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Responsive Photo Gallery Template Builder

Build production-ready responsive photo gallery HTML/CSS templates. Upload images, configure layouts, hover effects, lightbox, and export clean code.

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Category Graphic Generators
Drop images here or click to browse JPG, PNG, GIF, WebP, AVIF · Max 10MB each · Up to 50 images
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About

A misconfigured photo gallery degrades perceived page quality and directly impacts bounce rate. Incorrect aspect ratios crop subject matter. Missing srcset attributes force mobile users to download 4000px originals on 3G connections. Inaccessible galleries lock out screen reader users entirely. This tool generates production-grade HTML and CSS for responsive photo galleries using CSS Grid with auto-fill and minmax() sizing functions. It calculates flex-grow values from image aspect ratios for justified layouts and applies column-count for masonry approximations. The generated code includes loading="lazy" attributes, proper alt text propagation, and keyboard-navigable lightbox markup. No runtime JavaScript framework is required in the output.

Limitations: masonry layout uses CSS multi-column, which fills column-first rather than row-first. True row-based masonry requires JavaScript or the experimental CSS masonry grid value not yet supported cross-browser. Justified layout approximation works best when images share similar aspect ratios within 0.5 standard deviations. Pro tip: compress images before upload. This tool does not perform lossy compression. Feed it optimized assets for best results.

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Formulas

The responsive grid column count is determined by the CSS minmax() function within repeat():

grid-template-columns: repeat(auto-fill, minmax(Wmin, 1fr))

Where Wmin = minimum column width in px. The browser calculates the number of columns n as:

n = floor(Wcontainer + gapWmin + gap)

For the justified layout, each image receives a flex-grow value proportional to its aspect ratio:

flex-grow = WimgHimg = AR

Where Wimg = original image width, Himg = original image height, AR = aspect ratio. For the masonry layout, column count at each breakpoint is defined as:

{
columns = 1 if Wvp < 480pxcolumns = 2 if Wvp < 768pxcolumns = n otherwise

Where Wvp = viewport width and n = user-configured column count. The lightbox overlay uses position: fixed with inset: 0 and centers the active image via object-fit: contain within the viewport bounds.

Reference Data

Layout TypeCSS MethodBest ForResponsive BehaviorBrowser Support
Grid (Equal)display: grid + minmax()Uniform thumbnails, portfoliosColumns reduce automatically97%+
Masonrycolumn-count + break-inside: avoidMixed aspect ratios, Pinterest-styleColumn count reduces via media query98%+
Justifieddisplay: flex + flex-grow by ratioPhotography showcasesWraps to fewer items per row99%+
Carouselscroll-snap-typeHero sections, featured imagesSingle item scroll on mobile95%+
LightboxCSS :target or JS overlayFull-screen detail viewingFull viewport on all sizes99%+
Aspect Ratioaspect-ratio propertyConsistent card heightsMaintains ratio at any width93%+
Flex Wrapflex-wrap: wrapSimple responsive rowsItems wrap naturally99%+
Auto-fitrepeat(auto-fit, ...)Unknown item countFills available space97%+
Auto-fillrepeat(auto-fill, ...)Fixed minimum widthsPreserves minimum column size97%+
Subgridgrid-template: subgridAligned captions across rowsInherits parent tracks85%
Container Query@containerWidget/component galleriesResponds to parent, not viewport87%
Object-fit Coverobject-fit: coverCropped uniform thumbnailsConsistent sizing regardless of source97%+
Object-fit Containobject-fit: containFull image visibilityLetterboxing at edges97%+
Gap PropertygapConsistent spacingScales with container96%+
Lazy Loadingloading="lazy"Performance optimizationDefers off-screen images92%+

Frequently Asked Questions

The grid layout forces all items into equal-sized cells using object-fit: cover, which crops images to fill the cell. The masonry layout uses CSS column-count with break-inside: avoid, allowing each image to display at its natural aspect ratio. The tradeoff is that masonry fills columns top-to-bottom rather than left-to-right, so visual reading order may differ from source order. For galleries with aspect ratios varying more than 2:1, masonry produces significantly less visual cropping.
Most browsers allocate approximately 5MB to 10MB per origin for localStorage. This tool monitors storage usage and will display a warning toast when approaching 80% capacity. If a save fails, the tool catches the QuotaExceededError and preserves your configuration without the image data. For galleries exceeding 15 high-resolution images, use URL references instead of base64 uploads to avoid quota issues.
No. The output is self-contained HTML and CSS. The lightbox uses minimal vanilla JavaScript (under 40 lines) for keyboard navigation and close-on-click behavior. If you disable the lightbox option, the output is pure HTML and CSS with zero JavaScript. The responsive behavior relies entirely on CSS Grid minmax() and media queries.
Each image's flex-grow is set to its aspect ratio (width ÷ height). A landscape image with dimensions 1600×900 receives flex-grow: 1.78, while a portrait image at 900×1200 receives 0.75. This causes wider images to claim proportionally more row space. The row height is set via a fixed flex-basis height (e.g., 250px), and images stretch horizontally to fill the row.
Yes. The tool accepts both file uploads and direct URL input. When using external URLs, be aware that CORS restrictions may prevent thumbnail preview generation via Canvas. The generated code will reference the original URLs directly. Ensure your image hosting supports hotlinking and serves proper Access-Control-Allow-Origin headers if you need cross-origin features.
The output includes role="list" on the gallery container and role="listitem" on each figure. All images carry the alt text you provide. The lightbox includes aria-modal="true", role="dialog", focus trapping within the overlay, and Escape key to close. Navigation buttons have aria-label attributes. The gallery respects prefers-reduced-motion by disabling hover transitions.