How to use the Negative Viewer (step-by-step)
Short answer: open Negative Viewer in your browser, hold a film negative against an even backlight, point your camera at it, and press Start camera. The site inverts the colors live and shows you the positive image. Total setup time is under one minute.
Set up an even backlight
Open a fully white image on a second phone, tablet, or computer screen at maximum brightness. Alternatives: a small lightbox, a piece of frosted glass on a window during daylight, or a tracing-paper diffuser over a desk lamp. Even, diffuse light is what matters — point sources create hot spots that ruin the preview.
Hold the negative against the light
Place the negative directly against the lit surface, emulsion side away from the camera (the slightly duller, less reflective side faces the camera). Keep it flat — gentle pressure with two fingers along the edges of the strip works for 35mm.
Open the viewer and grant camera access
Open negativeviewer.tokugai.com on the device you'll point at the negative. Press Start camera. Your browser will ask permission to use the camera the first time — grant it. The site uses HTTPS, which is required for camera access.
Frame and focus on the negative
Move the camera close enough that one negative frame roughly fills the viewport. On phones, tap the screen to lock focus on the negative — autofocus will sometimes hunt for the backlight instead. Brace your elbows or use a small tripod for sharper results.
Adjust the backlight if the colors look off
If the preview looks too blue or too orange, the issue is usually the backlight color, not the negative. Most phone screens are calibrated near 6500K daylight, which is correct. Avoid yellow LEDs, candle light, or warm screens, which add a strong cast.
Save the frame you want
Press Save photo to download the current preview as a PNG. The file lands in your device's Downloads folder. For longer rolls, just slide the negative strip across without moving the camera and tap Save photo for each frame.
Tips for sharper results
- Use the rear camera, not the front camera. Rear cameras have higher resolution and better optics. The viewer asks for the environment-facing camera by default.
- Brace the camera. Even a small tripod or a stack of books that lets the phone rest still will outperform handheld for detail.
- Clean the negative first. Use a microfiber cloth or a rocket blower. Dust looks like white specks on the positive preview.
- Keep the camera lens parallel to the negative. Any tilt becomes a keystone distortion in the saved image.
- Do final color correction in a photo editor. The browser inversion is mathematically correct, but film bases carry an orange mask. After saving, drop the PNG into Photos, Lightroom, or any free editor and adjust white balance and contrast to taste.
Browser compatibility
| Browser | Camera access | Notes |
|---|---|---|
| Chrome (desktop and Android) | Supported | Requires HTTPS. Permission stored per origin. |
| Safari (iOS 11+ and macOS) | Supported | Permission must be granted on every new visit unless you add the site to the home screen. |
| Edge | Supported | Same behavior as Chrome. |
| Firefox (desktop and Android) | Supported | Granular per-camera selection if multiple devices are attached. |
| In-app browsers (Instagram, WeChat, LINE) | Often blocked | Open the link in Chrome or Safari directly if the camera will not start. |
Common problems
Camera won't start
The two usual causes are: the page isn't on HTTPS (camera access requires it), or the browser remembered an earlier denial. In Chrome, click the lock icon in the address bar and re-allow the camera. In Safari iOS, go to Settings → Safari → Camera and confirm "Ask" or "Allow."
The image is dark
Increase backlight brightness. A phone screen at 50% brightness is rarely enough; push it to 100%. If a guide rail or window frame intrudes into the camera's view, it dilutes the average exposure.
The image is sharp but the colors look weird
Color negatives have an orange-tinted base. After the live inversion, that orange becomes a slight blue cast. This is normal — see our guide on film negatives for the full explanation, or simply correct white balance after saving.