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🖼️ ImagesFree
Hex to RGB converter
Read any hex code as plain numbers: #3498db is red 52, green 152 and blue 219, because each pair of digits is a base-16 number, ready to paste as rgb(52, 152…
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HSL to HSV converter
Switch a color between the designer's HSL and the image editor's HSV: hsl(210, 80%, 45%) keeps hue 210 and becomes value 81%, with saturation recalculated for…
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HSL to RGB converter
Turn three HSL numbers into the channels a screen uses: hue 210, saturation 80% and lightness 45% give rgb(23, 115, 207), which is #1773cf in hex, using the…
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HSV to RGB converter
Turn an HSV pick into screen channels: hue 210, saturation 70% and value 80% give rgb(61, 133, 204), or #3d85cc, using the classic six-sector formula.
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Color lightener
Lightening #3366cc by 20 % gives #5c85d6: lightness rises from 50 % to 60 % while the blue keeps its hue and saturation.
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Color mixer
Mixing #FF0000 and #0000FF at 50 % gives #800080, a purple with red 128, green 0 and blue 128. Make brand mid-tones and hover shades from two colors you already…
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CSS color name to hex
The CSS color name tomato is #ff6347, or rgb(255, 99, 71), the exact shade every browser paints. Turn color names from a style guide or brand deck into hex…
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RGB to HSL converter
See any RGB color as hue, saturation and lightness: 255, 128, 64 becomes 20.1°, 100 % and 62.55 %. Adjust tone or build light and dark themes without guessing.
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RGB to decimal integer
Store a color as one whole number, or read one back: #FF8000 is 16744448. Red takes the high byte, green the middle and blue the low, the layout many engines…
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Color shades generator
Build a full light-to-dark ladder from one brand color, for example #3366cc with three steps, which gives seven swatches from #000000 through #224488 and the…
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Triadic color scheme generator
Enter #3498db and get its triadic partners #db3498 and #98db34, three hues set 120 degrees apart so none dominates.
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➗ MathFree
Combinations calculator
Find how many ways you can choose items when order does not matter: any 3 of 10 books for a weekend bag give 120 different bags, C(10,3), and the result stays…
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➗ MathFree
Integer compositions calculator
Count every ordered way to split a whole number into positive parts: 5 has 16 compositions and 4 has 8, because 1+3 and 3+1 count separately.
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➗ MathFree
Derangement calculator
Count the shuffles in which nothing stays in its original spot: 5 people drawing names for secret Santa have 44 draws where nobody gets themselves, which is !5.
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➗ MathFree
Multinomial coefficient calculator
Count the ways to split items into named groups of set sizes: 6 people placed into three labeled groups of 2 can be arranged in 90 ways, exactly 6! divided by…
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➗ MathFree
Integer partition calculator
Count the ways to write a whole number as a sum when order does not matter: 4 splits into 4, 3+1, 2+2, 2+1+1 and 1+1+1+1, so p(4) is 5, and 5 has 7.
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➗ MathFree
Pascal's triangle generator
Ask for 5 rows and get Pascal's triangle down to 1, 4, 6, 4, 1: fifteen exact numbers in which each entry is the sum of the two above it.
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➗ MathFree
Permutations calculator
Count arrangements where order matters: 3 of 5 runners can take first, second and third place in 60 ways, P(5,3), because ABC and ACB are different finishes.
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➗ MathFree
Permutations with repetition
Count ordered sequences when symbols may repeat: 5 symbols across 3 positions give 125 possibilities, 5^3, the same product rule behind codes and password…
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Round-robin matches calculator
Plan a league where everyone meets once: 8 teams need 28 games over 7 rounds with 4 games per round, while 5 teams need 10 games over 5 rounds.
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Stirling numbers of the second kind
Count the ways to split items into unnamed, non-empty groups: 5 people form 2 such teams in 15 ways and 3 teams in 25 ways, S(5,2) and S(5,3).
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📏 Unit convertersFree
Acres to square meters converter
One international acre is exactly 4,046.8564224 square metres. The converter multiplies your acreage by that full figure, not the rounded 4,047, so imperial…
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Physical action converter
1 joule-second is 10,000,000 erg-seconds. This converter moves physical action between J·s, eV·s, erg·s, N·m·s and the Planck constants h and ħ, and shows each…
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Water alkalinity converter
One dKH from an aquarium test kit equals 17.848 mg/L as calcium carbonate. The converter moves alkalinity between eight units, including meq/L, ppm, French and…
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Angular momentum converter
1 kg·m²/s is 10,000,000 g·cm²/s. The converter moves angular momentum between six units, from joule-seconds and newton-metre-seconds to erg-seconds and pound…
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API gravity converter
A 35-degree crude has a specific gravity of 0.84984984985 and a density of 849.013597597598 kg/m³.
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ATM to PSI converter
1 atm is 14.695948775513 psi, not a rounded 14.7. This converter turns standard-atmosphere readings from textbooks or European data sheets into the pounds per…
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📏 Unit convertersFree
Beaufort scale converter
Force 5, a fresh breeze, is 18.168656007245 knots. Convert wind between the Beaufort scale and knots, mph, m/s, km/h or ft/s in either direction, with the…
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📏 Unit convertersFree
Belt size converter
A 34-inch waist takes a size 36 belt: the belt number runs two inches above the waist so the buckle closes on the middle hole.
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📏 Unit convertersFree
Binary prefix converter
1 MiB is 1.048576 MB, not 1 MB: the converter keeps kibi, mebi and gibi apart from kilo, mega and giga with exact powers of two and ten, so a disk label and a…
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📏 Unit convertersFree
BTU to kWh converter
One BTU is 0.00029307107 kWh, worked out from the exact International Table definition rather than a rounded rule of thumb.
