Random Number Generator
Generate integers in a chosen range and copy the result.
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Bird Nest Toolbox
Small tools for quick everyday moments. Lightweight, tidy, and ready when you open them.
A quick look at today
Today's place in the year, one useful tool, and a few events from this day in history.
Common picks
All tools
42 results
Dice Roller
Change dice count and sides for board games or quick choices.
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Coin Flipper
Flip one or many coins when you need a quick either-or.
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Decision Coin
Flip a fixed YES / NO coin to answer one question.
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Lucky Draw
Paste a list and randomly pick one or more options.
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Custom Wheel
Put options on a wheel and spin to pick one.
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Password Generator
Generate passwords for signups or temporary credentials.
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Word Counter
Count characters, words, lines, and paragraphs in real time.
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JSON Formatter
Format, minify, and validate JSON content.
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Color Converter
Convert between HEX, RGB, HSL, HSV, and related formats.
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DR Lookup
Enter a domain and query Ahrefs Domain Rating.
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Image Resize & Compress
Resize images and export compressed results.
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Image Crop
Crop images by pixel range or common aspect ratios.
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Image Format Converter
Convert between JPEG, PNG, WebP, and related formats.
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Timer
Stopwatch and countdown in one lightweight panel.
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Metronome
Set tempo and beats per bar with a crisp click for rhythm practice.
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Date Calculator
Calculate date gaps or move a date forward/backward.
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Kinship Calculator
Trace a relative chain and find common Chinese kinship terms.
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Unit Converter
Convert length, weight, time, speed, data storage, and more.
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BMI Calculator
Enter height and weight to estimate body mass index.
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Reaction Test
Wait for the color change, then click to measure reaction speed.
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Big Five Personality Test
Explore five personality dimensions with 50 IPIP items.
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Cognitive Challenge
Practice pattern reasoning, spatial observation, and digit memory.
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Schulte Grid
Tap numbers in order to practice attention and visual search.
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Markdown Editor
Edit and preview Markdown, then download it locally.
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Images to PDF
Order multiple images and combine them into one PDF.
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Handheld Banner
Show scrolling or still text fullscreen with adjustable speed.
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PDF Organizer
Reorder, rotate, and remove PDF pages.
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Merge PDF Files
Combine multiple PDFs in the order you choose.
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Base Converter
Convert integers between bases 2 and 36.
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Currency Converter
Convert common currencies using reference rates.
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Barcode / QR Generator
Generate downloadable QR codes and common barcodes.
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Linux Command Lookup
Search common Linux commands, uses, and examples.
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Size Conversion Chart
Compare regional clothing, pants, and shoe sizes.
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IP Location Lookup
Look up an IP's approximate region, network, and timezone.
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Mobile Number Attribution
Look up the original region and carrier of a mainland China mobile number.
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Drawing Board
A lightweight canvas for touch, stylus, and mouse input.
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Scoreboard
Keep scores for two to four teams.
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MD5 Digest
Calculate an MD5 digest for text or files locally.
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Compass
Read the current heading from a mobile orientation sensor.
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Bubble Level
Estimate surface tilt using device orientation.
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Noise Meter
Observe relative sound levels without recording audio.
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