10 new AI & LLM tools
A quiet workspace of professional tools.
46 focused utilities for developers and writers. Everything runs in your browser — nothing is uploaded, nothing is stored.
46 tools100% client-sideNo sign-up
Popular4
JWT InspectorDecode a JWT into header, payload and signature with expiry highlighting.
Regex PlaygroundTest regular expressions live with match highlighting and capture groups.
PDF MergeCombine multiple PDFs into one, reordering pages before merging.
Password GeneratorGenerate strong passwords with entropy estimates and bulk mode.
Developer6
JWTs, regex, diffs and everyday coding helpers.
JWT InspectorDecode a JWT into header, payload and signature with expiry highlighting.
Regex PlaygroundTest regular expressions live with match highlighting and capture groups.
UUID GeneratorGenerate UUID v4 and NanoID identifiers in bulk.
Cron BuilderBuild cron expressions with a human-readable schedule and next run times.
Diff CheckerCompare two texts line by line with added and removed highlighting.
API Response FormatterPretty-print and minify JSON or XML with syntax highlighting.
Documents5
PDF, Markdown and writing utilities.
PDF MergeCombine multiple PDFs into one, reordering pages before merging.
PDF SplitExtract selected page ranges from a PDF into a new file.
Image to PDFTurn multiple images into a single ordered PDF document.
Markdown EditorWrite Markdown with a live HTML preview and export.
Word CounterCount words, characters, reading time and top word frequencies.
Conversion6
Translate between data formats and encodings.
JSON ⇄ YAMLConvert between JSON and YAML in both directions.
JSON ⇄ CSVConvert a JSON array to CSV and back with auto headers.
Base64 EncoderEncode and decode text or files to and from Base64.
URL EncoderPercent-encode and decode URLs with a breakdown of changes.
Color ConverterConvert colors between HEX, RGB, HSL and CMYK.
Number Base ConverterConvert numbers between decimal, binary, hex and octal.
Security4
Passwords, hashing and content security policies.
Password GeneratorGenerate strong passwords with entropy estimates and bulk mode.
Password Strength AnalyzerEstimate entropy, crack time and weaknesses of a password.
Hash GeneratorCompute SHA-256, SHA-512 and MD5 hashes of text or files.
CSP BuilderBuild a Content-Security-Policy header with a live preview.
Finance6
Loans, invoices, splits and quick math.
Loan CalculatorCalculate EMI, total interest and a full amortization schedule.
Expense SplitterSplit shared expenses and compute minimal settlement transfers.
Invoice GeneratorCreate an invoice with live preview and download it as a PDF.
Tip CalculatorCalculate tip, total and per-person amounts instantly.
Percentage CalculatorFive percentage modes for everyday math.
Unit ConverterConvert length, weight, temperature, speed, area and data.
Image5
Resize, compress, convert and inspect images.
Image ResizerResize images with optional aspect-ratio lock and export.
Image CompressorCompress images and compare original vs compressed size.
Image ConverterConvert images between PNG, JPEG, WebP and BMP.
Color ExtractorExtract the dominant colors from an uploaded image.
Favicon GeneratorGenerate favicon sizes from one image and download a ZIP.
Text4
Transform, generate and clean up text.
AI & LLM10
Tokens, prompts, model pricing and LLM tooling.
Token Counter & CostNewCount tokens and estimate API cost live across any model.
LLM Model ComparatorNewFilter and sort every model by price, context and capability.
Prompt FormatterNewConvert prompts between Claude XML, OpenAI, ChatML and Llama formats.
System Prompt LinterNewScore a system prompt and surface issues with rule-based checks.
JSON Schema BuilderNewBuild LLM tool-calling schemas in OpenAI and Anthropic formats.
AI API Cost EstimatorNewProject AI spend per day, month and year with cheaper alternatives.
Image to Base64 (Vision)NewFormat an image as a vision-API payload for OpenAI or Anthropic.
Text Similarity AnalyzerNewCompare texts with a TF-IDF cosine similarity matrix in the browser.
AI Rules File GeneratorNewGenerate CLAUDE.md, .cursorrules, .windsurfrules and Copilot files.
Prompt Version DiffNewDiff two prompt versions with token deltas and structural changes.