What the tool actually does
Three measured steps, one after the other.
It measures the film base. The tool reads the brightest points of your negative in red, in green and in blue — separately. On color film those three numbers sit far apart, and that gap is the orange mask. The stats line under the picture shows the exact values it measured.
It subtracts the mask and inverts. Each color channel is pulled down by its own base level before the colors are flipped, so clear film becomes true black and dense dye becomes clean white — no blue tint, because nothing is left to cause it. If the automatic reading does not suit your negative, press “Pick the lightest spot” and click an unexposed film edge: the tool takes its white point from exactly what you clicked, the way a darkroom printer dodges the meter.
It stretches the range. What is left is expanded to the full brightness range, so the photo gets real blacks, real whites and the contrast the negative carries. The brightness slider fine-tunes the result without re-measuring anything.
Why no upload matters for family negatives
A box of negatives is often the only copy of moments that exist nowhere else — and unlike prints, they cannot be replaced by photographing them again. Negative-scanning apps and online converters regularly ask for the film to be uploaded to a server, or stop after a few frames until a subscription is paid. Every step of this tool happens in the page you have open; closing the tab erases everything, and there is no frame limit because there is no server doing the counting.
From negative to a gift
The photo that comes out is a full printable image. Collect several converted frames into one file with the images to PDF tool and print them for the family book, or let the grandchildren color grandma’s wedding themselves with the photo to coloring page tool. If the negatives are dusty or scratched, run each frame through the scratch remover first — conversion keeps the damage, it does not repair it. That is the Christmas hub’s fix-then-gift order too: fix first, gift second — a revived print framed is the gift that gets kept.
The whole journey — from a box in the closet to printed photos, what each path costs, and which strips are worth keeping — is walked in the guide What do you do with a box of old photo negatives?.
Questions
Why do my inverted negatives come out blue?
Color negative film has an orange mask built into the base — clear film is orange, not white, so each color channel sits on a different starting level. A plain color inversion maps that orange to blue, because orange and blue are opposites. The fix is not a filter: the tool measures the film base in red, in green and in blue separately, subtracts each level, and only then stretches the picture to full range. That is the same correction a photo editor does by hand with curves.
How do I get the negative into the computer?
Two ways work. If you have a flatbed scanner, scan the negative at the highest resolution the scanner offers and drop the file here. Without a scanner, photograph the negative against a bright, even white light — a window with thin clouds, or a phone or tablet showing a plain white page — then bring the photo here. Photographing through the back of the film mirrors the picture; tick 'The picture is mirrored' to flip it back.
Can it convert a whole strip at once?
The conversion works on the whole file, so a strip comes out as a strip of positives side by side. To save one photo per frame, crop the strip first — the image cropper on this site does that without uploading anything — and convert each cropped frame here.
Why does my converted photo have black bars around it?
That black border is the unexposed film around the frame — the strip's edge, which holds no picture, so it converts to pure black. Tick 'Trim the black film edges' under the picture and the saved photo is cut back to the picture itself, with a tiny safety margin left so nothing of the photo is ever cut. The tool only cuts borders that are black along their whole length, and never more than a third of a side, so a dark night photo keeps at least two-thirds of every side — if anything you wanted is gone, untick it.
What about black-and-white negatives?
Switch the film type to black-and-white. The tool then works on brightness alone: the darkest parts of the negative become the brightest parts of the photo, stretched to full range. Black-and-white film has no orange mask, so the color correction is not needed there. And if you load a colour negative with the film type still on black-and-white, the line under the picture tells you — switch back to colour film and the colours return.
Does this restore or improve the photo?
It converts, it does not invent. Scratches, dust and fungus on the film are still visible after conversion — remove them afterwards with the old photo scratch remover, and if an old print has faded colors, the faded photo color restorer measures and revives those. The result can also never be sharper or cleaner than the scan or phone photo you start with. The saved photo has a long side of up to 2400 pixels, whatever size the scan was — enough for a sharp print about 20 cm wide.
Is my negative uploaded anywhere?
No. The measurement, the conversion and the download are all computed in the page you have open. Nothing is sent to a server, there is no watermark on the result, no daily limit, and no account is needed.