add new functions for zip and byte slices

.gitignore

@@ -1,3 +1,4 @@
 *.pdf
 assets
 dst
+*.zip

converter/converter.go

@@ -1,6 +1,8 @@
 package converter
 
 import (
+	"archive/zip"
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -18,8 +20,10 @@ import (
 // html to pdf converter structure for
 type Converter struct {
 	chromePath    string
-	ctx        context.Context
+	allocCtx      context.Context
-	cancel     context.CancelFunc
+	allocCancel   context.CancelFunc // Cancels the whole Chrome process manager
+	browserCtx    context.Context    // The specific browser instance
+	browserCancel context.CancelFunc // Closes the browser
 	progress      func(progress int)
 }
 
@@ -27,10 +31,6 @@ type Converter struct {
 func NewConverter(chromePath string) (*Converter, error) {
 	var err error
 
-	if runtime.GOOS == "windows" {
-		hideConsole()
-	}
-
 	c := &Converter{chromePath: chromePath}
 	chromePath, err = c.getChromePath()
 	if err != nil {
@@ -42,14 +42,21 @@ func NewConverter(chromePath string) (*Converter, error) {
 		chromedp.NoSandbox,
 		chromedp.Headless,
 		chromedp.DisableGPU,
-		chromedp.Flag("disable-software-rasterizer", true),
-		chromedp.Flag("disable-dev-shm-usage", true),
-		chromedp.Flag("no-first-run", true),
 	)
 
-	var allocCtx context.Context
+	opts = append(opts, platformOptions())
-	allocCtx, c.cancel = chromedp.NewExecAllocator(context.Background(), opts...)
+
-	c.ctx, c.cancel = chromedp.NewContext(allocCtx)
+	c.allocCtx, c.allocCancel = chromedp.NewExecAllocator(context.Background(), opts...)
+	c.browserCtx, c.browserCancel = chromedp.NewContext(c.allocCtx)
+
+	// 5. "Warm up" the browser to ensure the executable actually runs
+	// This catches "file not found" or permission errors immediately
+	err = chromedp.Run(c.browserCtx)
+	if err != nil {
+		c.Close() // Cleanup if start fails
+		return nil, fmt.Errorf("failed to start chrome: %w", err)
+	}
+
 	return c, nil
 }
 
@@ -58,7 +65,7 @@ func (c *Converter) SetProgressCallback(cb func(progress int)) {
 }
 
 // Convert converts all given input files
-func (c *Converter) Convert(files ...models.File) error {
+func (c *Converter) ConvertToPdf(files ...models.File) error {
 	for i, f := range files {
 		if c.progress != nil {
 			c.progress(i + 1)
@@ -86,10 +93,11 @@ func (c *Converter) Convert(files ...models.File) error {
 
 		htmlURL.WriteString(filepath.ToSlash(absPath))
 
-		c.ctx, c.cancel = context.WithTimeout(c.ctx, 60*time.Second)
+		taskCtx, taskCancel := chromedp.NewContext(c.browserCtx)
+		timeoutCtx, timeoutCancel := context.WithTimeout(taskCtx, 60*time.Second)
 
 		var pdfData []byte
-		err = chromedp.Run(c.ctx,
+		err = chromedp.Run(timeoutCtx,
 			chromedp.Navigate(htmlURL.String()),
 			chromedp.WaitReady("body", chromedp.ByQuery),
 			chromedp.ActionFunc(func(ctx context.Context) error {
@@ -106,21 +114,207 @@ func (c *Converter) Convert(files ...models.File) error {
 			}),
 		)
 
+		timeoutCancel()
+		taskCancel()
 		if err != nil {
-			c.cancel()
 			return err
 		}
 
 		// Save PDF to file
 		if err := os.WriteFile(f.Output, pdfData, 0644); err != nil {
-			c.cancel()
 			return err
 		}
 	}
-	c.cancel()
 	return nil
 }
 
