Headline Generator AI
Headlines for articles, pages and ads, AI or instant.
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Every one of our 1329 tools in one place — free, no sign-up, and all of them run inside your own browser.
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Blog Topic Generator AI
Post ideas built around a keyword, AI or instant.
Instagram Caption Generator AI
Captions with hashtags from a topic, AI or instant.
Email Address Parser
Split an address into every part it is made of.
International Email Validator
Check Unicode addresses and convert them to punycode.
Invoice to Excel
Turn any invoice — JSON, XML, UBL, a PDF or pasted text — into an Excel workbook.
Invoice Validation Tool
Check an invoice before you send it: required details, arithmetic and what a client can query.
E-Invoice Validator
Check a UBL or CII e-invoice against the EN 16931, Peppol and XRechnung business rules.
Invoice Tax Rate Calculator
Work out the rate from a net and a gross, or the effective rate on a mixed invoice.
Invoice Shipping Calculator
Work out a delivery charge by weight, value, zone or free-shipping threshold.
Google Sheets Invoice Template
A block of cells and formulas to paste straight into a blank Google Sheet.
Cleaning Service Invoice Generator
Bill cleaning by visit, hour or contract, with materials and extras itemised.
SEO Invoice Generator
A monthly SEO invoice with the deliverables that month actually contained.
Accessible Color Generator
Nudge a colour until it passes WCAG, keeping its hue.
Color Format Converter
One colour, every notation — HEX, RGB, HSL, HWB, LAB, LCH and OKLCH.
ChatGPT Export to Markdown
Turn conversations.json from a ChatGPT or Claude export into readable Markdown files.
Fine-Tuning Dataset Formatter
Turn question and answer pairs into a JSONL training file for OpenAI, Llama or Gemini.
Embedding Cost Calculator
Estimate the cost and vector storage of embedding a document corpus for RAG.
Context Window Calculator
See whether your text fits a model context window, and how much room is left.
CSV to vCard Converter
Build a .vcf file from a spreadsheet of contacts, with the columns matched for you.
Tailwind to CSS Converter
See the real CSS behind any Tailwind class, generated by Tailwind itself.
Tailwind Color to HEX Converter
Any Tailwind CSS colour class as HEX — v3 and v4 — or the nearest class for a HEX.
HEX to OKLCH Converter
HEX and RGB to the OKLCH colour space for modern CSS — and back, gamut-mapped.
RGB to CMYK Converter
Turn screen RGB values into CMYK ink percentages for print.
24-Hour to 12-Hour Converter
Turn 24-hour and military times into AM/PM, in bulk or inside text.
Percent to Fraction Converter
Move between percentages, decimals and fractions in any direction.
Email Format Validator
Check an email address against the rules that actually matter, and see why.
CSS Triangle Generator
Generate the border trick that makes triangles and tooltip arrows.
CSS Grid Generator
Draw a grid layout and get the CSS, including named template areas.
MIME Type Lookup
Find the MIME type for any file extension, or the extensions for a type.
My User Agent
See your own user agent string and what a server can tell from it.
User Agent Parser
Break a user agent string into browser, engine, operating system and device.
JWT Verifier
Check a JWT signature against a secret or a public key, and see why it fails.
JWT Generator
Build and sign a JWT with HS256, HS384 or HS512 for testing.
Unicode Code Point Lookup
Inspect any character: code point, block, category, UTF-8 bytes and escapes.
Markdown to HTML
Render Markdown to clean HTML, with tables, task lists and fenced code.
CSV to SQL
Turn a CSV export into INSERT statements, with column types inferred.
JSON to ENV
Flatten a JSON config into .env lines with correct quoting and naming.
JSON Schema Validator
Validate a JSON document against a draft-07 schema and see every failure by path.
JSON Sorter
Sort JSON object keys alphabetically at every level, or sort arrays by a field.
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