UD5 Toolkit
Chess Position Editor - Online Setup Board & Export FEN
Drag and drop pieces to set up a chess position. Generate FEN string and copy to share. Analyze openings. Local only.
Tag: Editor - Code, Text & Data
15+ toolsCSS Filter Visual Editor - Online Apply & Chain Filters
Add multiple CSS filters (grayscale, blur, hue‑rotate) to an image. See the combined effect. Copy the CSS filter value.
Image Auto Crop Tool - Online Remove White Borders
Automatically crop transparent or solid‑color borders from any image. Just drop the photo and get the tight crop.
Markdown Diff Viewer - Online Compare & Highlight Markdown
Paste two Markdown texts and see a side‑by‑side diff with rendered preview. Perfect for editing and collaboration.
Online Video Trimmer - Cut & Save Clips Locally
Set start and end times for a video and trim it without re-encoding. Download the clip. Pure browser.
Local JSON Data Explorer - Online Browser Storage Viewer
View, edit, and manage JSON objects saved in your browser's localStorage. Delete, export, or import keys. No setup.
Simple Audio Waveform Cutter - Online Trim & Loop
Load an audio file and visually trim it by dragging handles on the waveform. Export the trimmed clip. All local.
CSS Paint Worklet Live Editor - Online Houdini Sandbox
Write a paint worklet in JavaScript and see it used as a CSS background instantly. Experiment with Houdini. Local.
Image Padding Tool - Online Add White Space Around Photo
Add customizable padding to any image. Make it square or fit a specific aspect ratio by adding whitespace. Download padded PNG.
Proofreading Marks Reference - Online Editors' Cheat Sheet
A visual guide to common copy‑editing and proofreading symbols. Click a mark to see its meaning. For writers.
Audio Trimmer - Online Cut MP3 WAV Locally
Select a part of an audio file and trim it to the selection. Playback preview. Download the cropped audio. No upload.
Audio Silence Remover - Online Strip Quiet Parts
Remove silent parts from an audio recording. Useful for podcasts and lectures. Set threshold and minimum silence duration.
CSV Viewer & Editor - Online Spreadsheet Tool
View and edit CSV data in a familiar table interface. Add/delete rows and columns, sort, and export. Fully local, no cloud sync.
Image Round Corners - Online Add Border Radius Smoothly
Apply a precise rounded corner effect to an image by cropping with a mask. Download as transparent PNG. All local.
Crontab Expression Editor - Online Interactive Cron Builder
Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.