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Browse the tool catalog | Page 79

Search and filter the online tool directory by task, format, and category, then open detailed pages with clear inputs, examples, and execution context. Page 79.

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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 & Encoding167

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

Developer & Web163

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

Design

RGB to HSV Converter

Convert RGB color values to HSV/HSB for color manipulation

Math & Numbers

Pint to Liter

Convert US liquid pints to liters with configurable decimal precision

Health

Pediatric Dose Calculator (Young / Clark / mg·kg⁻¹ / BSA)

Estimate a pediatric drug dose using one of four methods: (1) Young's rule (age-based) — Child dose = Adult dose × age / (age + 12); (2) Clark's rule (weight in pounds) — Child dose = Adult dose × weight(lb) / 150; (3) mg/kg per-weight regimen (the modern first-line method) — Child dose = dosePerKg × weight(kg); (4) BSA method (Mosteller) — Child dose = Adult dose × BSA_child / 1.73, with BSA = √(height·weight/3600). These are empirical approximations; modern practice prefers drug-specific mg/kg or mg/m² regimens derived from pediatric trials and verified against pediatric references and the approved labeling. Not medical advice.

Math & Numbers

Magnetic Permeability Converter (H/m ↔ relative μ_r)

Convert magnetic permeability (μ) between absolute permeability in henry per metre (H/m, SI unit; equivalently N/A² or T·m/A) and relative permeability μ_r (dimensionless). Vacuum permeability μ₀ = 4π×10⁻⁷ H/m ≈ 1.25663706×10⁻⁶ H/m (defined pre-2019; since the 2019 SI redefinition it is a measured quantity with relative uncertainty 1.6×10⁻¹⁰, so the 4π×10⁻⁷ form is still exact for all engineering purposes). Relations used: μ = μ_r × μ₀ and μ_r = μ / μ₀ (magnetic susceptibility χ_m = μ_r − 1). Reference: vacuum μ_r = 1, copper 0.999994 (diamagnetic), aluminum 1.000022 (paramagnetic), iron ≈ 5000 (ferromagnetic).

PDF Tools

PDF PAdES Certificate Signer

Sign PDFs with a PKCS#12 certificate using an ETSI CAdES detached signature.

PDF Tools

PDF Secure Redaction Sanitizer

Permanently remove PDF text and hidden page objects by rebuilding an image-only PDF.

Math & Numbers

Pipe Friction Factor Calculator (Colebrook-White / Haaland)

Compute the Darcy friction factor: laminar closed-form f=64/Re for Re<2000, or iterative Colebrook-White solution for transitional/turbulent flow, with the explicit Haaland approximation always returned as a cross-check. Reports relative roughness ε/D, absolute roughness (m), diameter (m), flow regime (laminar/transitional/turbulent), effective method and iteration count. Roughness ε in m/mm/µm, diameter D in m/cm/mm.

Math & Numbers

Pipe Pressure Drop Calculator (Darcy-Weisbach)

Compute the Darcy-Weisbach major (friction) pressure drop in a straight pipe: ΔP = f·(L/D)·(ρ·v²/2) Pa and head loss h_f = f·(L/D)·v²/(2g) m. The user supplies the Darcy friction factor f (not the Fanning factor). Length in m/km/ft, diameter in m/cm/mm/inch, density in kg/m³/g/cm³/lb/ft³ — all normalised to SI internally. Returns ΔP in Pa, kPa and bar, and head loss in m and ft. Gravity defaults to 9.81 m/s² and may be overridden.

Media

PNG to 16-bit PNG Converter

Store PNG pixels as true 16-bit-per-channel grayscale, 48-bit RGB, or 64-bit RGBA PNG.

Math & Numbers

pH Calculator

Convert between pH, [H+], pOH and [OH-], or compute pH from a strong acid/base concentration, including dilution.

Math & Numbers

Pendulum Period Calculator (T = 2π√(L/g))

Compute period, length, or gravity of a simple pendulum, plus amplitude-based peak speed and energy

Security

PKCE Code Verifier & Challenge Generator

Generate, validate and verify OAuth2 / OIDC PKCE (RFC 7636) code_verifier and S256 code_challenge pairs. Three modes: (1) generate a fresh verifier + challenge from cryptographically secure random bytes at 256/384/512/768-bit entropy, (2) audit a verifier you already have against the RFC — length (43–128), charset [A-Za-z0-9-._~] and ≥256-bit entropy, and (3) verify a verifier/challenge pair by recomputing BASE64URL(SHA256(verifier)). Optionally build the full authorization-request URL and token-exchange body. Complements the generic nonce-generator (which only emits a verifier+challenge pair) with RFC-compliance auditing and pair verification.