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Image aspect ratio fitter
Fit an image into a new aspect ratio without cropping, using colored padding. Download a PNG.
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URL & subdomain sanitizer
Turn text into a URL-friendly slug, removing symbols and transliterating Turkish characters.
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Net income for remote workers
Full-year 2026 estimate for a local employee with constant pay; excludes self-employment and cross-border tax treaties.
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JSON formatter
Validate JSON and format it as readable, indented text. Your data stays in the browser.
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APCA contrast tester
Measure perceptual contrast between text and background colors in APCA Lc. This is not a WCAG 2 pass/fail test.
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SVG path compactor
Remove redundant whitespace from an SVG path string. Preserve the shape without rounding coordinates.
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Cron schedule viewer
See the next five UTC runs of a five-field Cron expression. Searches within a one-year window.
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Base64 text converter
Encode Unicode text to Base64 or decode Base64 back into text, entirely locally.
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Custom Pomodoro cycle
Choose focus time, break time and repetitions to start your own focus timer.
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CSS Grid generator
Turn column, row and gap values into a live grid preview and ready-to-use CSS.
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Markdown table formatter
Convert tab-separated data into a Markdown table. The first row becomes the header.
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Byte unit converter
Convert between bits, bytes and decimal or binary file-size units.
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Password entropy estimate
Estimate theoretical entropy from the character pool. Assumes random selection; does not measure real password security.
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Regex match inspector
Test a regular expression against text and inspect matches and positions. Long-running expressions are stopped.
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Unix timestamp converter
Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.
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HEX to RGBA mixer
Convert a HEX color and opacity percentage to CSS RGBA and preview the color.
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URL query parser
Decode and list URL query parameters while preserving repeated keys.
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HTML entity encoder
Convert special HTML characters to entities. The output is displayed as plain text.
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Text diff checker
Compare two texts line by line, highlighting additions and deletions.
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DMX patch planner
Allocate mixed lighting fixtures across universes without overlapping addresses.
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Print sheet yield planner
Compare print layouts with bleed, margins and grain-direction rotation limits.
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Time-lapse capture planner
Plan photo count, shooting duration and storage from a target clip.
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IPv4 subnet split planner
Split a parent network into equal subnets with usable ranges and paged CSV output.
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Preferment dough batch planner
Scale a bakery batch while separating preferment flour and water from the final mix.
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Seed-lot sowing planner
Convert a target stand and measured seed-lot quality into kg/ha and total seed mass.
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Bolt circle coordinate planner
Generate numbered X/Y centers for evenly spaced holes, with a diagram and CSV.
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Roll stock length estimator
Estimate usable roll length, area and the shortage for a print job without unwinding.
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Knife pleat marking planner
Fit existing fabric to a finished width and obtain every fold and matching mark.
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Clay test shrinkage planner
Turn a measured test bar into the wet forming size for a finished ceramic piece.
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Catch-can irrigation audit
Calculate lower-quarter uniformity, application rate and time to a target average depth.
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Bellows exposure compensation
Calculate exposure time from bellows extension and additional filter stops.
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Folio signature planner
Split a book into hand-binding signatures with page ranges and blank-page counts.
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Mixed lumber volume tally
Total mixed rectangular lumber batches in board feet and cubic metres.
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CNC milling feed planner
Convert tool diameter, cutting speed, tooth count and chip load into spindle RPM and table feed.
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Sheet-metal bend flat planner
Calculate bend allowance, setback, deduction and flat length from shop dimensions.
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Weld heat-input planner
Turn voltage, current, travel speed and process efficiency into arc and effective heat input.
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HVAC superheat and subcooling worksheet
Calculate both temperature differences from four measured line and saturation temperatures.
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Roller-chain length planner
Estimate chain pitches, choose a link count and recalculate the resulting centre distance.
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Bakery water-temperature planner
Plan mixing-water temperature for a baker’s target dough temperature, with or without preferment.
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Booklet creep worksheet
Give prepress operators per-sheet page shifts for a folded booklet signature.
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Pack-constrained economic order quantity
Balance ordering and holding costs for an inventory buyer.
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Paper basis-weight worksheet
Convert grammage and a specified basis ream into mass for print procurement.
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Tempo delay-time table
Set timed effects for audio production using rhythmic note lengths.
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PCM recording storage planner
Budget uncompressed audio payload for recording and archive sessions.
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Cinema shutter exposure planner
Translate shutter angle into exposure time for camera crews.
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Fixed-magnification field of view
Size the object field for machine-vision and macro-imaging setups.
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Process capability index worksheet
Calculate Cp and Cpk from a quality engineer’s validated process statistics.
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Contract dimensional-weight worksheet
Compare package mass with volume-based weight before carrier rounding.
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Pattern-to-casting mass planner
Estimate metal charge from pattern mass and measured relative densities.
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Centrifuge RCF and RPM worksheet
Convert a documented centrifugation setting using the actual rotor radius.
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Dry sieve gradation worksheet
Summarize retained masses and mass closure for an unsplit dry sieve sample.
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Beer–Lambert concentration worksheet
Calculate molar concentration from absorbance, known molar coefficient and optical path.
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Sabine surface absorption worksheet
Estimate frequency-specific room reverberation from volume and documented surface absorption.
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Yarn twist multiplier worksheet
This offline tool calculates the result from measured inputs. Yarn twist multiplier worksheet.
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Vacuum-rise gas-load worksheet
This offline tool calculates the result from measured inputs. Vacuum-rise gas-load worksheet.
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