Upload a photo and fine-tune brightness, contrast, saturation, and blur — all in your browser with live preview.
Fine-tune brightness, contrast, saturation, and apply Gaussian blur to your photos directly in your browser using the Canvas API. Upload an image up to 25 MB, adjust each parameter with real-time sliders — including per-channel RGB contrast to fix color casts — and download the result as PNG or JPEG. No server upload, no sign-up, instant results.
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Drag & drop an image here, or click to browse
Supports JPEG, PNG, WebP, GIF, BMP, SVG — up to 25 MB
Preview
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🎚️ Adjustments
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-1.0 (black) to +1.0 (white). Negative darkens, positive lightens.
◐ Contrast:
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-1.0 (flat gray) to +1.0 (maximum). Stretches or compresses tonal range.
0–5 px for noise reduction, 10–20 px for artistic blur. Applied to entire image.
📖 What Each Adjustment Does
☀️ Brightness
Shifts all pixel values up or down uniformly. Range: -1.0 (black) to +1.0 (white). Use for underexposed or overexposed photos. Unlike exposure (which affects highlights more), brightness applies an equal offset to every pixel.
◐ Contrast
Stretches or compresses the difference between light and dark pixels. Range: -1.0 (flat gray) to +1.0 (maximum stretch). In Per Channel mode, you can adjust Red, Green, and Blue contrast independently — perfect for fixing color casts (e.g., reduce Blue contrast to warm up a cold photo).
🎨 Saturation
Controls color intensity. 0.0 = grayscale (black and white), 1.0 = original colors, 2.0 = doubled intensity. Small increments of +0.10 to +0.20 are recommended for natural results — large jumps can make skin tones look unnatural.
💨 Gaussian Blur
Applies a convolution kernel to soften the image uniformly. Radius 1–5 px is ideal for noise reduction and smoothing. Radius 10–20 px produces an artistic soft-focus effect. Note: this blurs the entire image — for selective background blur, use a tool with masking capabilities.
❓ Frequently Asked Questions
How do I adjust the brightness of a photo without Photoshop?
Upload your photo to this free browser-based tool. Drag the Brightness slider to the right to lighten dark images or left to darken overexposed ones. The preview updates in real time using the Canvas API — no software installation, no sign-up. When you're satisfied, download the adjusted image as PNG or JPEG. All processing happens on your device; nothing is uploaded anywhere.
What's the difference between brightness and exposure in photo editing?
Brightness applies a uniform shift to every pixel's value — the entire image gets lighter or darker equally. Exposure mimics camera aperture: it affects highlights more than shadows, similar to how a real camera sensor responds to light. This tool uses brightness (linear shift), which is ideal for correcting overall image lightness without altering the tonal relationship between shadows and highlights. For exposure-style editing, use the Contrast slider to adjust the tonal range.
Can I increase saturation without making skin tones look orange?
Yes — the key is restraint and per-channel control. Increase Saturation in small increments (+0.10 to +0.20) rather than large jumps. If skin tones still appear too warm, switch to Per Channel mode and slightly reduce Red channel contrast (-0.05 to -0.10) while keeping Green and Blue at neutral. This targets warm tones without desaturating the entire image. The live preview lets you see the effect immediately.
How to blur the background of a photo online for free?
This tool's Gaussian Blur applies to the entire image uniformly — it cannot selectively blur only the background. For full-image softening (artistic blur, noise reduction at low radius), adjust the Blur Radius slider from 1 to 20 pixels. For selective background blur (bokeh effect), you would need a tool with masking or depth-based blur capabilities, which is beyond the scope of this single-purpose editor.
Is there a free tool for brightness, contrast, and saturation all in one?
Yes — this Image Filters & Adjustments tool combines brightness, contrast, saturation, and Gaussian blur in a single adjustment panel with live Canvas preview. Unlike PineTools (which splits brightness/contrast across separate pages) or full editors like Photopea (complex multi-menu UI), all four adjustments are accessible from one screen. Adjust multiple parameters simultaneously and see the combined result instantly.
Are online photo editors safe for private photos?
This tool processes images entirely in your browser using the Canvas API and FileReader — your photos are never transmitted to any server. You can verify this: after the page loads, disconnect from the internet and the tool continues to work. Unlike server-based editors (PineTools stores uploads temporarily, Canva requires cloud sync), zero bytes leave your device. For sensitive photos like ID documents, medical images, or personal photos, this client-side architecture provides a genuine privacy guarantee.