Negs Puts a Film Lab in Your Browser and Leaves Your Photograph There

Negs has a particularly good answer to the photo editor that wants your picture before it tells you what anything does. The opening screen says, “Your photo stays in your browser.” You can also start with a sample. No need to introduce the internet to the family vacation just to see whether simulated film does something interesting to the clouds.

The editor divides the process into Prep, Lab and Output. Inside the lab, film, development, paper and print development each get their turn. That sequence gives the experiment a physical explanation: light reaches a simulated material, development changes it, and the result can become a simulated print. The developer’s page is the source for the behavior described here; this isn’t a measured comparison against a real roll of film.

A familiar preset picker often hides that chain behind a name and a thumbnail. Negs puts the stages where you can inspect them. That can turn an aimless search for “the nice one” into a more useful question about which stage produced the color or contrast you wanted. Finally, some exposure therapy that doesn’t require putting your photos on somebody else’s server.

A local workflow still needs a place to finish. Negs accepts camera RAW, JPEG, PNG and TIFF files, and its Export control is the obvious destination once the experiment works. The warning on departure says, “Negs doesn’t keep them,” referring to unexported edits. Keeping a private picture private and keeping a finished edit safe are different jobs. A tab can do the first while leaving the second to you (browsers remain browsers).

The preset link makes that separation useful. A friend can receive the same lab recipe without receiving the photograph, the crop or the preparatory adjustments. That is a cleaner way to discuss a look: both people can try the recipe on their own material. It also means a preset alone won’t reconstruct every decision in a finished image. A shared recipe doesn’t include the ingredients you left on your own counter.

The engine selector offers WebGPU and CPU. Negs describes the graphics-chip path as faster, but a speed claim needs a machine, an image and a clock before it becomes a benchmark. The fallback matters for a simpler reason: the editor has an answer when the preferred graphics path isn’t available. Film and paper previews also have a memory cost that the settings describe as about 100 MB; the page says they switch off if memory runs out.

A browser darkroom could be useful long after the novelty of another film look wears off, particularly when its settings can travel independently of its pictures. The practical boundary remains the same one the departure dialog spells out. Leaving the lab without exporting leaves the finished work in the tab.

The negative stays with you.