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55 calculators, converters and creative tools. Find the one for your next task.
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01Images & Documents
8 tools-
Base64 to PDF Viewer
Decode a Base64 string into a PDF you can preview and save. Source -
Gemini Watermark Remover
Clean the Gemini mark from an image on your device. Source -
Image Grid Splitter
Divide one image into evenly sized tiles for your next layout. Source -
Image Watermark Detector
Inspect images for hidden watermarks and C2PA content credentials. Source -
MMAP File Viewer
Explore MindManager maps and export their contents in your browser. Source -
Photo Grid Maker
Arrange two to sixteen photos into one collage. Source -
Photo Size Converter
Fit a photo to a target file size with local compression. Source -
Tax XML Viewer
Read Vietnamese tax declarations and electronic invoice XML files. Source
02Text & Code
8 tools-
Full-width Character Converter
Switch between full-width and half-width text and find mixed character widths. Source -
Git Commit History Viewer
Browse a GitHub repository's commit timeline and development activity. Source -
Invisible Character Detector
Find, inspect and replace hidden Unicode characters in text. Source -
ISSN Barcode Generator
Turn a journal's ISSN into an EAN-13 barcode for publication labels. Source -
Mexican RFC Generator
Create and validate example Mexican tax identifiers for testing. Source -
PDF417 Barcode Generator
Encode text as a PDF417 barcode, verify it and export the result. Source -
WhatsApp QR Code Generator
Link a QR code to your phone number and a prepared chat message. Source -
Wiegand Calculator
Encode or decode 26-bit H10301 access cards and check parity. Source
03Math & Science
6 tools-
3 × 2 Chi-square Test
Analyze a three-by-two contingency table with a chi-square test. Source -
Brachistochrone Trajectory Calculator
Estimate flip-and-burn travel time and peak velocity for space journeys. Source -
Cat Genetics Calculator
Explore possible coat colors and inherited traits from two parent cats. Source -
Open Babel Online Converter
Convert molecular and chemistry file formats in your browser. Source -
Paired T-Test Calculator
Compare related measurements with p-values, confidence intervals and effect sizes. Source -
Random Geographic Coordinates
Generate latitude and longitude points for maps, simulations and GIS work. Source
04Finance
4 tools-
Income-based Rent Split
Divide a shared rent payment in proportion to each person's income. Source -
Investment Crossover Calculator
Explore when portfolio growth overtakes contributions and supports your income goal. Source -
Investment Fee Calculator
Compare how fund, advisor and platform fees affect long-term balances. Source -
Portfolio Overlap Calculator
Uncover shared holdings and repeated exposure across funds and stocks. Source
05Engineering & Making
10 tools-
BMX Spoke Calculator
Find spoke lengths from your hub, rim and wheel-lacing measurements. Source -
Car Ramp Slope Calculator
Work out a ramp's slope and dimensions, including clearance considerations. Source -
Drywall Sheet Calculator
Estimate boards for a room with openings, sheet sizes and waste allowances. Source -
Freight Volume Calculator
Calculate shipping volume, weight and density from cargo dimensions. Source -
Gridfinity Generator
Customize printable storage bins and baseplates for a modular workspace. Source -
Living Hinge Generator
Design flexible cut patterns for laser-cut sheet material. Source -
Pond Calculator
Plan water volume, liner dimensions and pump flow for a pond. Source -
QR Code to STL Generator
Build a printable 3D QR code from text, links or QR images. Source -
Screen Burn Checker
Use solid-color test screens to inspect burn-in and pixel defects. Source -
Thermoelectric Cooler Calculator
Size a TEC system using cooling load, temperatures and module specifications. Source
06Web & Marketing
7 tools-
Bulk AI Traffic Checker
Explore website referrals and traffic attributed to AI platforms. Source -
Bulk Domain Checker
Look up domain registration status and expiration information in batches. Source -
Bulk Domain Rating Checker
Compare domain scores and export a sorted list of results. Source -
Bulk Google Suggestions
Collect search suggestions for a list of starting keywords. Source -
Bulk Traffic Checker
Review estimated website visits and traffic sources across domains. Source -
YouTube Thumbnail Checker
Preview thumbnail layouts and inspect dimensions and small-screen readability. Source -
YouTube Upload Time Calculator
Estimate upload duration and work backward from a publishing deadline. Source
07Learning & Play
10 tools-
Acrostic Puzzle Generator
Create quote-based word puzzles you can edit, check and print. Source -
Chinese Writing Grid Generator
Prepare printable writing sheets with grids for character practice. Source -
Chord Analysis Calculator
Identify possible chords from a collection of musical notes. Source -
College Graduation Calculator
Map your remaining credits and course load to a graduation timeline. Source -
Degree Percentage Calculator
Combine marks, credits and year weights to estimate a degree result. Source -
Google Arcade Point Calculator
Estimate Skills Arcade points and review progress toward reward levels. Source -
Minecraft Block Display Generator
Build Java Edition commands for custom block display entities. Source -
Minecraft Join Message Generator
Compose player arrival messages for your Minecraft server. Source -
Minecraft Stack Calculator
Convert item quantities into full stacks and leftover items. Source -
UC Transfer GPA Calculator
Calculate a transfer GPA from courses, units and grades. Source