UD5 Toolkit
Kaleidoscope Maker - Online Reflect & Rotate Photo
Turn any photo into a beautiful kaleidoscope pattern by reflecting and rotating segments. Adjust parameters.
Image Straighten Tool - Online Fix Crooked Horizons
Image Straighten Tool
Fix Crooked Horizons Online – Free, Fast & Private
Straighten tilted photos with pixel‑perfect precision. No upload, no ads, just straight horizons.
Drag & drop your image here
or click to browse – supports JPG, PNG, WebP, GIF
Why Use Our Image Straighten Tool?
- 100% Private – images never leave your device.
- No Cropping – canvas expands to fit the entire rotated image.
- High‑Resolution Output – original pixel density is kept.
- Transparent & Custom Backgrounds – fill empty areas with any color.
- 0.1° Precision – perfect for architectural and landscape shots.
- Works Offline – no internet required after the page loads.
- Free & Unlimited – no watermarks, no registration.
How to Straighten a Photo
- Upload your image using drag & drop or the file picker.
- Move the angle slider until the horizon looks perfectly straight.
- (Optional) Choose a background color for the areas revealed by rotation.
- Click Download – your straightened photo is saved instantly.
Tip: use the exact value input if you know the required correction down to 0.1°.
Frequently Asked Questions
No. Your privacy is paramount. All processing happens directly in your browser. The image is never transmitted anywhere.
You can open JPG, PNG, WebP, GIF, BMP, and TIFF (where supported by your browser). When downloading, you'll get a PNG (if transparent background is selected) or a high‑quality JPEG.
To avoid cropping, the canvas automatically enlarges to fit the entire rotated image. The empty corners are filled with your selected background color (or transparency). You can choose white, black, or any custom fill.
Yes! The tool is fully responsive and works on any modern mobile browser. Simply tap to upload and use the slider to fix your horizon.
Absolutely none. The tool is free to use without any restrictions or hidden watermarks.
The slider works in 0.1° increments, and you can type an exact number for surgical precision – ideal for architecture and product shots.
Image Lens Blur Effect - Online Fake Depth of Field
Apply a realistic lens blur (bokeh) to an image. Simulate shallow depth of field. Adjust aperture shape and intensity. Local canvas.
Magnetic Declination Estimator - Online Compass Correction
Get the approximate magnetic declination for a given latitude and longitude. Apply correction to your compass.
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.
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.
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.
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.
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.
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.
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 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.
Photo Vintage Effect - Online Sepia & Retro Filter Tool
Apply vintage and sepia effects to your photos. Adjust grain, vignette, and tone curves. Download filtered image. Local canvas manipulation.
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.
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.
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.
Microwave Wattage Converter – Online Recipe Time Adjuster
Enter the recipe's wattage and your microwave's wattage to convert cooking time. Prevent burnt or cold food.
JPEG EXIF Remover - Online Strip Metadata for Privacy
Remove all EXIF data (GPS, camera info) from a JPEG before uploading. Processed locally. Protect your privacy.
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.
ImageDecoder API Demo - Online Progressive Decode
Decode an image progressively using the ImageDecoder API. See partial results and metadata. Modern alternative to <img>.
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.
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.
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.
Recent Earthquake Tracker - Online USGS Live Data Map
View recent earthquakes worldwide on a map. Fetches public USGS GeoJSON feed directly from browser. Real-time data.
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.
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.
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.
HTML Formatter & Beautifier - Online HTML Cleaner
Tidy up messy HTML code with our online formatter and beautifier. Indent and clean your markup, preview the output instantly. No data is uploaded, everything runs in your browser.
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.
Binary to Text Converter - Online Decode Bits to String
Paste binary sequences and convert them back to readable text. Supports space-separated and 8-bit formatted strings. Quick encoding reconversion.