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59 tools

Image aspect ratio fitter

Fit an image into a new aspect ratio without cropping, using colored padding. Download a PNG.

URL & subdomain sanitizer

Turn text into a URL-friendly slug, removing symbols and transliterating Turkish characters.

Net income for remote workers

Full-year 2026 estimate for a local employee with constant pay; excludes self-employment and cross-border tax treaties.

JSON formatter

Validate JSON and format it as readable, indented text. Your data stays in the browser.

APCA contrast tester

Measure perceptual contrast between text and background colors in APCA Lc. This is not a WCAG 2 pass/fail test.

SVG path compactor

Remove redundant whitespace from an SVG path string. Preserve the shape without rounding coordinates.

Cron schedule viewer

See the next five UTC runs of a five-field Cron expression. Searches within a one-year window.

Base64 text converter

Encode Unicode text to Base64 or decode Base64 back into text, entirely locally.

Custom Pomodoro cycle

Choose focus time, break time and repetitions to start your own focus timer.

CSS Grid generator

Turn column, row and gap values into a live grid preview and ready-to-use CSS.

Markdown table formatter

Convert tab-separated data into a Markdown table. The first row becomes the header.

Byte unit converter

Convert between bits, bytes and decimal or binary file-size units.

Password entropy estimate

Estimate theoretical entropy from the character pool. Assumes random selection; does not measure real password security.

Regex match inspector

Test a regular expression against text and inspect matches and positions. Long-running expressions are stopped.

Unix timestamp converter

Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.

HEX to RGBA mixer

Convert a HEX color and opacity percentage to CSS RGBA and preview the color.

URL query parser

Decode and list URL query parameters while preserving repeated keys.

HTML entity encoder

Convert special HTML characters to entities. The output is displayed as plain text.

Text diff checker

Compare two texts line by line, highlighting additions and deletions.

DMX patch planner

Allocate mixed lighting fixtures across universes without overlapping addresses.

Print sheet yield planner

Compare print layouts with bleed, margins and grain-direction rotation limits.

Time-lapse capture planner

Plan photo count, shooting duration and storage from a target clip.

IPv4 subnet split planner

Split a parent network into equal subnets with usable ranges and paged CSV output.

Preferment dough batch planner

Scale a bakery batch while separating preferment flour and water from the final mix.

Seed-lot sowing planner

Convert a target stand and measured seed-lot quality into kg/ha and total seed mass.

Bolt circle coordinate planner

Generate numbered X/Y centers for evenly spaced holes, with a diagram and CSV.

Roll stock length estimator

Estimate usable roll length, area and the shortage for a print job without unwinding.

Knife pleat marking planner

Fit existing fabric to a finished width and obtain every fold and matching mark.

Clay test shrinkage planner

Turn a measured test bar into the wet forming size for a finished ceramic piece.

Catch-can irrigation audit

Calculate lower-quarter uniformity, application rate and time to a target average depth.

Bellows exposure compensation

Calculate exposure time from bellows extension and additional filter stops.

Folio signature planner

Split a book into hand-binding signatures with page ranges and blank-page counts.

Mixed lumber volume tally

Total mixed rectangular lumber batches in board feet and cubic metres.

CNC milling feed planner

Convert tool diameter, cutting speed, tooth count and chip load into spindle RPM and table feed.

Sheet-metal bend flat planner

Calculate bend allowance, setback, deduction and flat length from shop dimensions.

Weld heat-input planner

Turn voltage, current, travel speed and process efficiency into arc and effective heat input.

HVAC superheat and subcooling worksheet

Calculate both temperature differences from four measured line and saturation temperatures.

Roller-chain length planner

Estimate chain pitches, choose a link count and recalculate the resulting centre distance.

Bakery water-temperature planner

Plan mixing-water temperature for a baker’s target dough temperature, with or without preferment.

Booklet creep worksheet

Give prepress operators per-sheet page shifts for a folded booklet signature.

Pack-constrained economic order quantity

Balance ordering and holding costs for an inventory buyer.

Paper basis-weight worksheet

Convert grammage and a specified basis ream into mass for print procurement.

Tempo delay-time table

Set timed effects for audio production using rhythmic note lengths.

PCM recording storage planner

Budget uncompressed audio payload for recording and archive sessions.

Cinema shutter exposure planner

Translate shutter angle into exposure time for camera crews.

Fixed-magnification field of view

Size the object field for machine-vision and macro-imaging setups.

Process capability index worksheet

Calculate Cp and Cpk from a quality engineer’s validated process statistics.

Contract dimensional-weight worksheet

Compare package mass with volume-based weight before carrier rounding.

Spotify playlist deep-link builder

Create a share link to a song with playlist context. For artists, curators and listeners.

Pattern-to-casting mass planner

Estimate metal charge from pattern mass and measured relative densities.

WhatsApp message link builder

Prepare a wa.me link with an international phone number and an optional message, without uploading contacts.

Centrifuge RCF and RPM worksheet

Convert a documented centrifugation setting using the actual rotor radius.

Dry sieve gradation worksheet

Summarize retained masses and mass closure for an unsplit dry sieve sample.

Beer–Lambert concentration worksheet

Calculate molar concentration from absorbance, known molar coefficient and optical path.

Sabine surface absorption worksheet

Estimate frequency-specific room reverberation from volume and documented surface absorption.

Yarn twist multiplier worksheet

This offline tool calculates the result from measured inputs. Yarn twist multiplier worksheet.

Vacuum-rise gas-load worksheet

This offline tool calculates the result from measured inputs. Vacuum-rise gas-load worksheet.

Rescue pledge reply builder

Rescue pledge reply builder. A deterministic worksheet using only entered values; it does not certify safety or compliance. No internet is needed after the page loads.

Recurring-post shortcode preview

Recurring-post shortcode preview. A deterministic worksheet using only entered values; it does not certify safety or compliance. No internet is needed after the page loads.