CalculatorsEMI, SIP, GST, percentages and more — instant, accurate, free.ConvertersUnit and number-base converters for everyday engineering.FormattersBeautify, validate and transform text and code.GeneratorsUUIDs, passwords and other things you need on demand.CryptographyHashes and encodings, computed locally in your browser.Data & TransformConvert JSON, CSV, YAML, XML & TOML — and generate code from JSON.CSV ToolsConvert, clean, filter, analyze and transform CSV files — all in your browser.Encoding & DecodingBase64, Base32/58/62, Hex, Octal and Punycode encoders & decoders.Text ToolsCase conversion, counting, sorting, dedupe, reverse and more.ValidatorsValidate JSON, YAML, XML, CSV, TOML and more — with clear error messages.Repair ToolsFix broken JSON, CSV, XML, YAML and other malformed data.Diff & CompareCompare two texts, JSON, CSV, YAML, XML and more — highlight the differences.QR & BarcodesGenerate WiFi, vCard, URL and other QR codes, plus Data Matrix & Aztec barcodes.MinifiersShrink JSON, CSS, JavaScript, XML and SVG by removing whitespace.BeautifiersPretty-print and indent CSS, HTML and JavaScript.Security & TokensJWT, HMAC, key pairs, TOTP, PKCE, secure tokens and password tools.Developer UtilitiesCron, regex, timestamp, URL, JSONPath, XPath, escaping and more.Format ConvertersMarkdown⇄HTML, env/INI/properties⇄JSON, NDJSON, SVG data-URI and more.Image ToolsResize, crop, convert, compress, recolor and extract palettes — all in your browser.
Learn
Blog

Guides

Learn

Clear, practical explainers for the concepts behind our tools.

UUIDs ExplainedWhat UUIDs are, the difference between versions (v1, v3, v4, v5, v7), when to use each, and their trade-offs.CSV Files ExplainedThe CSV format, RFC 4180 quoting rules, encodings, common pitfalls, and how CSV compares to TSV, JSON and Parquet.Base64 & Data Encoding ExplainedHow Base64, Base32/58/62, Hex, Octal and Punycode differ, when to use each, and why encoding is not encryption.JWT & Web Tokens ExplainedHow JSON Web Tokens work — structure, signing (HS256 vs RS256), claims, verification and best practices.Diffing & Comparing Files ExplainedHow text and structural diffs work, why JSON/YAML need normalisation, and when to use each.QR Codes & Barcodes ExplainedHow QR codes store data, error-correction levels, payload formats (WiFi, vCard, URL) and 2D barcode types.Validating Data Formats ExplainedWell-formedness vs schema validity, per-format pitfalls (JSON, YAML, XML, CSV) and how to fix them.JSON, YAML, XML & TOML: Data Formats ComparedThe strengths, pitfalls and best uses of JSON, YAML, XML and TOML — and what gets lost when converting.Hashing, HMAC & Checksums ExplainedCryptographic hashes vs encryption vs encoding, which algorithm to use, HMAC, and how to hash passwords.