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• Duplicate Line Finder

  Find duplicate lines in text, see occurrence counts and line numbers, and copy a cleaned list. Choose case and whitespace options.

• Compare Text Online

  Compare two texts by line position or find values present in only one list. Extra duplicate occurrences are included in the comparison.

• JSON Formatter and Validator

  Validate JSON syntax, format with two or four spaces, or minify it for copying and downloading. Works with pasted JSON in your browser.

• SQL IN List Builder

  Convert a list of lines into a SQL IN (...) fragment. Quote text safely for the fragment, preserve leading zeros or select numeric values.

• CSV Viewer & Editor

  View and edit CSV cells in a local table, then export changes.

• TSV ↔ CSV Converter

  Convert tab-separated and comma-separated tables with proper quoting.

• Percentage Calculator

  Calculate a percentage of a value.

• Percentage Change Calculator

  Calculate the percentage change from an old value to a new value.

• Length Converter

  Convert length using explicit source and destination units.

• Weight Converter

  Convert weight using explicit source and destination units.

• Date Difference Calculator

  Count calendar days between two dates; time zones do not affect the result.

• Add / Subtract Days from a Date

  Move a calendar date forward or backward by whole days.

• Image Resizer

  Resize raster images while keeping aspect ratio or using exact dimensions.

• Image Compressor

  Export a raster image as JPEG or WebP at your chosen quality.

• Password Generator

  Generate passwords using cryptographic randomness with selected character sets.

• Random Number Generator

  Generate uniformly distributed random integers without predictable seeds.

• Gross ↔ Net Salary Calculator

  Albania 2026 payroll preset, plus a custom effective-rate estimator for 50 country/currency selections.

• Merge PDF Files

  Merge PDFs in the listed selection order, locally in your browser.

• Split PDF / Extract Pages

  Save selected PDF pages as a new PDF using page numbers and ranges.

• Average Acceleration Calculator

  Use this online average acceleration calculator with labeled inputs and a worked example. a = (v − u) / t.

• Constant Acceleration Displacement Calculator

  Use this online constant acceleration displacement calculator with labeled inputs and a worked example. s = ut + at²/2; v = u + at.

• Chemical Formula Molar Mass Calculator

  Use this online chemical formula molar mass calculator with labeled inputs and a worked example. M = Σ(atomic weight × atom count).

• Element Mass Percent Composition Calculator

  Use this online element mass percent composition calculator with labeled inputs and a worked example. element mass % = element mass contribution / molar mass × 100.

• IPv4 CIDR Aggregator

  Use this online ipv4 cidr aggregator with pasted values. Exact union only; never fills gaps between ranges.

• IPv4 Range to CIDR Blocks

  Use this online ipv4 range to cidr blocks with pasted values. Returns the smallest exact CIDR cover of the supplied inclusive address interval.

• Extended Euclidean Algorithm Calculator

  Online extended euclidean algorithm calculator. Returns Bézout coefficients for nonnegative integers with positive second input.

• Modular Multiplicative Inverse Calculator

  Online modular multiplicative inverse calculator. Requires coprime inputs and modulus at least two.

• LED Series Resistor Sizing Calculator

  Online led series resistor sizing calculator. Single ideal LED with supplied forward voltage; choose component tolerances separately.

• Series LED String Resistor Calculator

  Online series led string resistor calculator. Identical series LEDs; supply must exceed combined forward drop.

• Roof Pitch Angle and Slope Factor

  Online roof pitch angle and slope factor. Material-planning geometry only. Supplied dimensions and productivity are scenarios; no structural capacity or building-code compliance is determined.

• Gable Roof Covering Quantity

  Online gable roof covering quantity. Material-planning geometry only. Supplied dimensions and productivity are scenarios; no structural capacity or building-code compliance is determined.

• Metric Tire Diameter and Sidewall Calculator

  Online metric tire diameter and sidewall calculator. Idealized vehicle-system arithmetic using supplied measurements. This does not establish component suitability, safe modifications or actual performance.

• Tire Revolutions per Kilometer

  Online tire revolutions per kilometer. Idealized vehicle-system arithmetic using supplied measurements. This does not establish component suitability, safe modifications or actual performance.

• Telescope Eyepiece Magnification Calculator

  Online telescope eyepiece magnification calculator. Idealized astronomical model with displayed units. Seeing, extinction, instrument losses or cosmological effects apply only when explicitly included.

• Telescope Exit Pupil Calculator

  Online telescope exit pupil calculator. Idealized astronomical model with displayed units. Seeing, extinction, instrument losses or cosmological effects apply only when explicitly included.

• Tempo Note Delay Chart Calculator

  Online tempo note delay chart calculator. Ideal mathematical audio model with supplied values. Real speakers, rooms, hearing exposure and converter performance are not measured.

• Musical Bars Duration Calculator

  Online musical bars duration calculator. Ideal mathematical audio model with supplied values. Real speakers, rooms, hearing exposure and converter performance are not measured.

