Categories
Explore all tool categories on otoUP
Calculators
Essential calculators for everyday, financial, and math calculations.
0 ToolsFinance & Money
Loans, mortgage, interest, savings, investment, and taxes.
38 ToolsMath & Algebra
Formulas, geometry, fractions, algebra, and statistics.
62 ToolsHealth & Fitness
BMI, calories, body fat, water intake, heart rate, and workouts.
30 ToolsDate & Time
Date differences, duration, business days, epoch, and world clocks.
28 ToolsAge & Birthday
Detailed age calculator, milestones, countdowns, and zodiacs.
15 ToolsConverters
Convert between hundreds of measurement units and metrics.
8 ToolsPercentage Tools
Percentage increase, decrease, fraction, and difference calculations.
11 ToolsBusiness & Sales
Profit margin, markup, breakeven, pricing, and sales tax.
26 ToolsText Tools
Case conversion, word counts, formatting, cleaning, and text diff.
37 ToolsWriting & Content
Readability, character counters, lorem ipsum, and typography.
5 ToolsDeveloper Tools
Code formatters, minifiers, regex, hashes, encoding, and JWT.
16 ToolsWeb & Internet
URL parsers, meta tags, HTTP codes, user-agents, and headers.
5 ToolsSEO & Marketing
Meta generators, robots.txt, sitemaps, UTM tags, SERP preview.
18 ToolsImage Tools
Image resizing, compression, cropping, base64, and conversion.
16 ToolsPDF Utilities
Client-side PDF page counter, text extractors, and print helpers.
7 ToolsFile Tools
File hash verification, checksums, mime types, and size calculator.
3 ToolsSecurity & Privacy
Password generators, entropy testers, IP subnet, and cryptography.
9 ToolsPassword Tools
Secure password generators, PIN makers, and strength evaluators.
5 ToolsColor Tools
HEX, RGB, HSL, CMYK converters, color pickers, and palettes.
12 ToolsCSS Generators
Box shadow, gradient, flexbox, border radius, and glassmorphism.
11 ToolsHTML Tools
HTML entity encoder/decoder, table generators, tags cleaner.
5 ToolsJSON Tools
JSON formatters, validators, minifiers, JSON to CSV/XML/YAML.
6 ToolsXML Tools
XML formatter, validator, XML to JSON, and entity escaper.
3 ToolsCSV Tools
CSV to JSON, JSON to CSV, TSV converter, delimiter changer.
5 ToolsUnit Converters
Comprehensive unit conversions for length, mass, volume, pressure.
71 ToolsTime Zone Tools
Time zone conversions, UTC offsets, and world meeting planner.
2 ToolsEducation & Learning
GPA calculators, grade calculators, flashcards, periodic table.
6 ToolsStudent Tools
Weighted grades, final exam score calculators, study timers.
5 ToolsRandom Generators
Random numbers, dice roller, coin flipper, lottery numbers, names.
8 ToolsGenerators
UUID, QR codes, barcodes, fake names, usernames, and dummy data.
11 ToolsProductivity Tools
Pomodoro timer, checklist maker, task countdown, habit trackers.
3 ToolsSocial Media Tools
Hashtag makers, bio link helpers, post character counters.
6 ToolsMarketing Tools
UTM builders, CTR calculators, CPM/CPC calculators, ROI.
9 ToolsYouTube Tools
Tag extractors, title ideas, thumbnail grabbers, embed generator.
3 ToolsImage & Graphic Tools
Favicon generators, aspect ratio tools, SVG placeholder makers.
3 ToolsData & Statistics
Mean, median, mode, standard deviation, z-score, variance.
13 ToolsNetwork & IP Tools
IP lookup, subnet mask calculator, CIDR, port reference, MAC.
2 ToolsEncoding Tools
Base64, URL, HTML, Binary, Hex, ASCII, ROT13, Morse encoders.
15 ToolsDecoding Tools
Base64, URL, HTML, Binary, Hex, ASCII, ROT13, Morse decoders.
10 ToolsUtility & Everyday
Fuel cost, electricity cost, tip split, decision wheel.
4 ToolsAudio & Media
BPM tapper, audio frequency, decibel converter, audio tools.
2 Tools