{"id":9593,"date":"2026-01-10T14:54:29","date_gmt":"2026-01-10T06:54:29","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/"},"modified":"2026-01-10T14:54:29","modified_gmt":"2026-01-10T06:54:29","slug":"what-is-a-png-file","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/","title":{"rendered":"Qu&#8217;est-ce qu&#8217;un fichier PNG ?"},"content":{"rendered":"<h1>Qu&#8217;est-ce qu&#8217;un fichier PNG ?<\/h1>\n<p>PNG est un type de format de fichier tr\u00e8s populaire \u00e0 utiliser aujourd&#8217;hui. Le nom complet de PNG est <a href=\"https:\/\/www.techtarget.com\/whatis\/definition\/PNG-Portable-Network-Graphics\">Graphics r\u00e9seau portables<\/a>, c&#8217;est un format de fichier graphique raster qui prend en charge la compression sans perte de donn\u00e9es. PNG prend en charge les images en couleur compl\u00e8te non bas\u00e9es sur une palette <a href=\"https:\/\/www.nixsensor.com\/blog\/what-is-rgb-color\/\" rel=\"noopener noreferrer\" target=\"_blank\">RVB<\/a> ou RGBA ainsi que les images bas\u00e9es sur une palette (palettes avec des couleurs RVB \u00e0 24 bits ou RGBA \u00e0 32 bits), canal alpha avec ou sans transparence, et images en nuances de gris. Les espaces colorim\u00e9triques non RVB comme <a href=\"https:\/\/www.printingcenterusa.com\/blog\/what-is-cmyk-and-why-is-it-used-for-printing\/\" rel=\"noopener noreferrer\" target=\"_blank\">CMJN<\/a> ne sont pas pris en charge car le groupe de travail PNG a con\u00e7u ce format pour le transfert d&#8217;images sur Internet plut\u00f4t que pour les graphiques imprim\u00e9s de haute qualit\u00e9.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-10771 size-full\" decoding=\"async\" height=\"421\" loading=\"lazy\" sizes=\"auto, (max-width: 582px) 100vw, 582px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1.png 582w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1-300x217.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1-150x109.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1-400x289.png 400w\" width=\"582\"\/><\/p>\n<h1>Caract\u00e9ristiques du format PNG<\/h1>\n<h3><strong><span class=\"mw-headline\" id=\"Transparency_of_image\">Transparence de l&#8217;image<\/span><\/strong><\/h3>\n<ul>\n<li>Vous pouvez facilement d\u00e9finir un fond transparent pour le format PNG. PNG propose de nombreuses options de transparence. Les valeurs individuelles des pixels pour les images en couleur r\u00e9elle et en nuances de gris peuvent \u00eatre d\u00e9finies comme transparentes, ou un canal alpha peut \u00eatre ajout\u00e9 (permettant tout pourcentage de transparence partielle). La valeur alpha peut \u00eatre ajout\u00e9e \u00e0 l&#8217;entr\u00e9e de la palette pour les images qui ont \u00e9t\u00e9 palettis\u00e9es.<\/li>\n<\/ul>\n<h3><strong><span class=\"mw-headline\" id=\"Animation\">Animation<\/span><\/strong><\/h3>\n<ul>\n<li>L&#8217;animation n&#8217;est pas prise en charge nativement par PNG.<a href=\"https:\/\/en.wikipedia.org\/wiki\/Multiple-image_Network_Graphics#:~:text=Multiple%2Dimage%20Network%20Graphics%20(MNG,free%20software%20reference%20implementations%20available.\" rel=\"noopener noreferrer\" target=\"_blank\"> MNG<\/a> a \u00e9t\u00e9 cr\u00e9\u00e9 par des membres du groupe PNG et est une extension de PNG. MNG a une structure de base similaire \u00e0 PNG et utilise de nombreux \u00e9l\u00e9ments de construction similaires, mais il est bien plus complexe et dispose d&#8217;une signature de fichier distincte, ce qui le rend incompatible avec les d\u00e9codeurs PNG utilis\u00e9s par la plupart des navigateurs ou applications en ligne.<\/li>\n<\/ul>\n<h3><strong><span class=\"mw-headline\" id=\"Pixel_format\">Format des pixels<\/span><\/strong><\/h3>\n<ul>\n<li>Les nombres qui composent les pixels dans les images PNG peuvent \u00eatre soit des indices dans les donn\u00e9es d&#8217;\u00e9chantillonnage de la palette, soit les donn\u00e9es d&#8217;\u00e9chantillonnage elles-m\u00eames. Le bloc PLTE contient un tableau distinct appel\u00e9 palette. Les donn\u00e9es d&#8217;\u00e9chantillonnage d&#8217;un seul pixel sont compos\u00e9es de tuples de un \u00e0 quatre nombres. Chaque entier de l&#8217;image est encod\u00e9 selon la m\u00eame structure, ind\u00e9pendamment du fait que les donn\u00e9es du pixel repr\u00e9sentent un index de palette ou une valeur d&#8217;\u00e9chantillonnage explicite.<\/li>\n<\/ul>\n<h1><span class=\"mw-headline\" id=\"Advantages\">Avantages<\/span> du PNG<\/h1>\n<h3><strong>Efficacit\u00e9<\/strong><\/h3>\n<ul>\n<li>En termes d&#8217;efficacit\u00e9, PNG est efficace dans le d\u00e9codage et le rendu pour tout rendu progressif d&#8217;image, compression et filtrage<\/li>\n<\/ul>\n<h3><strong>Flexibilit\u00e9<\/strong><\/h3>\n<ul>\n<li>En termes de flexibilit\u00e9, les ajouts futurs et les extensions priv\u00e9es sont autoris\u00e9s sans modifier la phrase pr\u00e9c\u00e9dente.