💻 Developer

Formatters, encoders, and generators

Base64 Encoder & DecoderEncode and decode text or files as Base64. Text is handled as UTF-8, so non-ASCII text stays intact. URL-safe option, data URLs, download of decoded content.
Color Converter & Contrast CheckerConvert a CSS color to HEX, RGB, HSL, HWB, LAB, LCH and OKLCH in one go, and check whether a text and background pair passes WCAG AA and AAA contrast.
Cron Expression ExplainerTurn a cron expression into a plain sentence and list up to 20 upcoming run times in the time zone you pick. Reads 5 fields, or 6 with seconds first.
CSS Gradient GeneratorBuild linear, radial and conic gradients with a live preview and copy the background CSS. OKLCH interpolation adds a fallback line for older browsers.
CSV to JSON ConverterConvert CSV to a JSON array of objects, or JSON to CSV. Detects the delimiter, flattens nested JSON and can add a BOM for Excel. Files never go to a server.
Hash GeneratorCompute MD5, SHA-1, SHA-256, SHA-384, SHA-512, SHA3-256 and BLAKE3 hashes of text or a file in one go, then check them against a published checksum.
JSON FormatterPretty-print or minify JSON and see the line and column of syntax errors. Sort keys, escape Unicode, allow comments, get big-integer and duplicate-key warnings.
JSON YAML ConverterConvert JSON to YAML and YAML to JSON. Errors point to the line and column, and values like yes/no follow YAML 1.2. Nothing leaves your browser.
JWT DecoderPaste a JWT to see its header and payload as JSON, with exp, iat and nbf turned into dates and an expiry check. The signature is not verified.
SQL FormatterFormat a SQL query onto indented lines by clause (SELECT, FROM, WHERE …) for Standard SQL, MySQL, PostgreSQL, SQLite, T-SQL or BigQuery. Not a syntax checker.
SVG optimizerClean comments and metadata from SVG files. Preview the image and code, then download an SVG that preserves paths and IDs.
Unix Timestamp ConverterConvert Unix timestamps to dates and back. Detects seconds, ms, µs and ns, shows ISO 8601 in any time zone, plus the current epoch time.
URL Encoder & DecoderPercent-encode or decode URLs and query strings as a single value (encodeURIComponent) or whole URL (encodeURI). Split a URL into protocol, host, path, params.
UUID Generator (v4 & v7)Generate 1–1000 version 4 or version 7 UUIDs at a time, or paste a UUID to read its version, variant and the creation time stored in a version 7 value.
XML FormatterIndent XML one element per line or minify it to one line. Shows the line and column where a document isn't well-formed. Comments, CDATA and DOCTYPE are kept.

What you can do with the Developer tools

There are formatters that make JSON, XML and SQL easier to read, Base64 and URL encoders and decoders, hash and UUID generators, a JWT decoder, a cron expression explainer, and color conversion and CSS gradient tools. Use them when you’re inspecting an API response or a log, checking a configuration value, or creating values for a test. Each tool has instructions and frequently asked questions at the bottom of its page.

Things to know

What you enter is processed inside your browser only and isn’t sent to a server. Even so, when you work with tokens or secret keys from a live service, take care that they aren’t exposed some other way, such as through screen sharing. Base64 is encoding, not encryption, so anyone can turn it back into the original content. The JWT decoder only shows what’s in a token. It doesn’t verify the signature.