 1200×628px. A 2×1 or 3×1 layout works well for Facebook albums.
• WhatsApp. WhatsApp compresses shared images aggressively. For quality, send as a Document rather than an image — this bypasses WhatsApp's compression.
• Print. At 1200px wide and 96 DPI screen resolution, the output is suitable for digital display only. For printing at 300 DPI, you would need source images that produce a minimum 1200px cell at 300 DPI — roughly 3600px-wide outputs. Use a desktop app for print-quality collages.

DevTools Privacy Verification

1. Open DevTools (F12) and go to the Network tab.
2. Upload photos to each slot in the collage maker.
3. Click Generate Collage and then Download PNG.
4. Inspect the Network tab — you will see zero POST requests containing image data. The Canvas API composites all images locally in browser memory. The generated blob is downloaded directly from memory to disk.

Photo Collage Maker Comparison

FAQ

Can I use photos of different sizes?

Yes. Cover-fit rendering scales each photo to fill its cell without stretching. The center of each photo is displayed — cropping the edges if the photo's aspect ratio differs from the cell's square shape. For photos with important subjects near the edges, consider pre-cropping to square before uploading.

Can I change the gap color or size?

Not currently — the default is an 8px white gap. If you need a different background color between cells, download the PNG and open it in an image editor, then fill the white areas with your target color using a flood-fill tool.

What image formats are supported?

Any format your browser can display: JPEG, PNG, WebP, GIF (static), AVIF, and HEIC (on Safari). HEIC files from iPhone can be converted first using brevio HEIC to JPG if they don't display correctly.

Why does my collage look blurry?

Blurriness usually means the source images were lower resolution than the cell size requires. For a 2×2 layout at 1200px wide, each cell is approximately 596×596px. Source images under 600px wide will be upscaled and may appear soft. Use higher-resolution source photos for a sharper result.

Can I add text to the collage?

Text overlay is not supported in the collage maker. After downloading the PNG, open it in brevio Meme Generator or brevio Image Watermark to add a text overlay without a third-party app.