<\/li>\n<\/ul>\n<h3><strong>Compl\u00e9tude<\/strong><\/h3>\n<ul>\n<li>Il peut repr\u00e9senter des images en couleur r\u00e9elle, en couleur index\u00e9e et en nuances de gris.<\/li>\n<\/ul>\n<h3><strong>Compression<\/strong><\/h3>\n<ul>\n<li>Vous pouvez compresser le PNG de mani\u00e8re efficace et coh\u00e9rente.<\/li>\n<\/ul>\n<h3><strong>Libert\u00e9 de restrictions l\u00e9gales<\/strong><\/h3>\n<ul>\n<li>Les algorithmes utilis\u00e9s sont libres et accessibles aux personnes.<\/li>\n<\/ul>\n<p><img alt=\"\" class=\"alignnone wp-image-10773 size-full\" decoding=\"async\" height=\"421\" loading=\"lazy\" sizes=\"auto, (max-width: 581px) 100vw, 581px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-01.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-01.png 581w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-01-300x217.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-01-150x109.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-01-400x290.png 400w\" width=\"581\"\/><\/p>\n<h1><span class=\"mw-headline\" id=\"Comparison_with_other_file_formats\">Comparer avec d&#8217;autres formats de fichiers<\/span><\/h1>\n<h3><strong><span class=\"mw-headline\" id=\"Graphics_Interchange_Format_(GIF)\">Format d&#8217;\u00e9change d&#8217;images (GIF)<\/span><\/strong><\/h3>\n<ul>\n<li>Pour la plupart des images, un <a href=\"https:\/\/www.howtogeek.com\/441185\/what-is-a-gif-and-how-do-you-use-them\/\" rel=\"noopener noreferrer\" target=\"_blank\">GIF<\/a>fichier a une taille plus grande qu&#8217;une image PNG index\u00e9e.<\/li>\n<li>PNG offre une gamme bien plus large d&#8217;options de transparence que le GIF<\/li>\n<li>Lors de la conversion d&#8217;une image au format PNG vers GIF, la qualit\u00e9 de l&#8217;image peut \u00eatre affect\u00e9e<\/li>\n<\/ul>\n<h3><strong><span class=\"mw-headline\" id=\"JPEG\">JPEG<\/span><\/strong><\/h3>\n<ul>\n<li>Le format PNG peut compresser les donn\u00e9es d&#8217;image plus que le JPEG<\/li>\n<li>Le JPEG ne prend pas en charge la transparence<\/li>\n<\/ul>\n<h3><strong><span class=\"mw-headline\" id=\"TIFF\">TIFF<\/span><\/strong><\/h3>\n<ul>\n<li>Le PNG ne prend en charge que l&#8217;alpha non pr\u00e9multipli\u00e9, tandis que <a href=\"https:\/\/www.widen.com\/blog\/whats-the-difference-between-png-jpeg-gif-and-tiff\" rel=\"noopener noreferrer\" target=\"_blank\">TIFF<\/a> prend \u00e9galement en charge l&#8217;alpha pr\u00e9multipli\u00e9.<\/li>\n<\/ul>\n<h3><strong><span class=\"mw-headline\" id=\"JPEG-LS\">JPEG-LS<\/span><\/strong><\/h3>\n<ul>\n<li>JPEG-LS se comporte g\u00e9n\u00e9ralement mieux que PNG<\/li>\n<li>Les formats PNG et JPEG-LS sont tous deux des options, et la taille du fichier est un crit\u00e8re important<\/li>\n<\/ul>\n<p><img alt=\"\" class=\"alignnone wp-image-10774 size-full\" decoding=\"async\" height=\"421\" loading=\"lazy\" sizes=\"auto, (max-width: 581px) 100vw, 581px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-03.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-03.png 581w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-03-300x217.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-03-150x109.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-03-400x290.png 400w\" width=\"581\"\/><\/p>\n<h1>Convertir les PNG en PDF<\/h1>\n<p>Sur la fa\u00e7on de convertir un PNG en PDF. C&#8217;est simple. Vous pouvez simplement acc\u00e9der aux services en ligne d&#8217;Adobe Acrobat \u00e0 l&#8217;aide de tout navigateur web, puis trouver la page de conversion JPG en PDF. Pour t\u00e9l\u00e9charger un fichier image, faites glisser le fichier dans la zone de d\u00e9p\u00f4t ou cliquez sur le bouton \u00ab S\u00e9lectionner un fichier \u00bb.<\/p>\n<h1>\u00c9ditez les documents PDF avec l&#8217;\u00e9diteur PDF gratuit en ligne de Visual Paradigm<\/h1>\n<p>Visual Paradigm propose d\u00e9sormais une nouvelle fonctionnalit\u00e9 pour \u00e9diter les PDF. Vous pouvez facilement t\u00e9l\u00e9charger tout fichier PDF et le modifier. Il est facile \u00e0 utiliser pour tout le monde afin de personnaliser le PDF original selon vos besoins, comme modifier le contenu, ajouter des images, des tableaux\/graphiques ou d&#8217;autres \u00e9l\u00e9ments de design. Vous pouvez cliquer sur <a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\" rel=\"noopener noreferrer\" target=\"_blank\">ici<\/a> pour d\u00e9couvrir l&#8217;\u00e9diteur PDF gratuit en ligne de VP.<\/p>\n<p>Dans VP Online, vous pouvez utiliser l&#8217;onglet T\u00e9l\u00e9charger PDF ci-dessus pour soumettre votre fichier PDF. Vous pouvez s\u00e9lectionner un fichier depuis vos lecteurs en ligne, y compris Google Drive, Dropbox, ou faire glisser et d\u00e9poser un fichier.