Convertir le format d'image API
Fonctionnement de ce point de terminaison : Le PDF4me Convertir le format d'image REST API convertit les images entre JPG, PNG, WebP, BMP, GIF et TIFF formats dans un seul POST appel. Envoyez votre image source sous forme d'appel. Base64-chaîne encodée, spécifiez le format actuel et le format cible, et recevez en retour l'image convertie, également sous forme de Base64Utilisez-le pour standardiser les formats d'image tout au long d'une chaîne de traitement, convertir les anciens fichiers BMP ou TIFF fichiers pour la diffusion Web, ou préparez les images avant de les traiter via le point de terminaison Compress Image.
Authentification de votre API Demande
Chaque PDF4me REST API L'appel doit inclure votre API clé dans le Authorization En-tête. Récupérez votre clé depuis le tableau de bord développeur et ne la mentionnez pas dans le code côté client.
Informations importantes à ne pas manquer
docName, docContent, CurrentImageFormat, and NewImageFormat must all be present. A missing format parameter causes the API to return a 400 error. Always provide both format fields explicitly: do not assume the API will infer the source format from the file extension in docName.
The API uses CurrentImageFormat to select the correct decoding codec. If you send a PNG file but set CurrentImageFormat to JPG, decoding fails with a format error. Read the real format from your source file MIME type or binary header: never derive it solely from the filename extension, which can be wrong.
JPG does not support an alpha channel. Transparent areas in a PNG or GIF source are filled with white (or a default background) during JPG conversion. If your image has a transparent background: logos, cut-out product photos, icons, convert to PNG, GIF, or BMP instead of JPG to preserve the transparency.
REST API Point de terminaison
| Méthode | Point de terminaison |
|---|---|
| POST | /api/v2/ConvertImageFormat |
URL de base : https://api.pdf4me.com
Paramètres
⚠️ Les quatre paramètres sont requis. Le API renvoie une erreur si un champ est manquant.
| Paramètre | Requis | Taper | Ce que cela fait | Exemple |
|---|---|---|---|---|
| docName | Required | String | Filename of the source image including the file extension. Used for output file naming. Should reflect the actual format of the source file. | company-logo.png |
| docContent | Required | Base64 | The complete source image file encoded as a Base64 string. Maximum file size: 50 MB. Do not include a data URL prefix: pass the raw Base64 string only. | iVBORw0KGgoAAAANSUhEUg... |
| CurrentImageFormat | Required | Enum | The actual format of the source image in docContent. Must match exactly. Accepted values: BMP · GIF · JPG · PNG · TIFF | PNG |
| NewImageFormat | Required | Enum | The target format for the converted output image. Accepted values: BMP · GIF · JPG · PNG · TIFF | JPG |
Champs de sortie
| Champ | Taper | Description |
|---|---|---|
| Contenu du fichier | Base64 | L'image convertie encodée comme Base64Décodez en binaire et enregistrez avec la nouvelle extension de fichier correcte. |
| Nom de fichier | String | Nom du fichier image de sortie convertie. |
Exemple de requête
En-têtes
Content-Type: application/json
Authorization: YOUR_API_KEY
Charge utile JSON
{
"docName": "company-logo.png",
"docContent": "iVBORw0KGgoAAAANSUhEUg...",
"CurrentImageFormat": "PNG",
"NewImageFormat": "JPG"
}
Réponse
{
"File Content": "BASE64_CONVERTED_IMAGE_DATA",
"File Name": "company-logo.jpg"
}
Exemples de code
Cas d'utilisation courants
Marketing teams often accumulate mixed BMP, TIFF, and GIF files from various sources. Convert them all to PNG in a batch processing loop: PNG gives lossless quality and wide browser support, making it the safest default web format for logos and graphics.
Studio photographs are typically delivered as TIFF (50-200 MB each). Convert to JPG before uploading to your e-commerce platform or CDN to reduce storage costs by 80-90%. Pair with the Compress Image endpoint for a complete optimisation pipeline.
WebP images are 25-35% smaller than equivalent JPGs and supported by all modern browsers. Convert JPG or PNG assets to WebP to improve Core Web Vitals scores. Serve WebP with a JPG fallback using HTML picture elements.
Foire aux questions
▶ What image formats does the Convert Image Format API support?
The API supports BMP, GIF, JPG, PNG, and TIFF as both input (CurrentImageFormat) and output (NewImageFormat). These five formats cover the most common image types used in enterprise and web workflows.
▶ Does CurrentImageFormat need to match the actual binary format of docContent?
Yes: always. The API uses CurrentImageFormat to select the correct decoding codec. A mismatch between the actual binary format and CurrentImageFormat causes a decoding failure. Read the real format from your file's MIME type or binary signature, not just the filename extension.
▶ How does PNG-to-JPG conversion handle transparency?
JPG does not support an alpha channel. Transparent areas in a PNG source are replaced with a solid background colour (typically white) during conversion. If preserving transparency matters: logos, product cut-outs, icons, convert to PNG, GIF, or BMP instead of JPG.
▶ Can I convert and compress an image in the same API call?
No: Convert Image Format only changes the format. To also compress, call Convert Image Format first to get the target format, then pass the result's File Content to the Compress Image endpoint with your chosen compression level. Chain both calls in your application.
▶ What is the maximum file size accepted by this endpoint?
Up to 50 MB. For best performance keep images under 10 MB. Note that format conversion can change file size: converting a PNG to JPG typically reduces size, while converting JPG to TIFF may increase it significantly.