+// Convert converts all given input files
+func (c *Converter) ConvertHtmlsToPdf(htmls ...models.Html) error {
+	for i, h := range htmls {
+		if c.progress != nil {
+			c.progress(i + 1)
+		}
+		if len(h.Html) == 0 {
+			return fmt.Errorf("no .html input provided")
+		} else if h.Output == "" || filepath.Ext(h.Output) != ".pdf" {
+			return fmt.Errorf("no .pdf output file path provided: %s", h.Output)
+		}
+
+		taskCtx, taskCancel := chromedp.NewContext(c.browserCtx)
+		timeoutCtx, timeoutCancel := context.WithTimeout(taskCtx, 60*time.Second)
+
+		var pdfData []byte
+		err := chromedp.Run(timeoutCtx,
+			// Start with a blank page
+			chromedp.Navigate("about:blank"),
+			// Inject HTML directly
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				frameTree, err := page.GetFrameTree().Do(ctx)
+				if err != nil {
+					return err
+				}
+
+				return page.SetDocumentContent(frameTree.Frame.ID, string(h.Html)).Do(ctx)
+			}),
+			chromedp.WaitReady("body", chromedp.ByQuery),
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				buf, _, err := page.PrintToPDF().
+					WithPrintBackground(true).
+					WithPaperWidth(8.27).
+					WithPaperHeight(11.69).
+					Do(ctx)
+				if err != nil {
+					return err
+				}
+				pdfData = buf
+				return nil
+			}),
+		)
+
+		timeoutCancel()
+		taskCancel()
+		if err != nil {
+			return err
+		}
+
+		// Save PDF to file
+		if err := os.WriteFile(h.Output, pdfData, 0644); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Convert converts all given input files
+func (c *Converter) ConvertHtmlsToBytes(htmls ...models.Html) ([][]byte, error) {
+	var output [][]byte
+	for i, h := range htmls {
+		if c.progress != nil {
+			c.progress(i + 1)
+		}
+		if len(h.Html) == 0 {
+			return nil, fmt.Errorf("no .html input provided")
+		} else if h.Output == "" || filepath.Ext(h.Output) != ".pdf" {
+			return nil, fmt.Errorf("no .pdf output file path provided: %s", h.Output)
+		}
+
+		taskCtx, taskCancel := chromedp.NewContext(c.browserCtx)
+		timeoutCtx, timeoutCancel := context.WithTimeout(taskCtx, 60*time.Second)
+
+		var pdfData []byte
+		err := chromedp.Run(timeoutCtx,
+			// Start with a blank page
+			chromedp.Navigate("about:blank"),
+			// Inject HTML directly
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				frameTree, err := page.GetFrameTree().Do(ctx)
+				if err != nil {
+					return err
+				}
+
+				return page.SetDocumentContent(frameTree.Frame.ID, string(h.Html)).Do(ctx)
+			}),
+			chromedp.WaitReady("body", chromedp.ByQuery),
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				buf, _, err := page.PrintToPDF().
+					WithPrintBackground(true).
+					WithPaperWidth(8.27).
+					WithPaperHeight(11.69).
+					Do(ctx)
+				if err != nil {
+					return err
+				}
+				pdfData = buf
+				return nil
+			}),
+		)
+
+		timeoutCancel()
+		taskCancel()
+		if err != nil {
+			return nil, err
+		}
+
+		// add to array of bytes
+		output = append(output, pdfData)
+	}
+	return output, nil
+}
+
+// Convert html to pdf and return zip as bytes
+func (c *Converter) ConvertHtmlsToZip(htmls ...models.Html) ([]byte, error) {
+	zipBuf := new(bytes.Buffer)
+	zipWriter := zip.NewWriter(zipBuf)
+
+	for i, h := range htmls {
+		if c.progress != nil {
+			c.progress(i + 1)
+		}
+		if len(h.Html) == 0 {
+			return nil, fmt.Errorf("no .html input provided")
+		} else if h.Output == "" || filepath.Ext(h.Output) != ".pdf" {
+			return nil, fmt.Errorf("no .pdf output file path provided: %s", h.Output)
+		}
+
+		taskCtx, taskCancel := chromedp.NewContext(c.browserCtx)
+		timeoutCtx, timeoutCancel := context.WithTimeout(taskCtx, 60*time.Second)
+
+		var pdfData []byte
+		err := chromedp.Run(timeoutCtx,
+			// Start with a blank page
+			chromedp.Navigate("about:blank"),
+			// Inject HTML directly
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				frameTree, err := page.GetFrameTree().Do(ctx)
+				if err != nil {
+					return err
+				}
+
+				return page.SetDocumentContent(frameTree.Frame.ID, string(h.Html)).Do(ctx)
+			}),
+			chromedp.WaitReady("body", chromedp.ByQuery),
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				buf, _, err := page.PrintToPDF().
+					WithPrintBackground(true).
+					WithPaperWidth(8.27).
+					WithPaperHeight(11.69).
+					Do(ctx)
+				if err != nil {
+					return err
+				}
+				pdfData = buf
+				return nil
+			}),
+		)
+
+		timeoutCancel()
+		taskCancel()
+		if err != nil {
+			return nil, err
+		}
+
+		// add to zip
+		f, err := zipWriter.Create(h.Output)
+		if err != nil {
+			return nil, err
+		}
+		f.Write(pdfData)
+	}
+	zipWriter.Close()
+
+	return zipBuf.Bytes(), nil
+}
+
+func (c *Converter) Close() {
+	// Close browser first, then allocator
+	if c.browserCancel != nil {
+		c.browserCancel()
+	}
+	if c.allocCancel != nil {
+		c.allocCancel()
+	}
+}
+
 // getChromePath checks for system Chrome, else falls back to bundled headless shell
 func (c *Converter) getChromePath() (string, error) {
 