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-10776 size-full\" decoding=\"async\" height=\"375\" loading=\"lazy\" sizes=\"auto, (max-width: 792px) 100vw, 792px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4.png 792w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4-300x142.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4-768x364.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4-150x71.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5337-4-400x189.png 400w\" width=\"792\"\/><\/p>\n<p>Le texte et les images du document peuvent tous deux \u00eatre modifi\u00e9s. Double-cliquez sur la forme de texte pour ajuster les param\u00e8tres du contenu et de la police. S\u00e9lectionnez une forme ou une image pour l&#8217;\u00e9dition, puis apportez des ajustements comme redimensionner, ajouter des effets, etc.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-9592 size-full\" decoding=\"async\" height=\"226\" loading=\"lazy\" sizes=\"auto, (max-width: 816px) 100vw, 816px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1.png 816w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1-300x83.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1-768x213.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1-150x42.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1-400x111.png 400w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/Screenshot-5335-1-705x195.png 705w\" width=\"816\"\/><\/p>\n<p>Une fois votre \u00e9dition termin\u00e9e, vous pouvez partager le PDF r\u00e9vis\u00e9 en ligne ou le t\u00e9l\u00e9charger. Il est facile pour tout le monde d&#8217;\u00e9ditionner des PDF avec <a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">l&#8217;\u00e9diteur PDF en ligne de Visual Paradigm<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qu&#8217;est-ce qu&#8217;un fichier PNG ? PNG est un type de format de fichier tr\u00e8s populaire \u00e0 utiliser aujourd&#8217;hui. Le nom complet de PNG est Graphics r\u00e9seau portables, c&#8217;est un format de fichier graphique raster qui prend en charge la compression sans perte de donn\u00e9es. PNG prend en charge les images en couleur compl\u00e8te non bas\u00e9es [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":9594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[48],"tags":[],"class_list":["post-9593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-flipbook-maker","loop-entry","clr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce qu&#039;un fichier PNG ? - Visual Paradigm Blog Fran\u00e7ais<\/title>\n<meta name=\"description\" content=\"PNG is a type of file format that is very popular to use today. The full name of PNG is Portable Network Graphics, it is is a raster-graphics file format that supports lossless data compression.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu&#039;est-ce qu&#039;un fichier PNG ? - Visual Paradigm Blog Fran\u00e7ais\" \/>\n<meta property=\"og:description\" content=\"PNG is a type of file format that is very popular to use today. The full name of PNG is Portable Network Graphics, it is is a raster-graphics file format that supports lossless data compression.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/\" \/>\n<meta property=\"og:site_name\" content=\"Visual Paradigm Blog Fran\u00e7ais\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-10T06:54:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1.png\" \/><meta property=\"og:image\" content=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"582\" \/>\n\t<meta property=\"og:image:height\" content=\"421\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"vpleanda\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/12-02-1.png\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"vpleanda\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/\",\"url\":\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/\",\"name\":\"Qu'est-ce qu'un fichier PNG ? - Visual Paradigm Blog Fran\u00e7ais\",\"isPartOf\":{\"@id\":\"https:\/\/blog.visual-paradigm.com\/fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.visual-paradigm.com\/fr\/what-is-a-png-file\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.visual-paradigm.com\/fr\/wp-content\/uploads\/sites\/9\/2026\/01\/12-02-1.png\",\"datePublished\":\"2026-01-10T06:54:29+00:00\",\"dateModified\":\"2026-01-10T06:54:29+00:00\",\"author\":{\"@id\":\"https:\/\/blog.visual-paradigm.com\/fr\/#\/schema\/person\/6acd2305b60fa353e87c4c7d9eba4039\"},\"description\":\"PNG is a type of file format that is very popular to use today. 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