FreeToolkit · 32 free online tools
Every tool runs locally in your browser. No uploads, no sign-up, no file size limit.
Image Compressor (Runs in Your Browser)Compress JPG, PNG and WebP to a target file size - nothing is uploaded to a serverImage Format Converter (JPG / PNG / WebP)Batch convert to WebP to save space, or to PNG to keep transparencyJSON Formatter, Minifier and ValidatorPaste JSON and format it instantly; errors point to the exact line and columnBase64 Encoder and Decoder (UTF-8 Safe)Handles UTF-8 and non-ASCII text correctly, with no mojibakeSHA-1 / SHA-256 / SHA-512 Hash GeneratorUses the browser's native crypto - your input never leaves your deviceCSV to JSON and JSON to CSV ConverterRFC 4180 CSV parsing that keeps quoted commas and newlines on the right rowMarkdown to HTML ConverterHeadings, lists, code blocks, tables and links - output ready to pasteRemove Duplicate Lines, Sort and CountTens of thousands of lines processed instantly - dedupe, sort, find duplicatesUnix Timestamp ConverterAuto-detects seconds or milliseconds and shows both local and UTC timePercentage CalculatorGrowth, discount, share and markup calculated in one goLoan Amortization Calculator (Monthly Payment)Equal-payment monthly instalment, total interest and total repaymentBMI and BMR CalculatorHeight, weight and age to BMI category, basal metabolic rate and daily caloriesDate Difference and Age CalculatorDays between two dates, converted into years, months and daysUnit Converter (Length, Weight, Temperature)Convert length, weight and temperature in one placeCron ExplainerTurn a cron expression into plain English plus the next five run times.Regex TesterRun a JavaScript regular expression against sample text and see every match with its groups.Colour ConverterConvert HEX, RGB, HSL and HSV and check WCAG contrast against black and white.JWT DecoderDecode a JSON Web Token header and payload locally and read its expiry as a real date.Text DiffCompare two blocks of text line by line and see exactly what was added or removed.URL EncoderPercent-encode or decode text with both encodeURIComponent and encodeURI, plus a query-string table.UUID GeneratorGenerate batches of RFC 4122 version 4 UUIDs using the browser crypto API.Password StrengthMeasure password entropy in bits, estimate cracking time, and flag weak patterns.Base ConverterConvert between binary, octal, decimal and hex with no size limit using BigInt.Markdown PreviewRender Markdown to clean HTML with headings, lists, tables, code and safe escaping.QR Code GeneratorEncode any text or URL into a real QR code and download it as a clean SVG.Image ResizerResize any image by pixels or percent in the browser and export PNG, JPEG or WebP.JSON-LD Generator (schema.org structured data)Build valid schema.org JSON-LD for Article, Product, FAQ, Breadcrumb and more — with the exact tag to paste, and a warning for each mistake that costs you the rich result.Security Headers GeneratorBuild the exact HSTS, CSP, Referrer-Policy and Permissions-Policy config for nginx, Caddy, Netlify, Next.js or Apache — and get warned about the settings that break a live site.SERP Snippet CheckerSee exactly where Google will cut your title and meta description, measured in pixels rather than characters — and get the corrected tags to paste.Image Alt AuditorPaste one page of HTML and get every image that fails the alt check, split into real WCAG errors and cosmetic warnings, with paste-ready fixes.Sitemap BuilderPaste the URLs you already have and get a valid sitemap.xml plus robots.txt, with duplicates, cross-host URLs and bad dates caught before upload.llms.txt GeneratorTurn your page list into a valid llms.txt — correct H1, blockquote summary, absolute URLs, and every bad line called out by number.
Packs
The tools are free forever. If you want finished, commercial-ready assets — icon sets, spreadsheets, prompt libraries, editing presets — those are what I build and sell.
Free site audit
Send me your URL and a bot scores it against 15 fixed checks, posts the ones that failed, and publishes a report page you can share. Free, no signup.