• Exposure Stop Difference Calculator

  Online exposure stop difference calculator. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.

• Aperture Exposure Compensation

  Online aperture exposure compensation. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.

• Required Final Exam Score Calculator

  Online required final exam score calculator. May exceed 100 percent, indicating an unattainable target under the supplied weights.

• Grade Average After Dropping Lowest Score

  Online grade average after dropping lowest score. User-supplied grading or study-plan assumptions; school rules and personal learning outcomes are not inferred.

• Stacked Percentage Coupon Calculator

  Online stacked percentage coupon calculator. Illustrative operating scenario using supplied costs and rates. Taxes, legal entitlements and current platform fee schedules are not inferred.

• Fixed Coupon Effective Discount

  Online fixed coupon effective discount. Illustrative operating scenario using supplied costs and rates. Taxes, legal entitlements and current platform fee schedules are not inferred.

• Rectangular Plant Spacing Quantity

  Online rectangular plant spacing quantity. Planning estimate using supplied crop, soil or material parameters. Growth, weather and application suitability are not predicted.

• Triangular Planting Density Estimate

  Online triangular planting density estimate. Infinite triangular-grid area approximation; boundary losses excluded.

• Electricity Emissions with Supplied Grid Factor

  Online electricity emissions with supplied grid factor. Factor is an illustrative input, not a verified local grid value.

• Travel Emissions Scenario per Passenger

  Online travel emissions scenario per passenger. User-supplied vehicle factor and allocation; lifecycle boundary is not inferred.

• Great Circle Initial Bearing Calculator

  Online great circle initial bearing calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.

• Great Circle Arrival Bearing Calculator

  Online great circle arrival bearing calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.

• Seeded Knockout Bracket Generator

  Online seeded knockout bracket generator. Single elimination only. Seed order is the input order; no winners are predicted or scores stored.

• Round Robin Fixture Generator

  Online round robin fixture generator. 2–64 unique entrants. Round labels are pairings, not dated venue allocations.

• Two Link Robot Forward Kinematics

  Online two link robot forward kinematics. Planar revolute joints; second angle is relative to the first link.

• Two Link Robot Inverse Kinematics

  Online two link robot inverse kinematics. Both elbow branches; singular folded origin is rejected.

• Uniform Print Shrinkage Compensation

  Online uniform print shrinkage compensation. Geometric or extrusion estimate; printer behavior and material properties must be measured. Example values are not recommended machine settings.

• Print Layer Count with First Layer

  Online print layer count with first layer. Geometric or extrusion estimate; printer behavior and material properties must be measured. Example values are not recommended machine settings.

• Dough Hydration Including Preferment

  Online dough hydration including preferment. Mass-balance or geometry model with the stated convention. No cooking safety, fermentation time, dietary suitability or preservation method is prescribed.

• Bakers Percentage Ingredient Calculator

  Online bakers percentage ingredient calculator. Flour mass is the 100 percent reference.

• Knitting Stitch Gauge Rescaling

  Online knitting stitch gauge rescaling. Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.

• Knitting Row Count for Target Length

  Online knitting row count for target length. Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.

• Print Trim and Bleed Dimensions

  Online print trim and bleed dimensions. Nominal print or packaging geometry with explicit units. Confirm press, stock, binding and production tolerances with the actual supplier.

• Print Safe Area Inside Trim

  Online print safe area inside trim. Nominal print or packaging geometry with explicit units. Confirm press, stock, binding and production tolerances with the actual supplier.

• Uniaxial Engineering Stress Calculator

  Online uniaxial engineering stress calculator. Idealized linear material model where stated; no failure assessment, allowable stress, structural certification or compliance calculation is provided.

• Uniaxial Engineering Strain Calculator

  Online uniaxial engineering strain calculator. Idealized linear material model where stated; no failure assessment, allowable stress, structural certification or compliance calculation is provided.

• Milling Table Feed from Chip Load

  Online milling table feed from chip load. Ideal machining arithmetic. Supplied cutting data are illustrative, and tool limits, workholding, machine protection and real cycle behavior require independent review.

• Peck Drilling Cycle Time Estimate

  Online peck drilling cycle time estimate. Supplied fixed overhead per intermediate peck; controller motion details excluded.

• Sudoku Grid Checker

  Online sudoku grid checker. A conflict-free incomplete grid is not necessarily solvable.

• Sudoku Solver and Uniqueness Check

  Online sudoku solver and uniqueness check. A node-limit result reports unknown uniqueness rather than asserting a unique solution.

• Numbered Guest Table Assignment Planner

  Online numbered guest table assignment planner. Assigns guest numbers consecutively, without family or preference constraints.

• Round Banquet Table Footprint Estimate

  Online round banquet table footprint estimate. Square planning cells; aisles and venue restrictions need separate review.