Resize 3D LUT grid sizes and convert between .cube & .3dl — fast, free, and private.
Select .cube or .3dl files to convert
Choose a file or drag & drop it here
.cube and .3dl formats, up to 10 files
Conversion complete!
Drop your .cube or .3dl LUT files into the converter. Batch convert up to 10 files at once — no download or installation required.
Select your target grid size (17x, 33x, or 65x) and output format. The converter auto-detects your source LUT size and format.
Get your converted LUT instantly — resize from 65 to 17, convert .cube to .3dl, or any combination. Multiple files are bundled into a ZIP.
The industry-standard 3D LUT format used by most editing and color grading software. Uses floating-point RGB values. Convert .cube LUTs online between any grid size, or convert .cube to .3dl for Autodesk workflows.
DaVinci Resolve, Premiere Pro, Final Cut Pro, After Effects, Baselight, Scratch, SmallHD, Atomos
Autodesk's 3D LUT format using integer values (10-bit or 12-bit). Common in high-end finishing and VFX pipelines. Convert .3dl to .cube for broader software compatibility, or resize .3dl LUTs to any grid size.
Autodesk Flame, Lustre, Nuke, DaVinci Resolve, Assimilate Scratch
3D LUTs are the backbone of modern color management — from on-set monitoring to final delivery. But different stages of production require different grid sizes. A 65x65x65 LUT built for finishing in DaVinci Resolve cannot be loaded onto a camera or field monitor that only accepts 17-point LUTs. That's why you need a free online LUT converter: to resize LUT grid sizes instantly without installing desktop software.
CINEM8 is a free online 3D LUT converter that uses tetrahedral interpolation — the same algorithm behind DaVinci Resolve, OpenColorIO, and other professional color science tools. Whether you need to convert a LUT from 65 to 17 for on-set monitoring, resize to 33x33x33 for post-production, or convert .cube to .3dl for Autodesk pipelines, the tool preserves color accuracy across the entire gamut.
Common workflows that require a LUT converter online:
A 3D LUT (Look-Up Table) is a file that maps input color values to output color values in three-dimensional color space. It is used in color grading to apply a specific look or color transformation to video and photo footage. Unlike 1D LUTs that adjust each color channel independently, 3D LUTs can perform complex cross-channel color transformations, making them essential for creative looks and technical color space conversions.
The .cube format stores color values as floating-point numbers between 0 and 1. It is the most widely supported format and works with DaVinci Resolve, Premiere Pro, Final Cut Pro, After Effects, and most monitoring hardware. The .3dl format uses integer values (typically 10-bit or 12-bit) and originated from Autodesk applications like Lustre and Flame. It is common in high-end VFX and finishing pipelines.
Different devices and software require specific grid sizes. On-set monitoring hardware and in-camera LUT slots typically need 17x17x17 grids due to memory and processing constraints. The industry standard for post-production color grading is 33x33x33, which provides a good balance between accuracy and file size. High-end workflows may use 65x65x65 for maximum precision, particularly in HDR and wide color gamut projects.
CINEM8 uses tetrahedral interpolation — the same algorithm used by DaVinci Resolve and OpenColorIO. This produces the most accurate results possible when resizing LUTs. Upsampling (e.g., 17 to 33 or 65) mathematically reconstructs intermediate values with high fidelity. Downsampling (e.g., 65 to 17) introduces minimal rounding that is virtually imperceptible in practical use.
No. CINEM8 LUT Converter runs entirely in your browser using Web Worker technology. Your files are processed locally on your device and are never uploaded, stored, or transmitted to any server. You can verify this by using the tool with your internet connection disabled — it works completely offline after the initial page load.
Tetrahedral interpolation is a mathematical method for resampling 3D LUT data. It divides each cube cell of the LUT into six tetrahedra and interpolates using four vertices. This produces smoother, more accurate results than trilinear interpolation (which uses eight vertices and can create visible stepping in gradients). It is the industry-standard method used by DaVinci Resolve, OpenColorIO, Lattice, and most professional color management systems.
Most professional cinema cameras support loading .cube LUTs for on-set monitoring, including ARRI ALEXA (Mini, 35, LF), Sony VENICE and FX series, RED DSMC2 and V-RAPTOR, Blackmagic URSA and Pocket Cinema Camera, Canon C70/C300/C500, and Panasonic VariCam and S series. Field monitors from SmallHD, Atomos (Ninja, Shogun), Teradek, and TVLogic also support .cube LUTs for real-time preview.
Upload your 65x65x65 LUT file (.cube or .3dl), select 17x17x17 as the target grid size, and click Convert. The converter uses tetrahedral interpolation to downsample the LUT while preserving color accuracy. The resulting 17-point LUT can be loaded directly onto cameras from Sony (FX6, FX3, VENICE), ARRI (ALEXA Mini, ALEXA 35), RED, Blackmagic, and Canon, as well as field monitors from SmallHD, Atomos, and Teradek.
Yes. CINEM8 LUT Converter supports both directions: .cube to .3dl and .3dl to .cube. Simply upload your source file, choose your desired output format, and convert. The tool automatically handles the value conversion between floating-point (.cube) and integer (.3dl) representations.
No. CINEM8 LUT Converter is a free online tool that runs entirely in your web browser. There is no software to download, no plugins to install, and no account to create. Just open the page, drop your LUT files, and convert. It works on any device with a modern browser — Windows, Mac, Linux, even tablets and phones.
Yes. The converter works with any standard .cube or .3dl LUT file regardless of the camera system or color science it was designed for. This includes LUTs for Sony S-Log2/S-Log3, ARRI LogC3/LogC4, RED IPP2, Blackmagic Film/Video, Canon C-Log, Panasonic V-Log, and any other log-to-display or creative look LUT. The converter preserves the color transform — it only changes the grid resolution or file format.
Yes. CINEM8 LUT Converter is completely free to use with no limitations, no signup required, and no watermarks. You can convert as many LUT files as you need, as often as you want. Unlike desktop LUT tools like Lattice or LUT Robot, there is no purchase required.