Photo Brightness
Brighten or darken any photo with a fine-grained slider. Drag right to lift, left to deepen. 100% browser-side, instant preview.
Drop a photo to start
JPG, PNG, WebP, HEIC up to 40 MB · stays in your browser
Never uploaded · 100% browser-side
How it works
- 1
Drop your photo
Drag & drop or browse to upload. JPG, PNG, WebP, HEIC up to 40 MB.
- 2
Drag the brightness slider
The slider runs from -100 (much darker) to +100 (much brighter). Each step adds or subtracts a constant offset to every pixel - the result updates live as you drag.
- 3
Download or open in editor
Save the adjusted result, or open it in our AI editor to stack additional adjustments, filters, and AI tools.
Why use this online tool
Bipolar slider
One control covers both brightening AND darkening - no need to switch tools. Drag right past 0 to lift, left below 0 to deepen.
Live preview
Drag the slider and see the result update instantly. No 'apply' click - find the exact value that works for your photo, then save.
100% browser-side
The adjustment runs on a Canvas in your browser. Your photo never leaves your device - no upload, no server, no privacy risk.
Free, no watermark
Unlimited adjustments, no signup, no overlay on the output.
When to use it
- Underexposed phone photos taken at dusk or in shadow that need a quick lift
- Overexposed beach / snow shots with blown-out highlights to pull back
- Document scans where the page looks dim and needs even brightness
- Product photos that look too dark on website backgrounds and need a +20 boost
- Old scanned photos darkened by age that benefit from a gentle +10-15 lift
Frequently asked questions
- Does this upload my photo to a server?
- No. The adjustment runs entirely in your browser using direct ImageData pixel manipulation. Your image never leaves your device.
- What's the difference between brightness and exposure?
- Brightness adds a constant offset to every pixel - bright pixels and dark pixels lift the same amount. Exposure (used in raw editors) is a multiplicative scale - bright pixels grow more than dark ones, mimicking a real camera shutter. For most quick fixes, brightness is enough; exposure is for raw-file workflows.
- Why does +100 brightness clip my highlights?
- Adding the offset pushes already-bright pixels past 255 (the maximum), where they get clamped to white. To recover detail in highlights, drop brightness and pull contrast or use the Exposure tool in our editor instead.
- Brightness vs contrast - which one first?
- Brightness moves the whole histogram up or down. Contrast spreads or compresses the histogram around mid-grey. Adjust brightness first to set overall exposure, then contrast for tonal punch. Both sliders are independent so the order matters less than getting both right.
- Can I reset to the original?
- Yes - drop the slider to 0 (or whichever value means 'no change' for this control) to see the original. The source is never modified - the tool always operates on a copy.
- Can I stack multiple adjustments?
- In this widget, one slider at a time. For stacked edits (e.g. brightness + contrast + saturation), use our AI editor where multiple adjustments live side-by-side as non-destructive layers.
Related free tools
Photo Contrast
Push or pull contrast with a single slider. Right for punchier highlights and shadows, left for a flatter, softer look.
Photo Saturation
Pump up colour intensity for vibrant photos, or pull it down toward grayscale. Single slider, live preview, no upload.
Photo Temperature
Shift the colour temperature warmer (golden / sunset) or cooler (blue / overcast) with one slider. The white-balance fix without the menus.
Vivid Filter
Pump up the saturation and bump contrast for a punchy, vibrant look. Like Instagram's natural-looking but slightly amped vivid preset.
Need more than just photo brightness?
Our AI editor goes way beyond simple transforms - background removal, style transfer, upscaling, photo-to-anime, and 50+ more AI tools. First 5 edits are on us.
Open AI editor - 5 free credits