Developer tools

Format, validate and minify JSON without rewriting its numeric literals.

Encode UTF-8 text or a file as Base64, or decode Base64 text.

Test matches, capture groups and replacements in an isolated worker with a time limit.

Compare two texts by line or word and inspect additions and removals.

Format HTML source with configurable indentation without executing it.

Validate XML and format it for reading while retaining meaningful text.

Format SQL for a selected dialect and keyword style.

Parse and compress CSS while preserving licence comments.

Minify JavaScript with optional identifier mangling and no code execution.

Calculate file or UTF-8 text hashes locally, including SHA-256, SHA-384, SHA-512, SHA-1 and MD5.

Inspect JWT claims and optionally verify an HMAC signature with a key you supply locally.

Generate random UUID v4, time-ordered v7, v1 or nil UUIDs.

Encode URL components or decode percent-encoded text.

Convert UTF-8 text to eight-bit binary bytes and back.

Convert signed integers between bases 2–36 with arbitrary-precision arithmetic.

Convert epoch seconds, milliseconds or microseconds to UTC dates and back.

Convert a YAML document to JSON or turn JSON into YAML.

Infer a TypeScript type from a sample JSON document, including nested objects and unions.

Write Markdown with a sanitized preview and export Markdown or HTML.

Clean active content and editor metadata from an SVG, then serialize a compact copy.

Combine practical ignore rules for your project’s languages, tools and operating systems.

Generate synthetic JSON, CSV or SQL rows using an explicit field schema.

Build encoded email links with recipients, subject and message text.

Create calendar links and a downloadable ICS event with UTC times and an optional reminder.

Create Code 128, EAN-13, UPC-A or Code 39 barcodes as SVG and PNG.

Build a linear or radial gradient with a visual preview and CSS export.

Adjust shadow offsets, blur, spread and opacity with a live result preview.

Create a CSS grid with rows, columns, gaps and an example layout.

Set flex direction, alignment, justification and gaps with a layout preview.

Read an XLSX workbook locally and export each worksheet as JSON records.

Create an XLSX workbook from a JSON array while retaining numeric and boolean cell types.

Open a SQLite database, inspect its table list and run read-only queries locally.

Write a plain-text note and create an encrypted share link that carries the note in its URL fragment.

Read your browser’s viewport, screen dimensions, pixel ratio, colour depth and reported colour-gamut support.

Show the public connection IP address seen by MakePip and the available country code.