Developer
33 tools available
33 tools available
Base64 Encoder/Decoder
Fast conversion between string and base64 encodings
JSON Tree Viewer
Inspect nested JSON structures and fix syntax errors
JWT Encoder/Decoder
Decode a JWT to read its header, payload and expiry status. Decoding only: signatures are not verified.
UUID Generator
Generate UUID v4 and v7 in bulk, with formatting options and a built-in validator.
URL Encoder / Decoder
Encode and decode URLs in real time, with full UTF-8 support.
JSON to CSV
Convert a JSON array of objects into a CSV table without dropping any fields.
CSV to JSON
Convert a CSV table into a pretty-printed JSON array.
JSON to YAML
Convert JSON to readable YAML, handy for config files and CI/CD.
YAML to JSON
Convert YAML to pretty-printed JSON, parsed safely.
JSON to XML
Convert JSON to XML with a configurable root element.
XML to JSON
Convert XML to pretty-printed JSON, with attributes and repeated elements handled correctly.
CSV to YAML
Convert a CSV table into a YAML list, with each row as one item.
YAML to CSV
Convert a YAML list into a CSV table without dropping any fields.
JSON Formatter
Pretty-print and validate JSON text, with 2/4-space or tab indentation, and an optional one-line minify
YAML Formatter
Parse YAML and re-output it with consistent indentation, parsed safely.
XML Formatter
Validate and re-indent XML while preserving attributes and text content.
HTML Formatter
Pretty-print HTML source with clean indentation. The result is shown as plain text only.
CSS Formatter
Format CSS stylesheets with clean indentation, including nested rules and media queries.
Regex Tester
Test regular expressions and inspect matches and capture groups, with common flag support.
Hash Generator
Generate SHA-256, SHA-384 and SHA-512 hashes for text or files locally in your browser. Nothing is uploaded.
Cron Parser
Check a cron expression and see when it runs next in any time zone.
HTML Entity Encoder/Decoder
Encode text to HTML entities or decode entities back to plain text, right in your browser.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal instantly, including very large numbers.
URL Parser / Query Inspector
Break a URL into its protocol, host, path and query parameters, with every parameter listed in a table.
CSV Viewer/Validator
Paste or upload a CSV to view it as a table, with checks for duplicate headers, malformed quotes and inconsistent rows.
Markdown Preview
Live-preview Markdown with support for GFM tables, task lists and strikethrough.
SQL Formatter
Format SQL for PostgreSQL, MySQL, SQLite and other dialects. Formatting only: nothing is executed or connected.
Mermaid Live Editor
Edit Mermaid syntax with a live diagram preview and export to SVG or PNG.
LLM API Cost Calculator
Compare per-request and monthly API costs across OpenAI, Anthropic and Gemini, with the price check date.
LLM VRAM Calculator
Estimate the VRAM an LLM needs and check whether it fits on your GPU.
RAG Chunk Visualizer
Paste a document to see RAG chunking and embedding cost estimates live. Your text is never uploaded.
Cloud Storage Cost Calculator (S3, R2, B2)
Compare monthly storage and egress costs on AWS S3, Cloudflare R2 and Backblaze B2.
SLA Uptime Calculator
Turn 99.9% or 99.99% into allowed downtime per month and year, and combine availability.