All tools

25 available · 1 in the pipeline.

JSON & Data

Format, validate and convert structured data.

CSV to JSON

Convert CSV rows to a JSON array of objects locally in your browser.

Open
JSON Formatter

Beautify and format JSON with selectable indentation, instantly in your browser. No upload, no sign-up.

Open
JSON Minifier

Compress JSON to a single compact line to save bytes in API responses and config files.

Open
JSON Query

Query, filter and transform JSON with jq expressions, locally in your browser. No upload, no sign-up.

Open
JSON to CSV

Convert a JSON array of objects to CSV locally in your browser.

Open
JSON to TypeScript

Generate TypeScript interfaces and types from a JSON document, locally in your browser. Nested interfaces, arrays, optional fields and unions — no upload.

Open
JSON Validator

Validate JSON syntax and get the exact line and column of the first error, plus document statistics.

Open
YAML Validator

Validate YAML and locate syntax errors with line, column and a code frame — locally in your browser, nothing uploaded.

Open

Encode and decode text and data for the web.

Base64 Encoder / Decoder

Encode and decode Base64 text locally in your browser, UTF-8 safe.

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QR Code Generator

Create QR codes locally in your browser — no signup, no watermark, no tracking. Download as clean SVG or PNG.

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URL Encoder / Decoder

Percent-encode and decode URL components locally in your browser.

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Hash, sign and inspect cryptographic material and tokens.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes locally in your browser.

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HMAC Generator

Generate keyed HMAC-SHA1, SHA-256, SHA-384 and SHA-512 signatures locally in your browser. For webhooks, APIs and signed messages.

Open
JWT Decoder

Decode and inspect JWT header and payload locally in your browser — without verifying the signature.

Open
Signing Key Generator

Generate RSA, ECDSA and Ed25519 signing key pairs locally in your browser, exported as JWK and PEM. For JWT and application signing — not SSH keys or certificates.

Open

Check how a domain answers: DNS records and HTTP responses.

DNS Lookup

Ask several public resolvers the same DNS question at once and see where they disagree. A, AAAA, CNAME, MX, TXT, NS, SOA and CAA, in your browser.

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Website Status Checker

Check whether a website is up — or trace where a link goes. Get HTTP status, response time, every redirect hop and the final URL.

Open

Analyze and work with text and regular expressions.

Code Formatter

Format and beautify JavaScript, TypeScript, JSON, CSS, HTML, Markdown, YAML, XML and SQL, locally in your browser. No upload, no sign-up.

Open
HTML Editor

Edit HTML visually or directly in the source — a browser-based WYSIWYG HTML editor with live source editing. No upload, no sign-up.

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Regex Tester

Test regular expressions against text and see every match, locally in your browser.

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Text Counter

Count words, characters, lines, sentences and paragraphs of your text, locally in your browser.

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Text Diff

Compare two texts or code snippets side by side, line by line, entirely in your browser. See added, removed and unchanged lines — no upload.

Open

Convert Unix timestamps and dates.

Cron Expression

Validate, explain, build and preview the next runs of a cron expression — with timezone and DST handling, locally in your browser.

Open
Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates, locally in your browser.

Open

Generate unique identifiers.

UUID Generator

Generate RFC 4122 version 4 UUIDs in bulk and copy them with one click, entirely in your browser.

Open

HTTP Status Codes

Every HTTP status code with its reason phrase, whether it is cacheable, whether it can carry a body, and when to use it.

Open
MIME Types

A filterable reference of common MIME types with their file extensions and categories.

Open