Mini Tools

Small single-purpose web tools that open instantly and run entirely in your browser. No sign-up, no upload, no waiting.

59 tools

All Mini Tools, searchable and sortable
TimerCount down from any time and get an alert when it reaches zero. Time & Date 98
LLM Token CounterCount tokens for a selected LLM model and see text statistics, context usage, and whether the result is exact or estimated. AI & LLM 96
Character CounterCount characters, words, lines and bytes in any text as you type. Text 95
QR Code ReaderRead a QR code from an image file, a dropped screenshot or your camera. Decoded in your browser, never uploaded. QR 94
LLM Cost CalculatorEstimate LLM input, cached-input, and output costs per request, batch, or month using sourced model pricing. AI & LLM 93
Digital ClockA large, readable clock showing the current time on your device. Time & Date 92
Table ConverterConvert a table between CSV, TSV, JSON, Markdown, HTML, SQL, XML, YAML, LaTeX, ASCII and more. Paste, drop a file, pick a target format. Developer 91
StopwatchMeasure elapsed time with lap times, accurate to a hundredth of a second. Time & Date 90
Context Window CalculatorCheck how system prompts, history, tool schemas, output, and safety margin fit within an LLM context window. AI & LLM 89
Age CalculatorWork out an exact age in years, months and days from a date of birth. Time & Date 88
JSON RepairRepair common JSON syntax problems locally, review every applied change, and compare the original with valid parsed output. Developer 87
Percentage CalculatorThree common percentage questions answered in one small form. Math 86
SQL INSERT GeneratorTurn CSV, TSV, JSON or a Markdown table into INSERT statements, with per-dialect identifier quoting and batching. Developer 85
Unit ConverterQuick conversions for the everyday length, mass, temperature and volume units. Conversion 84
Text ChunkerSplit text into overlapping chunks by tokens, characters, words, or paragraphs, then export as TXT, JSON, or JSONL. AI & LLM 83
Date CalculatorAdd or subtract days, weeks, months or years from a date. Time & Date 82
AI Text CleanerRemove selected Markdown markers and excess whitespace from AI-generated text without rewording its meaning. Text 81
NotepadA blank page to type on, saved in this browser until you clear it. Text 80
Markdown to TextConvert Markdown to readable plain text with three link modes, optional code removal, and tab-separated tables. Text 79
QR Code GeneratorTurn a link, Wi-Fi network, contact card or message into a QR code and download it as PNG or SVG. Generated in your browser, never uploaded. QR 78
Markdown Table to CSVConvert a Markdown pipe table to CSV and TSV with a safe DOM preview, configurable quoting, line endings, and BOM. Developer 77
Scientific CalculatorType a whole expression, with functions and parentheses, and get the answer. Math 76
Prompt FormatterBuild a structured prompt from nine fields or mechanically normalize an existing prompt without AI rewriting. AI & LLM 75
Random Number GeneratorDraw random whole numbers from a range, with or without repeats. Random 74
Prompt DiffCompare two prompts by characters, words, or lines with inline and side-by-side views plus exact change metrics. AI & LLM 73
Password GeneratorCreate a strong random password without it ever leaving your device. Random 72
JSON Schema ValidatorValidate JSON against a Draft 2020-12 schema locally and inspect every Ajv error path, keyword, and message. Developer 71
BMI CalculatorBody mass index from height and weight, in metric or imperial units. Math 70
Code Block ExtractorExtract fenced code blocks from Markdown, inspect language and size, then copy or download each block and a bulk Markdown export. Developer 69
CounterA tally counter you can click, tap or drive from the keyboard. Other 68
LaTeX Renderer & CleanerPreview LaTeX math and strip the fences and delimiters a chat answer wraps around it. Academic 67
Analog ClockA clean clock face showing the current time on your device. Time & Date 66
LLM VRAM CalculatorEstimate the GPU memory a model needs from its parameter count and precision. AI & LLM 65
World ClockCurrent time in several cities at once, side by side. Time & Date 64
LLM Quantization CalculatorCompare model weight size across FP32, FP16, INT8 and the low-bit formats. AI & LLM 63
Date Difference CalculatorDays, weeks and business days between two dates. Time & Date 62
Link ExtractorExtract bare HTTP links, Markdown links, and image URLs without fetching them; deduplicate, sort, inspect anchors, and export CSV. Text 61
Text Case ConverterConvert text to upper, lower, title, camel, snake or kebab case. Text 60
JSON ↔ YAML ConverterConvert JSON to YAML or YAML to formatted JSON locally with safe YAML 1.2 parsing, bounded aliases, and preserved key order. Developer 59
Remove SpacesStrip extra spaces, blank lines or all whitespace from text. Text 58
CSV to JSONL ConverterConvert local CSV or TSV data to JSONL with delimiter detection, optional headers, safe type inference, and a row preview. Developer 57
Remove Duplicate LinesKeep only the unique lines in a list, in their original order. Text 56
JSONL ValidatorValidate pasted or local JSONL line by line, count valid, invalid, and blank lines, and optionally require object keys. Developer 55
Sort LinesSort a list of lines alphabetically or numerically, ascending or descending. Text 54
JSON to TypeScriptInfer TypeScript interfaces or type aliases from JSON, including nested objects, merged array shapes, unions, nulls, and empty arrays. Developer 53
Text DiffCompare two blocks of text and see exactly which lines changed. Text 52
Token, Word & Character ConverterEstimate ranges when converting between tokens, words, and characters for English, Japanese, Chinese, Korean, or mixed text. AI & LLM 51
Base64 Encoder / DecoderConvert text to Base64 and back, including the URL-safe variant. Developer 50
JSON String Escape / UnescapeEscape or unescape JSON string content and copy the escaped body, complete literal, or JSON object example without damaging Unicode. Developer 49
HTML Table ExtractorFind every table in pasted HTML, pick the one you want, and export it as CSV, TSV, JSON, Markdown, SQL or an ASCII table. Developer 48
Embedding SimilarityCompare two existing numeric vectors with cosine similarity, dot product, Euclidean distance, and Manhattan distance. AI & LLM 47
ASCII Table GeneratorTurn CSV, TSV, JSON or a Markdown table into an aligned plain-text table for a README, a code comment or a terminal. Text 46
Base64 Image Encoder / DecoderTurn an image into a Base64 data URI and back, entirely in your browser. Image 45
Markdown to LaTeXConvert Markdown to LaTeX as a fragment or a complete document. Academic 43
LaTeX Table GeneratorTurn CSV or TSV into a LaTeX table with booktabs, a caption and per-column alignment. Academic 41
BibTeX Validator & CleanerFind structural errors in a .bib file and reformat it without touching the references. Academic 39
Vector Storage CalculatorEstimate the storage a vector collection needs, including metadata and replicas. AI & LLM 37
Image Aspect Ratio CalculatorSimplify width and height to a ratio, and work back to a missing dimension. Image 35
Image Size CalculatorFind dimensions for a target megapixel count, scale an image and see its raw memory. Image 33

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