converter/hideOthers.go

@@ -2,8 +2,9 @@
 
 package converter
 
-// hideConsole does nothing on non-Windows systems
+import "github.com/chromedp/chromedp"
-func hideConsole() {
+
-	// macOS and Linux don't have the same "console window" concept
+func platformOptions() chromedp.ExecAllocatorOption {
-	// that needs manual hiding at runtime like Windows.
+	// Returns a no-op option for Mac/Linux
+	return chromedp.NoSandbox
 }

converter/hideWindows.go

@@ -3,21 +3,18 @@
 package converter
 
 import (
+	"os/exec"
 	"syscall"
+
+	"github.com/chromedp/chromedp"
 )
 
-var (
+func platformOptions() chromedp.ExecAllocatorOption {
-	kernel32         = syscall.NewLazyDLL("kernel32.dll")
+	return chromedp.ModifyCmdFunc(func(cmd *exec.Cmd) {
-	user32           = syscall.NewLazyDLL("user32.dll")
+		if cmd.SysProcAttr == nil {
-	getConsoleWindow = kernel32.NewProc("GetConsoleWindow")
+			cmd.SysProcAttr = &syscall.SysProcAttr{}
-	showWindow       = user32.NewProc("ShowWindow")
-)
-
-const SW_HIDE = 0
-
-func hideConsole() {
-	hwnd, _, _ := getConsoleWindow.Call()
-	if hwnd != 0 {
-		showWindow.Call(hwnd, SW_HIDE)
 		}
+		cmd.SysProcAttr.HideWindow = true
+		cmd.SysProcAttr.CreationFlags = 0x08000000 // CREATE_NO_WINDOW
+	})
 }

html2pdf.go

@@ -15,7 +15,9 @@ func Convert(chromePath, inputFile, outputFile string) error {
 	if err != nil {
 		return err
 	}
-	return c.Convert(input)
+	defer c.Close()
+
+	return c.ConvertToPdf(input)
 }
 
 // NewConverterInstance start new chrome headless shell instance

html2pdf_test.go

@@ -1,6 +1,7 @@
 package html2pdf
 
 import (
+	"bytes"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -42,17 +43,145 @@ func TestConvertFiles(t *testing.T) {
 		})
 	}
 
