Tous les outils utilitaires dont vous avez besoin, au même endroit
Rapides, privés, financés par la publicité et 100 % gratuits. Choisissez un outil ci-dessous ou utilisez la recherche.
Développeur (15)
Convertisseur de timestamp Unix gratuit — epoch, ISO 8601, fuseaux
Convertissez les timestamps Unix vers ISO 8601 et dates humaines dans n'importe quel fuseau IANA, instantanément. Heure courante en direct, copie en un clic. Tourne dans votre navigateur.
Convertisseur Markdown vers HTML en ligne gratuit — CommonMark + GFM
Convertissez du Markdown en HTML avec aperçu en direct. Supporte CommonMark et GitHub Flavored Markdown (tableaux, blocs de code, biffé). Copier ou télécharger. 100 % dans votre navigateur.
Encodeur et décodeur Base64 en ligne gratuit
Encodez du texte en Base64 ou décodez du Base64 en texte. Variante URL-safe supportée. Tout dans votre navigateur — sans upload, sans suivi.
Formateur, validateur et minifieur JSON en ligne gratuit
Formatez, validez, embellissez et minifiez du JSON dans votre navigateur. Rapide, gratuit, sans upload, sans suivi. Indentation, tri des clés et copie en un clic.
Free online CSS minifier — strip comments, whitespace, redundancies
Minify CSS in your browser. Removes comments, whitespace, last semicolons; collapses 0px to 0; shortens hex colours. Live byte-saving stats. No upload.
Free online CSV ↔ JSON converter — paste, parse, copy
Convert CSV to JSON or JSON to CSV in your browser. Custom delimiter, header row toggle, RFC 4180 quoting. Runs entirely in your browser.
Free online HTML minifier — strip comments, collapse whitespace
Minify HTML in your browser. Strip comments, collapse whitespace between tags, remove default attributes. Preserves <pre>, <script>, <style>. No upload.
Free online JS minifier — strip comments and whitespace
Minify JavaScript in your browser. Removes // and /* */ comments, collapses whitespace, preserves strings and regex literals. Live byte-saving stats. No upload.
Free online JWT decoder — inspect header, payload and claims
Decode JSON Web Tokens in your browser. See the header, payload and signature, with claim-by-claim breakdown and live expiry check. No upload, no tracking.
Free online text diff checker — compare two texts side by side
Compare two pieces of text and see exactly which lines were added, removed or kept. Ignore whitespace or case. Runs entirely in your browser, no upload.
Free online XML formatter and validator — pretty-print or minify
Format, validate and minify XML documents in your browser. Pretty-print with chosen indent, native parser validation, declaration preserved. No upload.
Free online YAML ↔ JSON converter — paste, convert, copy
Convert YAML to JSON or JSON to YAML in your browser. Live preview, indent options, validation. Useful for Kubernetes, GitHub Actions, Docker Compose configs.
Générateur d'UUID en ligne gratuit — v4, v7 et nil
Générez des UUID v4 cryptographiquement aléatoires, des UUID v7 triables par le temps ou l'UUID nil instantanément dans votre navigateur. Génération en bulk jusqu'à 100 IDs. Sans upload, sans suivi.
Générateur de hash en ligne gratuit — SHA-1, SHA-256, SHA-384, SHA-512
Calculez les hashs SHA-1, SHA-256, SHA-384 et SHA-512 de n'importe quel texte instantanément. Propulsé par l'API Web Crypto native du navigateur. Sans upload, sans suivi.
Testeur de regex en ligne gratuit — playground regex JavaScript
Testez vos expressions régulières JavaScript dans votre navigateur. Matchs en direct, groupes de capture, aperçu de remplacement et bibliothèque de patterns courants. Sans upload, sans suivi.
Web & SEO (6)
Encodeur et décodeur d'URL en ligne gratuit
Encodez du texte au format pourcent pour inclusion sécurisée dans une URL, ou décodez. Mode Composant ou URL complète. 100 % dans votre navigateur, sans upload.
Free online HTML entity encoder and decoder
Encode special characters as HTML entities or decode them back to plain text. Minimal, named or full numeric encoding. Runs entirely in your browser.
Free online HTML meta tag generator — SEO, Open Graph, Twitter Card
Generate SEO meta tags, Open Graph tags, Twitter Card tags and canonical link from a single form. Copy ready-to-paste HTML for your <head>. Runs in your browser.
Free online robots.txt generator — block AI crawlers, allow Google
Build a robots.txt visually. Allow Googlebot, block GPTBot/ClaudeBot/CCBot, set sitemap and crawl-delay. Copy ready-to-paste output for your domain root.
Free online slug generator — clean URL slugs from any title
Turn any title into a clean URL slug: lowercase, accents stripped, separator of your choice, max length capped. Runs in your browser, no upload.
Free online XML sitemap generator — sitemap.xml from URL list
Paste your site's URL list, set change-frequency and priority, get a valid sitemap.xml ready to upload. Sitemaps Protocol 0.9 compliant. Runs in your browser.
Design (7)
Convertisseur de couleurs en ligne — HEX, RGB, HSL, HSV
Convertissez instantanément n'importe quelle couleur entre HEX, RGB, HSL et HSV. Aperçu en direct, sélecteur natif, copie en un clic. 100 % dans le navigateur, sans upload.
Convertisseur de format d'image en ligne gratuit — JPG, PNG, WEBP
Convertissez entre JPG, PNG et WEBP dans votre navigateur. Sans upload, sans suivi — l'image reste sur votre appareil. Qualité ajustable, téléchargement instantané.
