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Browse the tool catalog | Page 154

Search and filter the online tool directory by task, format, and category, then open detailed pages with clear inputs, examples, and execution context. Page 154.

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Math, Date & Finance586

Calculators, numerics, date logic, statistics, and finance tools

Images, Audio & Video564

Image, audio, and video processing, conversion, and optimization tools

Design & Color284

Color, layout, graphics, visual styling, and design helper tools

Text & Writing200

Writing, cleanup, formatting, extraction, and text analysis tools

Conversion & Encoding164

Format, file, archive, unit, and encoding conversion tools

Developer & Web161

Developer utilities, networking, web debugging, and automation helpers

Audio Encoding and Format Conversion Tools

Image Format Conversion and Animated Export Tools

JSON Interchange and Format Translation Tools

Color Space Conversion Tools for Web and Print

Text Case, Encoding, and Normalization Conversion Tools

Docs Pricing Terms of Service Privacy Policy Contact

Finance

Debt Payoff Calculator

General-purpose debt payoff planner comparing avalanche, snowball, and minimum-only strategies. Enter debts as 'name, balance, APR%, minPayment $' per line plus an extra monthly payment. Shows payoff time, total interest, savings, balance decline curves, and a per-debt repayment detail table.

Finance

Depreciation Calculator

Compare four depreciation methods side by side: straight-line, declining balance (with multiplier, e.g. 2 for DDB), sum-of-the-years'-digits (SYD), and units of production (when yearly usage is provided). Shows book-value curves and a year-by-year depreciation table.

Network

DNS Zone File Record Builder

Build RFC 1035 DNS zone files (SOA + NS/A/AAAA/CNAME/MX/TXT/SRV/CAA/TLSA/NAPTR/DS) with per-record validation and a readable summary.

Development

Email HTML Linter

Check email HTML templates for cross-client compatibility: unsupported CSS, non-inline styles, Outlook traps, table layout issues, and accessibility gaps.

Math & Numbers

Decibel Calculator (Power Ratio, Voltage Ratio, dBm/dBu/dBV)

Convert between ratios and decibels (10·log power, 20·log amplitude), and across absolute units dBm/dBW/dBV/dBu/dBFS/SIL

Math & Numbers

Doppler Effect Calculator (Frequency Shift)

Compute observed frequency and frequency shift for a moving source and/or observer

Math & Numbers

Density Calculator (ρ = m/V)

Compute density, mass, or volume from the other two, with specific gravity and a float/sink check

Design

ECharts Theme Token Extractor

Extract design tokens — colors, numbers, font sizes and strings — from an ECharts theme JSON and export them straight into your design system. Paste a theme object (the kind registered via echarts.init(dom, themeName)) and the tool walks every leaf, tagging each color (with optional named/rgb → hex normalization), spacing number, font size and string, then emits clean CSS variables, a Tailwind theme.extend config, Style Dictionary tokens.json, or SCSS variables. Bridges the gap between an ECharts visualization theme and Figma/CSS/Tailwind design tokens without copying each value by hand.

Security

Env File Secret Rotation Planner

Paste a .env file and get a staged secret-rotation plan. Detects database URLs, API keys, auth tokens, private keys, cloud credentials, payment keys and encryption secrets, scores each by exposure and age, and schedules them across a 4-week rotation timeline with a dual-key checklist and a generated .env.example. Optional last-rotated dates and a configurable cadence (30/90/180/365 days) drive compliance scoring.

Math & Numbers

Enzyme Kinetics Calculator (Michaelis-Menten)

Calculate reaction velocity with Michaelis-Menten, estimate Km/Vmax via Lineweaver-Burk, and model enzyme inhibition.

Security

Digital Signature Generator

Sign a message with a private key or verify a signature with a public key — supports RSA-PSS (SHA-256), ECDSA (P-256), and Ed25519. Pure client-side crypto (Node crypto.createSign/createVerify), no network. Paste a PEM key to sign or to verify a base64 signature. This tool signs/verifies; it does not generate key pairs.

Security

Entropy Calculator

Measure the randomness of any data — Shannon entropy (bits/symbol), Min-Entropy (worst-case guess work), alphabet size, duplicate rate, and an average brute-force cracking time at a chosen hash rate. Rates data as Strong (≥128-bit min-entropy), Medium (64-127), or Weak (<64).