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Calories to joules converter
One calorie is exactly 4.184 joules under the thermochemical definition, the constant chemistry and thermodynamics courses expect.
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Calorific value converter
38 MJ/m³ of pipeline gas is just under one thousand twenty BTU per cubic foot. Switch any calorific value among seven volume-based units used in gas contracts…
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📏 Unit convertersFree
CM to inches converter
2.54 cm is exactly one inch, so the converter divides your centimeters by 2.54 and shows each step, ready to check clothing size charts, DIY cut lists or…
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📏 Unit convertersFree
Color depth converter
24 bits per pixel give 16,777,216 colors: convert color depth between bits per pixel, number of colors, bits per channel, bytes per pixel and levels per…
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📏 Unit convertersFree
Cubic meters to cubic feet converter
1 cubic meter is about 35.314666721489 cubic feet: convert metric volumes from SI drawings and tank specs into the cubic feet printed on US HVAC plates, crate…
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📏 Unit convertersFree
Degrees to gradians converter
A right angle of 90° is exactly 100 gradians. Enter degrees and get gons with the exact ten-ninths factor, anchored on a full turn of 360° being 400 gradians…
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Didot point converter
12 Didot points, one cicero, measure 4.512 mm. Convert between Didot points, ciceros, millimetres, centimetres, PostScript points, picas and inches, so a…
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📏 Unit convertersFree
Electric flux converter
One statvolt centimetre equals 2.99792458 volt metres. Convert electric flux between V·m, N·m²/C, kilovolt and millivolt metres, C/ε₀ and statV·cm, for…
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📏 Unit convertersFree
Electron mobility converter
1400 cm²/(V·s), roughly the electron mobility of silicon, is 0.14 m²/(V·s). Convert carrier mobility between square metres, centimetres and millimetres per volt…
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Entropy converter
One calorie per kelvin is exactly 4.184 joules per kelvin. Convert entropy between joules, kilojoules, calories and kilocalories per kelvin, BTU per Rankine and…
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📏 Unit convertersFree
Equivalent weight converter
Switch a chemical equivalent weight between eight units in one step: 49.04 g/eq reads as 49.04 mg/meq, and 1 kg/eq is exactly 1000 g/eq.
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Fabric weight converter
Read a fabric weight on the scale your supplier or customer uses: 200 gsm is 5.898704936329 oz/yd², with exact ounce, pound, yard and foot definitions across…
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📏 Unit convertersFree
Fahrenheit to Rankine converter
Move a Fahrenheit reading onto the absolute Rankine scale by adding exactly 459.67: water's freezing point, 32 °F, becomes 491.67 °R.
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📏 Unit convertersFree
Film speed converter
Read any film speed on the scale you need: ISO 100 film is 21 DIN, still 100 in ASA and Sv 5 in APEX terms, with GOST covered too.
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Foot-pounds to newton-meters converter
Turn a foot-pound torque or work figure into SI newton-meters with the full exact constant: 10 ft·lbf is about 13.56 N·m, with no truncated shortcut creeping…
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Gallons to cups converter
One US liquid gallon is exactly 16 cups, so 2.5 gallons come out as 40 cups with no rounding guesswork.
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Gallons to quarts converter
Every US liquid gallon splits into exactly 4 quarts, so 2.5 gallons are 10 quarts. Useful when a tank, a jug or a bulk recipe is measured in gallons but the…
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Glove size converter
A hand measuring 20.3 cm around the knuckles is about 8 inches, which is glove size 8, a medium. Enter centimetres, inches, a numeric size or a letter and see…
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Hardness scale converter
A steel part at 40 HRC reads about 371.4 Brinell or 392 Vickers. Convert between Rockwell C, B and A, Brinell, Vickers and Knoop through one steel reference…
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Hectares to acres converter
One hectare is exactly 10000 square metres, which makes it 2.471053814672 international acres. Turn farm, forest or cadastral areas into the acres used in…
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📏 Unit convertersFree
Humidity ratio converter
0.01 kg/kg of moisture is 70 grains per pound: switch a mixing ratio between six units when an HVAC grains table, an SI model and a weather report disagree…
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📏 Unit convertersFree
Hydraulic conductivity converter
0.00001 m/s of hydraulic conductivity is 3.6 cm/h: switch a K value between eleven metric and US units while you read a borehole log, a packer test or a liner…
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Imperial gallons to US gallons converter
1 imperial gallon is 1.200949925505 US gallons: turn a British volume into the smaller US liquid gallon for American packaging, fuel logs, imported recipes and…
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Inches to cm converter
12 inches is 30.48 cm: multiply any inch length by the exact 2.54 and see the working on one line, for size charts, product listings, homework, shipping labels…
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Jerk converter
1 m/s³ is 0.101971621298 g/s: move a jerk value between six units when ride-comfort limits come in g/s, robot motion profiles in m/s³ and an old lab sheet in…
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Joules to foot-pounds converter
1 joule is 0.737562149277 foot-pounds: turn an SI energy figure into the ft·lbf found in mechanics textbooks, impact and ballistic tables and North American…
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kg/m³ to lb/ft³ converter
1000 kg/m³ is 62.427960576145 lb/ft³: turn an SI density from a lab report, a European label or a fluid-mechanics problem into the bulk density on US materials…
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KG to stone converter
Turn a weight in kilograms into British stone with the exact factor: 6.35029318 kg make 1 stone, and 70 kg come to just over 11 stone.
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📏 Unit convertersFree
KM to miles converter
Divide kilometers by exactly 1.609344 and get statute miles: 1.609344 km make exactly 1 mile, with no 0.62 rule of thumb in between.
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2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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