UD5 Toolkit
Image Pixelator - Online Censor & Mosaic Effect Tool
Pixelate or censor parts of an image by dragging. Adjust block size for mosaic effect. Useful for hiding faces or sensitive data. Client-side processing.
Online Video Trimmer - Cut & Save Clips Locally
Online Video Trimmer
Cut and save video clips locally in your browser. No upload required — your files stay private and never leave your device.
Drop your video here or click to browse
Supports MP4, WebM, MOV, AVI, MKV — Max recommended: 2GB
Frequently Asked Questions
No, absolutely not. This tool processes everything locally in your browser using HTML5 and JavaScript. Your video never leaves your device — it's not uploaded, stored, or transmitted anywhere. This ensures complete privacy and security.
Most common video formats are supported: MP4, WebM, MOV, AVI, MKV, FLV, WMV, and 3GP. Support depends on your browser's video codec capabilities. Chrome and Firefox offer the broadest format support. For best results, use MP4 (H.264) files.
Browsers use the MediaRecorder API for local video processing, which outputs WebM format (the standardized open format for web video). While your input may be MP4, the exported clip will be WebM. Most modern video players support WebM. If you need MP4 output, you can use a free converter like HandBrake after downloading.
The tool provides frame-accurate trimming within your browser's capabilities. You can set start and end times down to hundredths of a second. Use the sliders for rough selection and the precise time input fields for exact frame positioning. Keyboard shortcuts (I for in-point, O for out-point) make precision editing even faster.
Yes! The tool is fully responsive and works on iOS and Android devices. However, exporting large video files on mobile may be slower due to hardware limitations. For best mobile experience, use short clips (under 2 minutes) and choose Medium or Low quality settings.
Exporting uses real-time playback recording (1× speed) to ensure high-quality output with synchronized audio. A 30-second clip takes approximately 30 seconds to export. This method preserves audio-video sync better than frame-by-frame canvas rendering. For longer clips, we recommend trimming in smaller segments.
Space — Play/Pause video | I — Set In point (start of clip) | O — Set Out point (end of clip) | ← → — Skip 1 second back/forward | Shift + ← → — Skip 5 seconds back/forward | Enter — Preview clip
There's no hard limit, but we recommend files under 2GB for smooth performance. Larger files may cause memory issues in the browser. If your video is very large, consider compressing it first or splitting it into smaller segments before trimming.
Element Screenshot Tool - Online Crop & Capture DOM Node
Select any HTML element on a page and capture its screenshot. Download as PNG. Perfect for bug reports. JavaScript API demo.
Pixelate Image Tool - Online Block & Censor Editor
Pixelate selected areas of an image to hide faces or sensitive data. Adjust block size. Download the censored result.
Canvas Compositing Demo - Online Blend & Clip Visual
Draw shapes and experiment with globalCompositeOperation. See Porter‑Duff operators in action. Great for game devs.
Web Page Screenshot Tool - Online Capture Browser Tab
Take a screenshot of the current browser tab using Screen Capture API. Crop, annotate with text and arrows, and download as PNG. Local only.
Cheese Curd Cutting Size Guide – Online Visual Cubes
Select cheese type (cheddar, brie) to see recommended curd cut size and visual cube comparison.
Drag & Drop File Upload Demo - Online With Preview
Drop files onto a zone and see a preview with name, size, and type. Copy the JavaScript pattern for your site.
Sewing Pattern Layout Optimizer - Online Minimize Waste
Place rectangular pattern pieces on a virtual fabric width to optimize cutting layout and reduce waste. Simple manual drag & drop. Local only.
W‑4 Withholding Estimator – Online Simple Tax Refund Checker
Enter income, pay frequency, and expected deductions to estimate your tax refund or balance due. Simplified model.
Nail Trim Scheduler for Small Pets – Online Calendar Alert
Set recurring reminders for nail trims based on species growth rate. Never forget.
CSS Mask Image Generator - Online Reveal Effects
Create CSS mask‑image effects with custom shapes, gradients, and SVGs. Visually see the mask applied to an image. Copy the CSS.
HTML Live Previewer - Online Code to Rendered View
Write or paste HTML, CSS, and JavaScript and instantly see the rendered output in a sandboxed iframe. A handy frontend prototyping tool.
Jigsaw Blade Selector – Online Material, Thickness & TPI Guide
Choose sawing material and thickness to get the correct blade type, TPI, and shank. Prevents burning and rough cuts.
Intersection Observer Sandbox - Online Visual Threshold
Adjust root, margin, and threshold. See a live log of intersection events as you scroll. Debug lazy loading.
HTML to Image Renderer - Online Capture DOM to Canvas
Paste HTML/CSS and render it to a canvas image. Download as PNG. For creating dynamic social share images.
Knitting Stitch Counter & Row Progress Tracker
Keep track of stitches and rows for your knitting projects. Multiple counters with increase/decrease shortcuts. Data saved in your browser.
Markdown Previewer - Online Live MD to HTML Renderer
Write Markdown and see the formatted HTML preview in real time. Syntax highlighting and GitHub-flavored Markdown support. No upload, fully local.
Yarn Substitution Tool – Online Match Gauge & Yardage
When a yarn is discontinued, find equivalent alternatives by matching weight and gauge. Local reference.
Fishing Knot Selector – Online Choose by Line & Lure Type
Answer simple questions (braid/mono, hook/swivel) to see the recommended fishing knot with step‑by‑step animation.
Web Animations API Sandbox - Online JS Animation Editor
Write JavaScript using element.animate() and see the result in a live preview. Compare with CSS keyframes. Debugger included.
Drag & Drop Order Tool - Online List Ranker
Reorder a list of items by dragging them. Paste a list, sort it by hand, and copy the new order. Simple.
Website Carbon Footprint Estimator - Online Eco Check
Enter a URL and get a rough estimate of its carbon emissions per page view. Based on data transfer size and energy model. Educational.
Daily Time Block Planner – Online Hourly Schedule
Divide your day into blocks with color codes. Drag tasks into slots. See free time at a glance.
Tarantula Molt Logger – Online Predict Next Shed
Log each molt date and size to predict the next ecdysis. Visual timeline. For the arachnid enthusiast.
Live Drawing Board - Online Freehand Sketch & Save
A beautiful full‑screen drawing canvas with variable brush sizes, colors, and an eraser. Export your sketch as PNG. All data stays local.
Brake Rotor Size Calculator - Online Car Maintenance
Enter your car's make and model to find the minimum and maximum rotor thickness specs. Static lookup table. Local reference.
Grocery Cost Estimator - Online Budget Your Weekly Cart
Build a virtual grocery list with estimated prices and see total before you shop. Adjust quantities, mark bought items. Data stays in browser.
Text to Line Array - Online Split for Code
Split text into a JavaScript or JSON string array. Wrap in quotes, add commas. Ready to paste into code.
Web Worker Heavy Task Demo - Online Non‑Blocking
Run a CPU‑heavy calculation (e.g., prime numbers) in a Web Worker and see the UI stay responsive. Code snippet provided.
WebGPU Bunny Demo - Online Simple 3D Renderer
Render the classic Stanford Bunny with a basic WebGPU pipeline. Rotate and zoom. Check if your browser supports WebGPU.