Free Image to Cubemap Converter — Turn 360° Panoramas Into Skybox Cross Layouts Online
The Edit The Image Image to Cubemap Converter is a free, browser-based tool that mathematically projects any 360° equirectangular panorama image into a standard 4×3 cross-layout cubemap — with all six cube faces (Front, Back, Left, Right, Top, Bottom) correctly mapped and ready for import into Unity, Unreal Engine, WebGL, or any game engine that accepts skybox textures — no sign-up, no 3D software, and no command-line tools required.
Upload your panorama, choose your face resolution, and download a production-ready skybox PNG in seconds, entirely within your browser.
🧊 Image to Cubemap Converter
Transform a 360° Equirectangular Panorama into a standardized Skybox layout.
What Is an Image to Cubemap Converter?
An image to cubemap converter is a browser-based spherical projection tool that applies inverse equirectangular-to-cubic mapping mathematics to convert the 2:1 aspect ratio latitude/longitude pixel data of a 360° panorama into six individual square face textures arranged in a standard cross layout.
Also known as a 360 to skybox converter, equirectangular to cubemap tool, or panorama to skybox generator, this browser-based converter works by computing the 3D direction vector for every pixel position on each of the six cube faces, converting those vectors to spherical longitude/latitude coordinates, and sampling the corresponding pixel from the source equirectangular image — outputting a single PNG where the six faces are arranged in a 4×3 grid at your chosen resolution (256×256, 512×512, or 1024×1024 per face) with no distortion correction required for standard use in game engines.
How to Use the Image to Cubemap Converter
- Go to edittheimage.app/image-to-cubemap — the tool loads instantly with no 3D engine account, no Blender installation, and no command-line environment required.
- Upload your 360° equirectangular panorama by clicking the drop zone or dragging a JPG, PNG, or WebP file onto it; your source image should have a 2:1 aspect ratio (for example, 4096×2048px) — this is the standard format output by 360° cameras, Google Street View exports, and HDRI sky libraries.
- Select your Cube Face Resolution from the dropdown — 256×256 per face for fast preview and lightweight game assets, 512×512 for standard quality suitable for most real-time 3D scenes, or 1024×1024 for high-resolution environments and close-up skybox inspection.
- Wait for the spherical projection calculation — a spinner appears while the tool performs inverse trigonometric mapping across all six faces; 256px processes in under a second, while 1024px may take 3–8 seconds depending on your device.
- Review the cross layout preview — the output shows the six cube faces arranged in the standard 4×3 cross pattern: Left, Front, Right, and Back across the middle row, Top above the Front face, and Bottom below the Front face.
- Click "Download Skybox Image" to save the finished cubemap cross PNG directly to your device — the filename includes the face resolution for easy asset management.
Why It Matters — When to Use This Free 360 to Skybox Converter
Game developers, 3D artists, and virtual reality creators working in Unity, Unreal Engine, and WebGL environments constantly need skybox textures — and most tools that perform equirectangular to cubemap conversion either require Blender, NVIDIA Texture Tools, or paid panorama software with significant learning curves.
This free browser-based panorama to skybox generator makes the conversion instant and accessible without any 3D application knowledge. Indie game developers building environments in Unity use this cubemap converter to transform free HDRI panoramas from sites like Poly Haven and HDRI Haven into the cross-layout PNG format that Unity's Skybox/6 Sided material shader accepts directly.
WebGL developers building immersive browser experiences with Three.js or Babylon.js use equirectangular to cubemap tools to prepare environment maps for reflections, background skyboxes, and image-based lighting without requiring server-side processing or Node.js scripts.
VR experience designers and 360° photographers use this tool to convert Google Street View exports, drone panoramas, and 360° camera outputs into skybox assets for Unreal Engine's sky sphere and environment map workflows, eliminating the need for command-line panorama_to_cubemap scripts or Python conversion tools.
Quick Tips — Getting the Best Results
- Your source image must be 2:1 aspect ratio for correct mapping: An equirectangular panorama that is not 2:1 (for example, a cropped or non-standard panorama) will produce distorted cube faces with misaligned horizon lines — always verify your source image dimensions before converting, and crop or pad to a 2:1 ratio if needed.
- 512×512 per face is the sweet spot for real-time game use: At 512px per face, the total output image is 2048×1536px — a manageable texture size that renders sharply in most in-game skybox contexts viewed from a standard camera field of view, without the GPU memory overhead of 1024px assets in scenes with many other textures.
- Use 1024px per face only for HDRI lighting and close-up inspection: If you're using the cubemap primarily for image-based lighting (IBL) reflections on materials rather than as a visible background, 512px per face is sufficient — the 1024px option is most valuable when the skybox is the primary visual focus of the scene or when capturing fine cloud and horizon detail.
- The cross layout is universal but face order varies by engine: The output uses a standard 4×3 cross arrangement (Left–Front–Right–Back across the middle, Top above Front, Bottom below Front) — Unity, Unreal, and most WebGL frameworks accept this layout directly, but always verify which face corresponds to which slot in your engine's skybox material before assigning textures.
Frequently Asked Questions
Q: What is an equirectangular image?
An equirectangular image is a 2:1 aspect ratio photograph or render that maps the full 360°×180° sphere of a scene onto a flat rectangular image using latitude and longitude coordinates — similar to a Mercator world map projection. It's the standard output format for 360° cameras (like Ricoh Theta and Insta360), Google Street View exports, and HDRI sky rendering software.
Q: What is the difference between a cubemap and a skybox?
A cubemap is the data structure — six square textures representing the six faces of a cube that surrounds a 3D scene. A skybox is the use case — a very large cube in a 3D scene textured with a cubemap to create the illusion of a distant sky and environment. In practice, the terms are used interchangeably when referring to environment textures in game engines.
Q: How do I import a cubemap cross PNG into Unity?
In Unity, import your cubemap PNG into the Assets folder, select it in the Project panel, change the Texture Type to "Cubemap" in the Inspector, set the Mapping to "Cross" layout, and click Apply. Unity will automatically parse the 4×3 cross layout and assign the six faces to the correct cubemap slots, which you can then assign to a Skybox/6 Sided material or use as a reflection probe source.
Q: What resolution should I use for a cubemap in Unreal Engine?
Unreal Engine's documentation recommends cubemap face resolutions that are powers of two (256, 512, 1024, 2048) for optimal GPU texture compression. For typical outdoor sky environments, 1024×1024 per face is the standard — this produces a 4096×3072px cross image that Unreal can import directly as a Texture Cube asset via the Content Browser.
Q: Can I use HDR panoramas (.hdr or .exr files) with this tool?
This tool processes standard LDR image formats (JPG, PNG, WebP) that browsers can natively decode. True HDR panoramas in .hdr or .exr format contain 32-bit floating point data that browsers cannot read natively — you would need to convert HDR/EXR files to a tone-mapped PNG or JPEG first using software like GIMP, Photoshop, or darktable before using this browser-based converter.
Q: What is the correct face order for a standard cubemap cross layout?
In the standard 4×3 cross layout used by most game engines, the arrangement is: Top face in the second column, first row; Left face in the first column, second row; Front face in the second column, second row; Right face in the third column, second row; Back face in the fourth column, second row; and Bottom face in the second column, third row. This tool generates the output in exactly this order.