Free online color palette generator — harmony schemes from any base
Generate harmonious colour palettes from any base hex: analogous, complementary, triadic, tetradic, monochromatic, shades. Copy as hex or HSL.
Free online CSS border-radius generator — independent corners
Design rounded shapes with independent control of all four corners, in pixels or percent. Live preview, ready-to-paste CSS. No sign-up.
Free online CSS box-shadow generator — multi-layer, inset, presets
Design CSS box-shadows with up to four stacked layers, live preview and ready-to-paste rule. Inset, presets, custom colors. No upload, no sign-up.
Free online CSS gradient generator — linear and radial
Design linear and radial CSS gradients with up to six colour stops. Live preview, ready-to-paste CSS, presets included. No sign-up, no upload.
Free online WCAG contrast checker — AA & AAA pass/fail
Compare two colours, see the WCAG contrast ratio and AA/AAA pass/fail for normal and large text. Live preview, ready for accessibility audits.
Calculatrices (7)
Free online BMI calculator — metric and imperial units
Compute your Body Mass Index instantly in metric (kg/cm) or imperial (lb/ft·in). WHO category, healthy weight range. Runs in your browser, no tracking.
Free online IPv4 CIDR calculator — subnet, mask, hosts, RFC 1918
Paste any IPv4/CIDR (192.168.1.0/24) and instantly see network, broadcast, mask, wildcard, host range, total and usable hosts, plus private/public detection.
Free online loan calculator — monthly payment and amortisation
Compute monthly payment, total interest and full amortisation schedule for any fixed-rate loan. Mortgage, car, personal. Multi-currency, in your browser.
Free online mortgage calculator — payment, taxes and insurance
Compute the full monthly mortgage payment: principal + interest + property tax + home insurance. Down payment slider, multi-currency. Runs in your browser.
Free online number base converter — binary, octal, decimal, hex, any base 2-36
Convert numbers between binary, octal, decimal, hex and any custom base from 2 to 36. BigInt-powered for huge numbers. Runs entirely in your browser.
Free online tip calculator — split bill across people, multi-currency
Calculate restaurant tip and split the total across any number of people. Tip presets (10-25%), custom percentage, multi-currency. Runs in your browser.
Free online unit converter — length, weight, temperature, more
Convert between metric and imperial units across 7 categories: length, weight, area, volume, speed, time, temperature. Live conversion in your browser.
Aléatoire & Décisions (5)
Free online coin flip — heads or tails, animated, fair RNG
Flip a coin online — animated heads or tails, exact 50/50 fairness using cryptographic randomness. Batch flip 10 or 100 with running statistics.
Free online dice roller — d4 d6 d8 d10 d12 d20 d100 with modifier
Roll any tabletop dice in your browser: d4 to d100, multiple dice at once, optional modifier. Cryptographically secure, fair distribution. Roll history.
Free online list shuffler — randomise any list, pick subset, dedupe
Paste any list, get it randomly reordered with Fisher-Yates and a cryptographic RNG. Optionally dedupe and pick a random subset of N items.
Free online random number generator — secure, unbiased, batchable
Generate random integers in any range, single or in batches up to 1000, optionally unique. Cryptographically secure (Web Crypto API). Runs in your browser.
Générateur de mot de passe en ligne gratuit — fort, aléatoire, sécurisé
Générez des mots de passe aléatoires cryptographiquement forts. Personnalisez la longueur et les classes de caractères. 100 % dans votre navigateur, jamais transmis, jamais stocké.
Productivité (5)
Free online countdown timer — to any date and time
Live countdown to any future date and time. Days, hours, minutes, seconds. Custom event label. Runs entirely in your browser, no sign-up.
Free online NATO phonetic alphabet converter — Alfa Bravo Charlie
Convert any text or word into the NATO phonetic alphabet (Alfa, Bravo, Charlie…). Useful for radio communication, support tickets, spelling on the phone.
Free online Pomodoro timer — 25/5 focus and break cycles
Run Pomodoro focus sessions in your browser: 25-minute focus, 5-minute breaks, 15-minute long break every 4 sessions. Audio cue at end of each phase.
Free online word counter — words, characters, reading time
Count words, characters (with and without spaces), sentences, paragraphs, lines plus reading and speaking time, live as you type. No upload, no tracking.
Générateur de Lorem Ipsum en ligne gratuit — paragraphes, phrases, mots
Générez du texte placeholder Lorem Ipsum. Choisissez paragraphes, phrases ou mots. Option « commence par Lorem ipsum ». Copie en un clic. 100 % dans votre navigateur.
Texte & Données (5)
Free online cron expression builder — schedule, parse, preview
Build cron expressions visually, see human-readable description and the next 5 fire times. 5-field POSIX format. Runs entirely in your browser.
Free online email validator — syntax check, typo fix, dedupe
Paste a list of email addresses, see which are syntactically valid, get suggested fixes for common domain typos (gmial.com → gmail.com), dedupe. No upload.
Free online Markdown table generator — visual editor
Build Markdown tables visually: edit cells in a grid, choose alignment per column, add/remove rows and columns. Copy GFM-compatible output. No upload.
Free online text case converter — camelCase, snake_case, kebab-case, more
Convert text between 12 cases: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, iNVERSE.
Générateur de QR code en ligne gratuit — texte, URL, couleurs personnalisées
Générez un QR code pour n'importe quel texte ou URL. Personnalisez taille, couleurs et correction d'erreur. Téléchargement PNG. 100 % dans le navigateur, sans upload, sans compte.