resize all/multiple images at once from folder / subfolder by c# in any size

for image processing first step is get a proper sized image. and maximum time need many images resizing at once. it easy but take lot of time. so i made a programme to do that in a second, which u can get here with full source code.

steps are

  • select folder.
  • make a list of all images file from that folder including subfolder as user wish.
  • resize all of them
  • save the images

so for select folder we use Folderbowserdialog ,

private void button4_Click(object sender, EventArgs e)
FolderBrowserDialog f = new FolderBrowserDialog();
if (f.ShowDialog() == DialogResult.OK) // selecting directory
textBox2.Text = f.SelectedPath;
DirectoryInfo Folder;

Folder = new DirectoryInfo(f.SelectedPath);//take all directoryinfo
if (checkBox1.Checked)
Images = Folder.GetFiles(".", SearchOption.AllDirectories);//for subfolders
Images = Folder.GetFiles(".", SearchOption.TopDirectoryOnly);// for only current folder

int j = 0;
for (int i = 0; i < Images.Length; i++)
if (Images[i].FullName.Contains(".jpg") || Images[i].FullName.Contains(".bmp") || Images[i].FullName.Contains(".jpeg"))//check are they images or not

Bitmap bmp = new Bitmap(Images[i].FullName);//get image
PictureBox p = new PictureBox();

p.Image = bmp;
p.Height = bmp.Height;
p.Width = bmp.Width;
flowLayoutPanel1.Controls.Add(p); //show in picturebox uing flowpanel


catch (Exception a) { MessageBox.Show("unauthorized access"); }//exception from protected directory


so we get all the imagefile in our fileinfo clss images now for resize and save we have to write

 for (int i = 0; i < Images.Length; i++)//take all image file

                    if (Images[i].FullName.Contains(".jpg") || Images[i].FullName.Contains(".bmp") || Images[i].FullName.Contains(".jpeg"))
                        Bitmap bmp = new Bitmap(Images[i].FullName);
                        int resizedW = Convert.ToInt16(numericUpDown3.Value);
                        int resizedH = Convert.ToInt16(numericUpDown4.Value);

                        bmpResized = new Bitmap(bmp, resizedW, resizedH); //resizing image
                        if (filepath != null)//saving image
                            bmpResized.Save(filepath + "\\" + Images[i].Name);
                        { bmpResized.Save(Images[i].DirectoryName + "\\" + i.ToString() + Images[i].Name); }

it is very simple and beginning level c# code hope it would be helpful


About kishor datta gupta

Graduate Research Assistant at University of Memphis Software Engineer at Silicon Orchard LTD. Former Research Assistant at Lamar University Former Software Engineer at Samsung R&D Institute Bangladesh Studies Ph.D. Computer Science at University of Memphis Studied Masters of Science in Computer Sciences at Lamar University Studied BSC in CSE at Khulna University of Engineering and Technology Studied HSC (completed) at Chittagang college 04-06 Studied High school at ST. Placid's High School'04 Studied Junior Secondary School at Saint Mary's School Lives in Memphis, Tennessee
This entry was posted in C#, Image Processing, Winform app and tagged , , , , , , , , . Bookmark the permalink.

4 Responses to resize all/multiple images at once from folder / subfolder by c# in any size

  1. fadedreamz says:

    nice article …. keep it up kishordgupta

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