Computing & data calculators
Subnets, bases, bandwidth, colour and entropy.
Image ConvertertoolPNG, JPEG and WebP, with resizing — entirely in your browser.CSV to JSON ConvertertoolConvert between CSV and JSON, both directions, in your browser.QR Code GeneratortoolMake a QR code for a link, wifi network or contact — encoded in your browser, never uploaded.Hash GeneratortoolMD5, SHA-1, SHA-256 and SHA-512 for text or a file — computed in your browser.Password GeneratortoolStrong random passwords and passphrases, generated in your browser with real entropy.JSON Formatter & ValidatortoolFormat, minify and validate JSON — with the error pointed at, not just reported.Base64 Encoder & DecodertoolText or files to Base64 and back, including the URL-safe variant and data URIs.JWT DecodertoolRead the header and claims inside a JSON Web Token, with the timestamps in plain English.UUID GeneratortoolVersion 4 and version 7 UUIDs in bulk, plus a decoder for one you already have.Unix Timestamp ConvertertoolUnix time to a readable date and back, in seconds or milliseconds, UTC or local.Image CompressortoolCompress a photo to a target file size — 100 KB, 500 KB, whatever the form demands.Word & Character CountertoolWords, characters, sentences and reading time — counted as you type, never uploaded.Case ConvertertoolSentence case, Title Case, camelCase, snake_case and the rest — in one click.Diff CheckertoolCompare two texts and see exactly what changed — line by line, word by word.Lorem Ipsum GeneratortoolPlaceholder text by paragraphs, sentences or words — classic Latin or plain English.Subnet CalculatorNetwork, broadcast, host range and mask for any IPv4 CIDR block.Number Base ConverterConvert between decimal, binary, hexadecimal and octal.Download Time CalculatorHow long a transfer takes, and the units people keep confusing.Aspect Ratio CalculatorResize without distortion — give three numbers, get the fourth.Colour ConverterHEX, RGB, HSL and the contrast ratio against black and white.Password Entropy CalculatorHow much real randomness a password has, and how long it survives.Uptime & SLA CalculatorAllowed downtime for any number of nines, and the availability a given outage leaves you.RAID Capacity CalculatorUsable capacity, fault tolerance and write penalty for every common RAID level.Video Bitrate & File Size CalculatorFile size, bitrate or duration — plus what the resolution actually needs.