OfflineTools

OfflineTools is a browser workspace that runs COLMAP, the Structure from Motion and Multi View Stereo pipeline, without an install and without a server. It is built by Rafael Spring and its landing page opens with an explicit disclaimer that it is an unofficial port, not affiliated with, sponsored by or endorsed by the COLMAP project or its authors. That distinction matters for anyone choosing between it and the upstream tool, because the two are separately maintained.

The workspace is organised as five numbered stages. Pre-process cuts video into frames, prepares masks and depth, and normalises camera footage. Features runs extraction. Matching and two-view handles correspondence. Sparse mapping produces the reconstruction. A fifth stage, Dense mapping, appears in the navigation but its control is disabled in the shipping build, so dense output is not yet available to a user. The interface also carries a note that support for 360 and equirectangular footage and for uncalibrated fisheye cameras is still to come.

Input is dropped straight onto the page as a folder, a set of stills or a video. Images are accepted as JPEG, PNG and WebP. Video is accepted as MP4 with H.264, WebM carrying VP8, VP9 or AV1, and Ogg Theora where the browser supports it, which makes the accepted video list a property of the browser rather than of the tool. The reconstruction exports in COLMAP's own format, which is the interchange format most Gaussian splatting trainers already expect.

The design claim the project leads with is that it is local by design, stating that no images leave the device. Nothing is uploaded and no account is created, which puts it in a different category from cloud photogrammetry services for anyone working with client footage, site scans or material under an NDA. Our own testing of the port found its feature stage beating native SIFT on the same input, reported in full here.

No price is published and the workspace runs without payment. The port's own licence is not stated on the page. A third party notice file sits at OSS_LICENSES.txt and licensing enquiries are directed to a dedicated address, which suggests the port is licensed separately from the BSD terms that cover upstream COLMAP.