-	c, err := converter.NewConverter("./assets")
+	c, err := converter.NewConverter("assets/chrome-headless-shell/win64")
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer c.Close()
 
 	c.SetProgressCallback(func(progress int) {
 		fmt.Println(progress)
 	})
 
-	if err := c.Convert(input...); err != nil {
+	if err := c.ConvertToPdf(input...); err != nil {
 		t.Fatal(err)
 	}
 	t.Log("test successfull")
 }
+
+func TestConvertHtml(t *testing.T) {
+	t.Log("start test ConvertHtml")
+
+	// Skip in short mode (useful for CI)
+	if testing.Short() {
+		t.Skip("skipping ConvertHtml integration test in short mode")
+	}
+
+	html := []byte(`
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<title>Test PDF</title>
+	<style>
+		body { font-family: Arial, sans-serif; }
+		h1 { color: #333; }
+	</style>
+</head>
+<body>
+	<h1>Hello PDF</h1>
+	<p>This is a test.</p>
+</body>
+</html>
+`)
+
+	tmpDir := t.TempDir()
+	outputPath := filepath.Join(tmpDir, "test.pdf")
+
+	c, err := converter.NewConverter("assets/chrome-headless-shell/win64")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+
+	err = c.ConvertHtmlsToPdf(models.Html{Html: html, Output: outputPath})
+	if err != nil {
+		t.Fatalf("ConvertHtml failed: %v", err)
+	}
+
+	// Assert PDF exists
+	data, err := os.ReadFile(outputPath)
+	if err != nil {
+		t.Fatalf("PDF not created: %v", err)
+	}
+
+	// Assert non-empty
+	if len(data) == 0 {
+		t.Fatal("PDF file is empty")
+	}
+
+	// Assert valid PDF header
+	if !bytes.HasPrefix(data, []byte("%PDF-")) {
+		t.Fatalf("output is not a valid PDF (missing %%PDF- header)")
+	}
+
+	t.Log("ConvertHtml test successful")
+}
+
+func TestConvertHtmlsToPDFZip(t *testing.T) {
+	t.Log("start test ConvertHtml")
+
+	// Skip in short mode (useful for CI)
+	if testing.Short() {
+		t.Skip("skipping ConvertHtml integration test in short mode")
+	}
+
+	html := []byte(`
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<title>Test PDF</title>
+	<style>
+		body { font-family: Arial, sans-serif; }
+		h1 { color: #333; }
+	</style>
+</head>
+<body>
+	<h1>Hello PDF</h1>
+	<p>This is a test.</p>
+</body>
+</html>
+`)
+
+	outputPath := filepath.Join("test.pdf")
+
+	c, err := converter.NewConverter("assets/chrome-headless-shell/win64")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+
+	b, err := c.ConvertHtmlsToZip(models.Html{Html: html, Output: outputPath})
+	if err != nil {
+		t.Fatalf("ConvertHtml failed: %v", err)
+	}
+
+	f, err := os.Create("test.zip")
+	if err != nil {
+		t.Fatalf("create file: %v", err)
+	}
+	defer f.Close()
+	_, err = f.Write(b)
+	if err != nil {
+		t.Fatalf("write to file: %v", err)
+	}
+
+	// // Assert PDF exists
+	// data, err := os.ReadFile(outputPath)
+	// if err != nil {
+	// 	t.Fatalf("PDF not created: %v", err)
+	// }
+
+	// // Assert non-empty
+	// if len(data) == 0 {
+	// 	t.Fatal("PDF file is empty")
+	// }
+
+	// // Assert valid PDF header
+	// if !bytes.HasPrefix(data, []byte("%PDF-")) {
+	// 	t.Fatalf("output is not a valid PDF (missing %%PDF- header)")
+	// }
+
+	t.Log("ConvertHtml test successful")
+}

models/html.go

@@ -0,0 +1,9 @@
+package models
+
+type Htmls []Html
+
+// input model for converter
+type Html struct {
+	Html   []byte
+	Output string
+}