Developer & Web
Free tools that do the work in your browser.
Code & Data
JSON FormatterPaste JSON and get it indented, sorted and readable, with the first syntax error located by line and column. Runs entirely in your browser, nothing uploaded.Base64 EncoderEncode any text to Base64, accents and emoji included, with the URL-safe alphabet as an option. Runs in your browser: nothing is uploaded and there is no limit.Base64 DecoderDecode Base64 back to readable text, UTF-8 safe, standard alphabet or URL-safe. Runs in your browser: nothing is uploaded and nothing leaves the page.JSON ValidatorPaste JSON and get a verdict: valid, or the exact line and column where the parser gave up, with the reason named. Runs in your browser, nothing uploaded.JWT DecoderPaste a JSON Web Token and read its header, its claims and its expiry in plain text. The token stays in your browser; the signature is shown, never checked.Text ComparePaste two versions and see what was added, removed and left alone, line by line. Download the result as a unified diff. Runs in your browser, nothing uploaded.XML FormatterPaste XML and get it indented and readable, or minified in one click. Names the tag that was never closed instead of failing silently. Runs in your browser.SQL FormatterPaste a query and get each clause on its own line, keywords cased consistently and subqueries indented to their real depth. Runs in your browser, no upload.Password GeneratorGenerate strong random passwords of any length, with the entropy in bits shown. Uses the browser’s cryptographic randomness; nothing is sent anywhere.Hash GeneratorGet the MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text at once, and compare them against a published checksum. Nothing is uploaded, nothing is stored.UUID GeneratorGenerate UUIDs in bulk, version 4 random or version 7 time-ordered, and inspect an existing one to read its version. Runs in your browser, nothing uploaded.Unix Timestamp ConverterConvert a Unix timestamp to a readable date, or a date to a timestamp, in seconds or milliseconds, with the time zone trap spelled out instead of assumed.
Web & Network
URL EncoderPercent-encode text for a URL, with the three modes that actually differ: a single value, a whole address, or a form field. Runs in your browser, no upload.URL DecoderDecode a percent-encoded URL back into readable text, with its query parameters split out and decoded one by one. Runs in your browser, nothing is uploaded.