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🎧 Audio & VoiceFree
Convert decibels to linear amplitude
About 6.0206 dB doubles an amplitude, and 0 dB is a multiplier of exactly 1. Convert gains in either direction with the standard amplitude rule of 20 times the…
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🎧 Audio & VoiceFree
DTMF Tone Frequency Lookup for Telephone Keypad Keys
Key 5 on a telephone keypad plays 770 Hz and 1336 Hz at the same time. Enter any digit from 0 to 9, the asterisk or the number sign to get its exact low and…
K
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🎧 Audio & VoiceFree
Audio fade envelope calculator
A 12-second clip with a 2.5-second fade-in and a 3-second fade-out gets four points: silence at 0, full gain at 2.5 and at 9, and silence at 12 seconds.
K
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🎧 Audio & VoiceFree
Generate a metronome click track specification from BPM and bars
At 120 BPM in 4/4, two bars give 8 clicks every 0.5 seconds, from 0 to 3.5, with the first beat of each bar accented and a total length of 4 seconds.
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🎧 Audio & VoiceFree
Loudness normalization gain calculator
A master measured at -18.2 LUFS needs +4.2 dB to reach the -14 LUFS streaming target. Enter your meter reading and choose a target such as broadcast at -23 LUFS…
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🎧 Audio & VoiceFree
Pitch shift frequency ratio calculator
Raising A4 at 440 Hz by 12 semitones gives a ratio of exactly 2 and a new frequency of 880 Hz. Enter any positive, negative or fractional shift to get the…
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🎧 Audio & VoiceFree
Podcast chapter timestamp formatter
Chapters starting at 0, 83 and 3665 seconds become 00:00:00, 00:01:23 and 01:01:05, each followed by its title and ready to paste into show notes.
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🎧 Audio & VoiceFree
Sample rate conversion ratio calculator
Going from 44,100 to 48,000 samples per second is an upsample with a ratio of 160:147. Enter any source and target rate to get the exact multiplier and…
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🎧 Audio & VoiceFree
Silence detection threshold calculator for audio
A -60 dB noise floor with a 12 dB margin gives a -48 dB silence threshold and a 550 ms minimum gap.
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🎧 Audio & VoiceFree
Audio tempo change calculator
Speeding a 240-second clip from 120 to 150 BPM is a 25% tempo increase, and the clip shrinks to 192 seconds.
K
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🎧 Audio & VoiceFree
Trim audio by timestamp
A start at 30.5 seconds and an end at 95.25 seconds give a 64.75-second clip, checked against a 245.75-second recording.
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🎧 Audio & VoiceFree
Adjust audio volume in decibels
A peak at -6 dBFS raised by 4.5 dB lands at -1.5 dBFS, leaving 1.5 dB of headroom and no clipping.
B
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❤️ Health & fitnessFree
Calculate daily calorie needs from BMR and activity level
A BMR of 1600 kcal with a moderately active week becomes 2480 kcal a day once the 1.55 multiplier is applied.
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🏠 Home, food & hobbiesFree
Calculate tip and split a bill
Settle a shared bill without doing sums at the table: 120 with an 18% tip split between 4 people means a 21.6 tip, a 141.6 total and 35.4 each.
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❤️ Health & fitnessFree
Calculate Recommended Daily Water Intake by Weight
Get a daily water target sized to your body: at 70 kilograms with a moderately active day, 35 ml per kilogram times 1.15 comes to 2,818 ml, or 2.818 liters.
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🎓 EducationFree
Calculate grade needed on final exam
Know the score to aim for before the exam: with an 84 average, a final worth 30 % and a target of 85, you need about 87.33 on the final.
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🖼️ ImagesFree
Generate an analogous color palette from any hex color
Choose a base color and how many swatches you need, and they are spread evenly across a 60-degree hue window: five colors from #3366cc run from #33b2cc to…
K
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🖼️ ImagesFree
Color Blindness Simulator for Protanopia, Deuteranopia, and Tritanopia
Preview how one color may appear with protanopia, deuteranopia or tritanopia: #3A86FF under deuteranopia becomes #5751DB.
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🖼️ ImagesFree
Convert CMYK to RGB
Get the three screen channels for a print color and nothing else: C0 M50 Y100 K0 gives red 255, green 128 and blue 0.
