UD5 Toolkit
Image RGB Histogram – Online Per‑Channel Graph
Load an image to see separate red, green, blue histograms. Exposure and color balance tool.
Image Color Histogram - Online RGB Channel Graph
Image Color Histogram – Online RGB Channel Graph
Upload an image to instantly view its red, green, and blue channel histograms. All processing is done locally – no upload to server.
Drag & drop image here or click to browse
Frequently Asked Questions
A color histogram is a graph that shows the distribution of pixel intensities for each color channel (red, green, blue) in an image. The horizontal axis goes from 0 (no intensity) to 255 (full intensity), and the vertical axis shows how many pixels have that specific value. It helps visualize the overall brightness, contrast, and color balance of a photo.
- Left side (shadows): A high peak near 0 means many dark/black pixels. If data is clipped against the left edge, shadow details may be lost.
- Right side (highlights): A peak near 255 indicates many bright/white pixels. Clipping here means overexposed areas.
- Spread: A wide, even spread suggests high contrast and good tonal range. A narrow spike suggests low contrast.
- Color casts: If one channel's histogram is shifted compared to others, the image may have a color cast (e.g., red shift = too warm).
Photographers use RGB histograms to evaluate exposure and color accuracy directly from the image data, without relying on the camera's LCD. This tool lets you quickly check if any channel is underexposed or overexposed, and helps you decide whether to adjust exposure, white balance, or contrast in post-processing.
No – all processing is done directly in your browser using JavaScript. Your image never leaves your computer. This ensures complete privacy and real-time performance.
The tool works with any common image format supported by modern browsers, including JPEG, PNG, GIF, BMP, and WebP. Both regular and transparent images are supported; transparent areas are treated as white (255,255,255) for histogram calculation.
Colorblind‑Safe Palette Creator - Online for Data Viz
Generate a palette of N colors that are maximally distinguishable for common color vision deficiencies. Copy the hex codes.
Color Image to ASCII Art - Online True Color Converter
Convert any image into colored ASCII art using divs with background colors. Creates a stunning text‑based replica. View & copy HTML.
Posterize Image - Online Reduce Color Levels
Reduce the number of colors in your photo to create a bold, pop‑art poster effect. Adjust levels and download.
Pixel Data to BMP Generator - Online Raw Image Builder
Enter RGB values row by row and create a tiny BMP file. Understanding bitmap headers. Geeky developer tool.
Open Graph Image Generator - Online Social Card from Photo
Upload a photo and turn it into an optimized Open Graph image with title overlay. Perfect for blog social shares. Canvas.
Open Graph Image Maker - Online Simple OG:Image Text
Create a basic Open Graph image with a title, background color, and logo. Download as PNG. Perfect for small sites.
Image FFT Visualizer - Online See Frequency Domain
Upload an image and see its 2D FFT magnitude and phase. Learn how image filtering works. Educatinal tool. Canvas.
Sepia to Color Restorer - Online Approximate Original
Apply a tint remover that guesses the original colors from a sepia photo. Not perfect, but fun. All in canvas.
Tone Mapping Tool - Online Local HDR to LDR
Apply tone mapping algorithms to bring out details in highlights and shadows. Simulate HDR from a single image.
Audio Visualizer Bars - Online Live FFT Spectrum
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Image to Base64 Converter - Online Encode Picture to Text
Transform any image into a Base64 data URI for embedding directly into HTML, CSS, or JSON. Drag and drop support. Entirely browser-side conversion.
Chromatic Aberration Effect - Online Fake Lens Distort
Shift red and blue channels to create a realistic chromatic aberration (lens distortion) effect. Download glitched photo.
ImageDecoder API Demo - Online Progressive Decode
Decode an image progressively using the ImageDecoder API. See partial results and metadata. Modern alternative to <img>.
Timeline Creator - Online Generate Visual History Chart
Build a vertical timeline by entering events with dates and descriptions. Export as image or HTML. Perfect for project milestones.
Base64 to Image Converter - Online Decode & Preview
Decode Base64 encoded strings back into viewable images and download them as PNG. Useful for debugging APIs and data URIs. Secure local processing.
Image to ASCII Art Generator - Online Text Picture Converter
Convert any image into beautiful ASCII art. Adjust brightness and character set for the best effect. Share text-based pictures. Runs entirely in the browser.
Water Ripple Effect - Online Apply Pond Distortion
Add a realistic water ripple or heat haze distortion to your image. Download the warped photo. Canvas manipulation.
Snellen Eye Chart – Online Visual Acuity Test Simulation
Display a Snellen chart on screen and mark distance for a fun self-test. Not a replacement for professional exam.
Fire Effect Overlay - Online Add Flames to Photo
Add a dramatic fire or flame overlay to any image. Realistic blending. Adjust intensity. Download the hot result.
Image Sequence to GIF - Online Animated GIF Maker
Combine multiple static images into a single animated GIF. Adjust frame delay and order. No upload, in‑browser encoding.
Image to 3D Anaglyph - Online Red‑Cyan Effect Maker
Shift color channels to create a 3D anaglyph image. Grab your red‑cyan glasses! Can use different offset.
Enhanced Color Blindness Simulator - Image & UI Combined
Upload an image and also see a UI mockup under different deficiencies side‑by‑side. Powerful for inclusive design.
Audio Waveform Visualizer - Online See Your Sound
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Mermaid Diagram Renderer - Online Flowchart & UML Editor
Write Mermaid markdown and instantly see the rendered flowchart, sequence diagram, or Gantt chart. Copy SVG output. Browser-side rendering.
Social Media Image Creator - Online Quote & Post Maker
Design visual posts for Instagram, Twitter, Facebook. Background gradients, text, and stickers. Download as PNG. No sign‑up.
Image Background Remover - Online AI-Free Local Tool
Remove solid or similar backgrounds from images using color thresholding. No AI, just quick client-side canvas processing. Download as PNG.
Image Gooey / Melt Effect - Online Surreal Filter
Warps your image with a gooey, melting distortion. Adjust strength and radius. Download the surreal result. Local canvas.
Base64 Image Extractor - Online Download from Data URI
Paste a Base64 data URI and download the image directly. Supports JPEG, PNG, GIF, WebP. Safe local processing.
ASCII Binary to Text - Online Decode Bits
Paste a string of 0s and 1s and decode it back into ASCII text. Handles space‑separated blocks. Local.