Developer & Web

Format or minify JSON in five styles, sort keys by name, decode \u escapes and auto-fix …

Pinpoints JSON syntax errors and how to fix them, then lets you explore valid JSON as a …

Converts JSON and YAML both ways. Edit either pane, see the same value on the other side…

Convert between a JSON array and JSONL. It sets the direction for you and shows missing …

Convert CSV and JSON both ways, with delimiter auto-detection, nested JSON flattening, a…

Detects commas, tabs and semicolons and converts CSV and TSV both ways. Shows which cell…

Turn Markdown tables into CSV or Excel, and CSV or Excel cells into Markdown tables, wit…

Convert Excel column letters and numbers both ways, with cell addresses, R1C1, position …

Converts Markdown to HTML with a live web preview, and checks for emphasis left as symbo…

Turn HTML and text copied from a web page into GFM Markdown, and see the document struct…

Removes the tags from HTML and keeps the readable text, while showing how the source spl…

Convert text and files to Base64 and back, and see how 3 bytes become 4 characters and w…

Decodes URLs full of % codes and encodes text with single-value, whole-URL, form and str…

Split a URL query string into an editable table, rebuild the URL, remove tracking parame…

Convert characters and U+ code points in 9 notations, and browse names, blocks and the c…

Convert text to UTF-8 hex and back, with the bytes and bits of every character and the p…

Convert binary, octal, decimal, hex and bases 2–36 from any field, with a two's compleme…

Calculate the SHA-256 of a file or text, compare it with a reference value or checksum l…

Decodes a JWT, explains each claim, and checks the signature, expiry and issuer in order…

Generate up to 1,000 UUID v4, v7 or v5, copy them in the format you need, and read the v…

Make a random password, word passphrase or numeric PIN, choose length and symbols, and c…

Shows the public IP (IPv4 and IPv6) the internet sees, the location and ISP behind it, a…

Highlights where a regex matches your text and shows a group value table, replace result…

Format CSS for reading or minify it for release, and see where the bytes went and which …

Convert between 16 CSS units such as px, rem, em, % and vw, and see in bars how the real…

A flexbox generator that shows the free space, grow and shrink math behind your layout, …

Drag cells to draw areas, preview fr and minmax tracks and auto-wrapping columns, then c…

Set the sizes for two screens and get the clamp() expression, chart, zoom check and type…

Drag corners or type numbers to build border-radius code and see the radii that are actu…

Drag the light to set the direction, stack layers into a refined shadow and copy it as b…