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🖼️ ImagesFree
Compute WCAG color contrast ratio
Calculate the WCAG contrast ratio together with the luminance behind it: black on white gives luminances of 0 and 1 and a ratio of 21:1, passing AA and AAA.
B
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🖼️ ImagesFree
Expand hex color shorthand
Get the long form of a short CSS color: #3a7 becomes #33aa77 because every digit is repeated, never padded with zeros, and you also get 33aa77 without the hash.
B
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🖼️ ImagesFree
Convert hex color to RGB values from 0 to 255
Get the three numbers inside a hex code: #4a90e2 splits into 4a, 90 and e2, which are red 74, green 144 and blue 226.
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🖼️ ImagesFree
Convert HSL to RGB
Get plain red, green and blue numbers from an HSL color: hue 210, saturation 80% and lightness 45% come out as red 23, green 115 and blue 207.
B
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🖼️ ImagesFree
Perceived brightness calculator
Red 52, green 152 and blue 219 score a perceived brightness of 129.738, just above the 128 cut-off, so the color counts as light and takes black text (#000000).
K
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🖼️ ImagesFree
Material Design palette generator
Start from #3F51B5 and get ten Material shades: your color stays at 500, shade 50 lightens to #A3ABDB and shade 900 darkens to #20295B.
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🖼️ ImagesFree
Lookup color name from hex
#ff5733 comes back as tomato, the nearest named color (#ff6347), at a distance of 23.323808, so you know it is close but not an exact match.
F
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🖼️ ImagesFree
Estimate the nearest Pantone-style color family from RGB
Red 30, green 90 and blue 160 (#1E5AA0) is described as rich blue: the nearest broad Pantone-style family plus a tone, without claiming an exact swatch number.
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🖼️ ImagesFree
Seeded random color palette generator
Five pastel colors from the seed summer-campaign-2026 always come back as #a6e7da, #e5aebd, #86ea86, #c7e6ea and #eeafe0.
F
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🖼️ ImagesFree
Convert RGB to CMYK
Convert RGB to CMYK with two-decimal precision: 46, 139, 87 gives cyan 66.91 %, magenta 0 %, yellow 37.41 % and black 45.49 %.
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🖼️ ImagesFree
Convert RGB color to hex
Turn red, green and blue into one uppercase color code: 255, 128, 0 becomes #FF8000. The result always has the full six digits, so codes line up when you…
F
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🖼️ ImagesFree
Convert RGB to HSL
Get the HSL values of an RGB color to four decimal places: 255, 128, 64 is hue 20.1047°, saturation 100 % and lightness 62.549 %.
K
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🖼️ ImagesFree
Convert color temperature to RGB
See how a light temperature looks on screen. 6500 K gives red 255, green 254 and blue 250, written #fffefa.
K
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🖼️ ImagesFree
Generate a triadic color palette from any hex color
Enter #336699 and get its two triadic companions, #993366 and #669933, rotated 120 and 240 degrees around the color wheel.
M
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🗂️ Data & FilesFree
Validate a credit card number with the Luhn checksum
4111 1111-1111 1111 passes the Luhn check and is reported as Visa. Spaces and hyphens are removed, every other character must be a digit, and you learn whether…
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🗂️ Data & FilesFree
Convert a cron schedule to a readable list of upcoming run times
*/20 9-10 * * 1-5, starting after 09:05 UTC on 27 July 2026, runs at 09:20, 09:40, 10:00 and 10:20.
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🗂️ Data & FilesFree
Compute CSV column statistics
Scores of 10, 20, 30 and 40 give a mean and a median of 25 and a standard deviation just over 11. Paste a CSV, name one numeric column, and get its five key…
R
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🗂️ Data & FilesFree
Validate CSV against a column schema
Check every row of a CSV against the columns you expect and get all the problems at once: in the example, 3 rows produce 3 reports, from a score that is not a…
B
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🗂️ Data & FilesFree
Detect CSV delimiter
Paste a few lines of a CSV and learn what separates its columns: in the example, two semicolons on each of 3 lines reveal a semicolon file with 3 columns.
R
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🗂️ Data & FilesFree
JSON object diff
Put the old and new version of a data record side by side and get the real differences sorted out: in the example, 2 additions, 1 removal and 2 changes, 5 in…
K
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🗂️ Data & FilesFree
Convert Excel column letters to numbers and numbers to letters
Turn spreadsheet column letters into numbers and back again: AA is column 27, Z is 26 and XFD is 16384, while typing 52 gives AZ.
