48 tools
Developers
JSON, CSV, XML, Base64, URL and HTML tools, minifiers, regular expressions and timestamps. Everything runs in your browser.
Tools in this category
- DevelopersQR Code GeneratorMakes a QR code from any text or link, entirely in your browser.
- DevelopersJSON FormatterIndents, sorts or minifies JSON, keeping every number exactly as you wrote it.
- DevelopersUnix Timestamp ConverterConverts between Unix time and a readable UTC date, in both directions.
- DevelopersBase64 EncoderEncodes text to Base64, handling accents and any other UTF-8 correctly.
- DevelopersRegex TesterRuns a regular expression against text and shows every match and capture group.
- DevelopersBase64 DecoderDecodes Base64 back to text, with or without padding, plain or URL-safe.
- DevelopersJSON ValidatorSays whether a JSON document is valid and, if not, exactly where it breaks.
- DevelopersURL EncoderPercent-encodes text so it can be dropped safely into a URL or a query string.
- DevelopersJSON to CSV ConverterTurns a JSON array of objects into a comma-separated table you can open in a spreadsheet.
- DevelopersURL DecoderTurns a percent-encoded link back into readable text, UTF-8 included.
- DevelopersCSV to JSON ConverterTurns a CSV table into a JSON array of objects, guessing numbers and booleans.
- DevelopersMarkdown to HTML ConverterTurns Markdown into clean HTML, with everything escaped safely first.
- DevelopersCSS MinifierStrips comments and needless whitespace from a stylesheet, safely.
- DevelopersQR Code CustomizerThe same QR code with your own colours, module size and quiet zone, as a downloadable SVG.
- DevelopersHTML EncoderEscapes the five characters that would otherwise be read as markup.
- DevelopersBarcode GeneratorCode 128 and EAN-13 barcodes as SVG, with the check digit worked out for you.
- DevelopersURL ParserBreaks a link into scheme, host, port, path, query parameters and fragment.
- DevelopersHTML DecoderTurns HTML entities back into the characters they stand for.
- DevelopersImage ResizerChange the pixel size of a picture without leaving the page — fit it in a box, cover one, or scale it by a percentage.
- DevelopersXML FormatterIndents XML so the structure is visible, or strips the whitespace back out again.
- DevelopersHTML MinifierCollapses whitespace and removes comments, leaving pre and script blocks alone.
- DevelopersImage CompressorSqueeze a photo down to a smaller file at the same pixel size, and see exactly how many bytes you saved.
- DevelopersJavaScript MinifierRemoves comments and spare whitespace from JavaScript, conservatively.
- DevelopersHash GeneratorThe SHA-256, SHA-512, SHA-1 or MD5 hash of any text, in hex, capitals and Base64, worked out in your browser.
- DevelopersXML ValidatorChecks that an XML document is well formed and says which tag broke it.
- DevelopersImage ConverterTurn a picture into PNG, JPEG or WebP in your browser, and see what the change does to the file size.
- DevelopersImage to PDF ConverterPut a picture on an A4 or Letter page and save it as a PDF, with the margin and orientation you choose.
- DevelopersCSS Gradient GeneratorBuild a linear, radial or conic gradient and get the CSS line, with the contrast between the two ends.
- DevelopersImage CropperKeep a rectangle of a picture and throw the rest away, with the exact pixel numbers rather than a rough drag.
- DevelopersPassphrase GeneratorA password made of random common words, with the exact entropy stated so you can judge it rather than trust it.
- DevelopersBox Shadow GeneratorBuild a CSS box shadow or text shadow from the offsets, blur, spread and colour, and see how much room it needs.
- DevelopersPNG to JPG ConverterSave a PNG as a JPEG at the quality you choose, and see how many bytes that costs or saves.
- DevelopersRandom Token GeneratorRandom strings in hex, Base58, Base64 or digits, with the exact number of bits of entropy they carry.
- DevelopersVideo Bitrate CalculatorBitrate from resolution, frame rate and bits per pixel, with the file size, the raw uncompressed rate and the compression ratio.
- DevelopersScreen Resolution CheckerThe size of the screen you are on, in the pixels pages are told about and in the pixels the panel really has.
- DevelopersBorder Radius GeneratorSet four corners and get the shortest CSS that produces them, with a warning when the box is too small to hold them.
- DevelopersJPG to PNG ConverterSave a JPEG photograph as a PNG file, in your browser, without sending it anywhere.
- DevelopersHTML PreviewPaste HTML and see it drawn straight away, with a count of the elements and a list of any tags left open.
- DevelopersAudio File Size CalculatorHow much space uncompressed audio takes, from the sample rate, bit depth, channels and length — and how much a compressed version would take.
- DevelopersBrowser CheckerWhat browser you are using, which version, which engine and which system — read from the line your browser announces.
- DevelopersStreaming Bandwidth CalculatorPeak bandwidth for a number of concurrent viewers, and the monthly data transfer and cost that follow from it.
- DevelopersWebP to JPG ConverterTurn a WebP picture into an ordinary JPEG that any program will open.
- DevelopersDevice CheckerWhat your browser is willing to say about the machine underneath: platform, processor cores, memory and touch.
- DevelopersAudio Latency CalculatorBuffer latency in milliseconds, round-trip delay, and the distance you would have to stand back to feel the same thing.
- DevelopersColour Depth CalculatorLevels per channel, total colours, raw bitrate and the size of one banding step, for any bit depth.
- DevelopersFFT Resolution CalculatorFrequency bin width, window length, usable bins and hop size, from the sample rate and the FFT size.
- DevelopersChroma Subsampling CalculatorData rate and frame size for 4:4:4, 4:2:2, 4:2:0 and 4:1:1, with the chroma resolution and what each one saves.
- DevelopersGOP and Keyframe Interval CalculatorGOP duration in seconds, keyframes per minute, the I, P and B counts inside a GOP, and whether it lines up with the segment length.