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GIF Brightness & Contrast — Adjust an Animated GIF
Adjust the brightness, contrast and saturation of an animated GIF right in your browser. Fine-tune every frame with continuous sliders — not just one-click presets — then re-encode. No upload, no watermark, your file never leaves your device.
Upload a GIF to adjust
Drop an animated GIF here, or click to browse. Everything runs locally on your device.
Paste (Ctrl/⌘+V) or drop an image — or import from a URL
GIF Brightness & Contrast lets you adjust the brightness, contrast, and saturation of an animated GIF entirely in your browser, with three continuous sliders rather than fixed one-click presets. Each slider runs from 0% to 200%, where 100% leaves that property unchanged — so you can rescue an over- or under-exposed clip, add punch with a contrast boost, or mute and intensify colours, all at once. The same adjustment is applied to every frame, and the animation's timing, frame count, and loop are preserved. Brightness multiplies each pixel's RGB value, contrast pushes values away from (or toward) mid-gray 127.5, and saturation scales each colour's distance from its Rec.709 luminance — the same maths a professional photo editor uses. Everything runs locally with no WebAssembly: your GIF is never uploaded, there is no queue, no watermark, no sign-up, and it works offline once the page has loaded. Because GIF stores at most 256 colours per frame, very strong settings can introduce slight banding after re-encoding — an inherent GIF limitation, not a flaw.
How It Works
Choose a tool
Pick from 120+ tools to resize, convert, compress, or enhance your image.
Upload & edit
Drag and drop your image and adjust the settings. It stays on your device.
Download
Save your result instantly — no watermark, no sign-up required.
Why Image Machine?
Your files never leave your device
All processing runs locally in your browser. Your images are never uploaded to a server.
Completely free
Every tool is free, with no limits, no watermarks, and no hidden costs.
Lightning fast
No upload waiting — your images are processed instantly on your own device.
Professional quality
Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
How is this different from the GIF Effects tool?
GIF Effects applies fixed one-click filters (grayscale, sepia, invert, and fixed-strength brighten/darken/saturate). This tool gives you continuous sliders for brightness, contrast, and saturation, so you can dial in the exact amount instead of a preset. Use Effects for a quick look; use this for precise correction.
What does each slider do?
Brightness multiplies every pixel's RGB value (100% unchanged, 0% black, 200% double). Contrast expands or compresses values around mid-gray (above 100% makes darks darker and lights lighter; below 100% flattens toward gray). Saturation scales each pixel's distance from its luminance (0% is fully grayscale, 200% doubles colour intensity).
Does it keep the animation and quality?
Yes. Every frame receives the same adjustment, and the per-frame delays, frame count, and loop setting are preserved. The image is re-quantized to GIF's 256-colour-per-frame palette on export, so extreme settings may show mild banding — that's a GIF format limit, not a bug.
Is it private and free?
Completely. The entire adjustment runs on your device in the browser — your GIF is never uploaded to a server. There's no watermark, no sign-up, and no file-size limit, and it works offline once the page has loaded.