Reference tables
Lookup pages worth bookmarking: values, codes, and syntax in one place.
No signup, no trackingA tool does the work for you. A reference page just tells you what the value is. These are the lookup tables worth keeping open in a tab: the expression, the code, or the name, with its plain-English meaning right next to it.
Every page here is plain HTML, with no script touching your data and no signup to read it. And if you would rather run the conversion than look it up, each table links straight to the tool that does it.
All reference pages
Cron Expression Examples84 crontab schedules with the exact times each one fires.Unix Timestamp Reference: Epoch Values and ConversionsNotable epoch values, per-database SQL conversions and the 2038 limits.Regex Cheat Sheet: Syntax Tables and Ready-Made PatternsRegex syntax in tables, plus patterns tested before publishing.HTML Entities List192 characters with their named, decimal and hexadecimal codes.CSS Color Names, Hex and RGB CodesAll 148 CSS color keywords with hex, RGB and HSL values.Binary, Octal, Decimal and Hex Conversion TableBinary, octal, decimal and hex side by side, from 0 to 65536.Social Media Image Sizes — 2026 Cheat SheetEvery platform dimension in one table: Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest and Threads.Favicon Sizes — Complete Cheat SheetEvery favicon size that matters in 2026 — and the four files that cover them all.UTM Parameters — Complete ReferenceThe five parameters, the source/medium conventions, and how GA4 turns them into channels.Words per Minute — Speech Length TableHow many words fit in a speech of any length, from 30 seconds to an hour, at three speaking paces.ASCII Table — Complete 0–127 ReferenceEvery ASCII character with its decimal, binary, hexadecimal and octal value — plus the control codes.Margin vs Markup Chart — Conversion Table & FormulasEvery markup percentage converted to its margin — and the two formulas everybody confuses.Z-Score Table — Standard Normal DistributionLook up the area to the left of any z-score, positive or negative, to four decimal places.
Tools these tables pair with
URL Encode / DecodePercent-encode or decode URLs and query strings.Unix Timestamp ConverterConvert Unix epochs to human dates and back.Hash Generator (SHA-256, SHA-512)Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes.Word CounterWords, characters, sentences, and reading time — live.URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug.Regex TesterTest JavaScript regular expressions with live highlighting and groups.Cron Expression ParserExplain any crontab schedule and preview its next run times.Text Diff CheckerCompare two texts line by line and spot every change.QR Code GeneratorCreate QR codes — no watermark, no sign-in, no tracking, no expiration.Color Converter (HEX, RGB, HSL)Convert any CSS color between HEX, RGB, and HSL with a live preview.Number Base ConverterConvert between binary, octal, decimal, hex, and any base up to 36.HTML Entity Encoder / DecoderEscape or unescape HTML entities instantly as you type.Favicon Generator (ICO + PNG)Turn any image into a multi-size favicon.ico plus PNG icons.Resize Image to Any SizeSet an exact width and height, scale by percent, or fit within a box — one photo or a whole folder, without a single upload.Crop an Image — Rectangle, Circle & ShapesDrag a crop box or mask a perfect circle, and download a PNG whose corners are actually transparent.Convert SVG to PNGRasterize a vector at any pixel size, with transparency kept — no upload.Percent Change CalculatorFind the percent change between an old and a new value — signed, with an increase or decrease label — plus the absolute change, the symmetric percent difference, and the Excel, Sheets, and SQL formulas.Margin & Markup CalculatorCalculate profit margin, markup percentage, and profit from cost and revenue.Character CounterCount characters and see how your text fits X, Instagram, YouTube, Google Ads, and more.UTM Link BuilderBuild Google Analytics campaign URLs with UTM parameters — instantly.Readability Score CheckerFlesch-Kincaid, Gunning Fog, and Coleman-Liau scores — instantly.ROI CalculatorCalculate return on investment, net profit, and annualized ROI — instantly.Break-Even CalculatorHow many units to sell — or how much revenue to earn — to cover all costs.Speaking Time EstimatorPaste your text and see how long it takes to speak or read.Open Graph PreviewPaste meta tags and preview social media share cards.Social Media Image ResizerResize images for Instagram, Facebook, Twitter, LinkedIn, YouTube.Descriptive Statistics CalculatorMean, median, mode, standard deviation, variance, quartiles — from any dataset.Weighted Average CalculatorEnter values and weights to get the weighted mean instantly.Z-Score CalculatorCalculate z-score from value, mean, and standard deviation — with percentile lookup.