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342 free tools, ready when you are.
Popular tools
A curated selection for common everyday jobs.
Password and passphrase generator
Generate passwords or word-based passphrases with cryptographic randomness.
JSON formatter and validator
Validate and format JSON without rounding large integers.
Delimiter converter
Turn lines or separated values into SQL lists, arrays and custom delimited text.
Image Resizer
Resize images to an exact width or fit them within a box, with a batch download.
Merge PDF
Combine PDF pages in your chosen file order.
QR Code Generator
Generate QR images for text, URLs, Wi-Fi, contacts and messages.
Remove duplicate lines
Remove repeated lines while retaining their original order.
Base64 converter
Encode UTF-8 text or decode strict Base64 and URL-safe Base64.
Unix Timestamp Converter
Convert Unix seconds or milliseconds into a readable date, or turn an ISO time into an epoch value.
Image Compressor
Re-encode an image and compare the actual file size with the original.
Percentage Calculator
Calculate a percentage of a value, a percentage change, or the original before a percentage increase.
Text diff
Compare two texts and produce a readable unified line diff.
Text & lists
Data & CSV
JSON formatter and validator
Validate and format JSON without rounding large integers.
Bar, line and pie chart maker
Turn labelled values into a bar chart, line graph or pie chart with a clear preview, SVG image and CSV download.
Bulk file renamer
Preview new filenames with prefixes, replacements and numbering, then download a renamed ZIP.
Encoding & generators
Password and passphrase generator
Generate passwords or word-based passphrases with cryptographic randomness.
Base64 converter
Encode UTF-8 text or decode strict Base64 and URL-safe Base64.
ASCII code table and lookup
Look up all 128 ASCII codes in decimal, hexadecimal and binary, with printable characters and named control codes.
Web development
Chmod calculator
Convert Unix permission modes into readable permissions and a ready-to-copy command.
CIDR range combiner
Combine overlapping or adjacent address ranges into the smallest equivalent CIDR list.
Content Security Policy builder
Build a policy from explicit directives and check common unsafe settings.
Markdown & writing
Images & design
PDF & documents
Calculations & units
QR & barcodes
Dates & time
Unix Timestamp Converter
Convert Unix seconds or milliseconds into a readable date, or turn an ISO time into an epoch value.
Calendar Event File Generator
Create a downloadable calendar invitation without connecting to a calendar account.
Date Addition and Subtraction
Move a calendar date forwards or backwards by days, weeks, months or years.
Audio & video
Maths & science
Percentage Calculator
Calculate a percentage of a value, a percentage change, or the original before a percentage increase.
Coordinate Format Converter
Convert latitude and longitude between decimal degrees and degrees/minutes/seconds.
Descriptive Statistics Calculator
Calculate mean, median, modes, quartiles, range and standard deviation for a numeric sample.
Everyday productivity
Games & random picks
Bingo card generator
Create distinct printable word or number bingo cards using the list you provide.
Character name generator
Generate contemporary, fantasy, science-fiction or creature names for stories and games.
Coin flipper and yes-or-no picker
Flip an unbiased virtual coin or choose equally between yes and no.
Music & sound
BPM and delay time calculator
Convert a tempo into beat and note durations, including dotted and triplet delay times.
Chord player
Build and hear a musical chord or a short progression with adjustable tempo and inversion.
Chord transposer
Transpose chord names in chord sheets while keeping ordinary lyrics and spacing unchanged.
Home & garden
Aquarium volume calculator
Estimate fish tank litres and UK or US gallons using internal measurements, water level and displaced volume.
Brick and block quantity calculator
Estimate bricks or blocks for a wall using your dimensions, mortar joints, openings and extra allowance.
Compost and raised bed calculator
Convert bed dimensions into litres of compost and a whole number of your chosen bags.
Cooking & baking
Bread hydration calculator
Work out dough hydration and baker percentages, including flour and water in a starter.
Butter sticks to grams converter
Convert US butter sticks, grams, ounces, tablespoons and cups for recipes.
Cake tin size converter
Calculate the recipe multiplier when changing round, square or rectangular cake tins.
Crafts & printing
A4 address label maker
Turn one label per line into a measured A4 label sheet with adjustable margins and gutters.
Cross stitch fabric size calculator
Work out finished design and cut fabric size from stitch counts, fabric count and a border.
Envelope template maker
Create a measured envelope net with folding flaps and an actual-size PDF download.
Device checks
Left and right speaker test
Play separate left and right reference tones to check stereo speaker or headphone routing.
Mouse button and scroll tester
Inspect mouse button presses, click intervals and wheel events inside a dedicated test area.
Screen colour and pixel test
Display solid colours and simple patterns to help inspect a screen for visible pixel defects.