Apex Reference Guide
jBlob Class
Namespace
Usage
Salesforce supports Blob manipulation only with Apex class methods that are supplied by Salesforce. For more information on Blobs, see Primitive Data Types.
Blob Methods
The following are methods for Blob.
size()
Signature
public Integer size()
Return Value
Type: Integer
Example
1String myString = 'StringToBlob';
2Blob myBlob = Blob.valueof(myString);
3Integer size = myBlob.size();toPdf(stringToConvert)
Signature
public static Blob toPdf(String stringToConvert)
Parameters
- stringToConvert
- Type: String
Return Value
Type: Blob
Usage
Blob.toPDF(stringToConvert) works with any string value. Since the Spring ’26 release, Blob.toPDF() can use the same PDF rendering service as Visualforce. This change is currently controlled by a Release Update. See Use Visualforce PDF Rendering Service with Apex Blob.toPdf() (Release Update) in the Salesforce release notes.
See Render a Visualforce Page as a PDF File for details of the improved PDF rendering service, including considerations and limitations for rendering PDF files.
The Visualforce PDF rendering service expands the range of fonts available, and includes a multibyte-capable font. The default font is serif, which is a change from the default sans-serif used by Blob.toPDF(). See Fonts Available When Using Visualforce PDF Rendering.
Example
1String pdfContent = 'This is a test string';
2Account a = new account(name = 'test');
3insert a;
4Attachment attachmentPDF = new Attachment();
5attachmentPdf.parentId = a.id;
6attachmentPdf.name = a.name + '.pdf';
7attachmentPdf.body = Blob.toPDF(pdfContent);
8insert attachmentPDF;toString()
Signature
public String toString()
Return Value
Type: String
Example
1String myString = 'StringToBlob';
2Blob myBlob = Blob.valueof(myString);
3System.assertEquals('StringToBlob', myBlob.toString());