K
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🗂️ Data & FilesFree
Flatten nested JSON to table with dot-notation keys
Turn nested data into a flat list of rows, each with its full path: the city inside a customer's address becomes customer.address.city, and the first order's…
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🗂️ Data & FilesFree
Validate IBAN format, country length, and checksum
Check an IBAN before a payment goes out: DE89 3704 0044 0532 0130 00 is a German number with the required 22 characters and correct check digits, so it passes.
K
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🗂️ Data & FilesFree
Validate an IPv4 address
Find out whether an IPv4 address is written correctly before it goes into a configuration: 192.168.1.25 passes, with each of its four parts between 0 and 255.
K
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🗂️ Data & FilesFree
Validate and convert ISBN-10 and ISBN-13 checksums
Check an ISBN and get both forms at once: 0-306-40615-2 is a valid ISBN-10, and its thirteen-digit form is 9780306406157, with the check digit recalculated…
R
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🗂️ Data & FilesFree
Validate JSON Against Schema
Find out whether a record meets the rules it is supposed to follow: in the example, Ada with age 37 and the tags math and code meets every rule, so the list of…
R
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🗂️ Data & FilesFree
Format and normalize a MAC address to uppercase colon notation
Turn any common MAC address notation into one consistent form: a4b1.c122.3d4e becomes A4:B1:C1:22:3D:4E.
R
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🗂️ Data & FilesFree
Merge two CSV files on a key
Merge two CSV files on a shared key, keep every row of the main file and get the leftovers listed apart: in the example, Linus matches two rows and appears…
K
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🗂️ Data & FilesFree
Base64 Encode and Decode Text
Turn text into Base64 and back with no guesswork: «Hello, 🌍!» becomes SGVsbG8sIPCfjI0h, emoji included, in the standard or the URL-safe alphabet.
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🗂️ Data & FilesFree
Format an international phone number by country
Give a number and its country and get it back in clean international form: (202) 555-0147 in the United States becomes +1 202 555 0147, plus the compact…
K
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🗂️ Data & FilesFree
Validate postal code format by country
Check that a postal code has the right shape for its country: 94105-1234 passes for the United States, whose pattern is 99999 or 99999-9999.
F
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🗂️ Data & FilesFree
Random sample CSV rows with a seed
Pick an exact number of CSV rows at random and get the same pick again whenever you reuse the seed.
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🗂️ Data & FilesFree
Redact common PII patterns in text
Mask emails, phone numbers and card-like digit runs before a text reaches logs or tickets: in the example, two emails, one phone and one card number become…
R
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🗂️ Data & FilesFree
Batch slugify a list of titles with unique URL slugs
Turn a whole list of titles into unique web-address slugs at once: «Hello World» and «Hello, World!» become hello-world and hello-world-2, and «Café Guide»…
F
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🗂️ Data & FilesFree
Unflatten dot keys to nested JSON online
Rebuild a nested record from flat dotted names: user.contact.email goes back inside contact, inside user, while active and the score of 42 stay at the top…
F
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🗂️ Data & FilesFree
Check VAT number format by EU country
Check that a VAT number has the right shape for its EU country: «DE 136-695-976» is read as DE136695976 and passes the German pattern.
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📅 Dates & timeFree
Columbus Day date calculator
Columbus Day 2026 falls on Monday 12 October: the second Monday of October, a US federal holiday that many cities also call Indigenous Peoples' Day.
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📅 Dates & timeFree
Juneteenth date calculator
Enter a year and get Juneteenth, June 19, plus the day US federal offices observe it: in 2026 June 19 is a Friday, so both dates match.
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📅 Dates & timeFree
MLK Day date calculator
Enter a year and get the date of Martin Luther King Jr. Day, the third Monday of January: in 2026 it falls on January 19.
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📅 Dates & timeFree
Presidents' Day date calculator
In 2026 Presidents' Day falls on Monday 16 February, the third Monday of the month that federal law sets for Washington's Birthday.
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⚙️ Developer UtilitiesFree
Minify CSS code and measure the size reduction
Shrink a stylesheet without touching its meaning: the sample drops from 101 to 71 bytes, a 29.7 % saving, while the text inside quotes, even a /* label */ {x}…
M
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1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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