To add operations to be performed with your files during conversion, go to the Settings → Edit operations tab in DocuFreezer. Here you can specify some operations to be performed in addition to file conversion.
On this page
Watermarking
Text watermark
The Text watermark operation enables you to create your own text watermark to add to pages or images during file conversion. By default, it adds the source page number (with the {srcfilepageno} macro) to the bottom right corner. You can adjust text style and use various built-in macros to add page numbers, file date and time, original document name, and other document-related data.
Learn more about Text watermark →
Image watermark
To add a watermark from an image or image-like file (such as JPG, PNG, HTML, PDF), choose a file and customize its size and position (for example, behind the document's contents and in the top right corner). You can modify watermark size, opacity, rotation, and more.
Learn more about Image watermark →
Barcode watermark
You can add a watermark containing a barcode, like QR Code or other types such as EAN, UPC, CODE 128, and Data Matrix. You can choose the type of barcode and adjust its position, size, rotation, and other settings, just like with other watermarks.
Learn more about Barcode watermark →
PDF text annotation
You can apply text annotations to output PDFs using this operation. It allows you to add any text and choose typeface, font style, and other parameters. This operation is similar to Text watermark and has the same parameters, but it generally works faster since it doesn't involve re-rendering pages because the text is added on top of the document contents.
Text removal
PDF Remove text
The PDF Remove text operation lets you find and remove text from PDF documents during conversion. Enter the text in Search for text to remove and choose a matching mode: Contains, Starts with, or Using wildcards. Enable Case sensitive to distinguish between uppercase and lowercase letters.
You can apply the operation to all pages or limit it to specific pages using Apply to a page range.
Rotation and Auto-Rotation
Rotate
The Rotate operation allows you to rotate input files clockwise or counterclockwise to a certain degree.
Note: Arbitrary angles are only possible for raster images. Please use straight angles for other types of documents, such as PDFs.
Auto rotate
You can enable automatic rotation of images or document pages. The operation's parameters allow you to keep the original document orientation (As in document) or force the output files' orientation to Portrait (vertical) or Landscape (horizontal).
What's the difference between Rotate and Auto rotate?
Resizing
Resize
The Resize operation lets you change the size of output images or document pages. You can specify a new size in pixels, millimeters, centimeters, inches, or percent. Various fitting modes are available: Fit…, Fill…, Thumbnail, or Stretch.
Cropping
Auto crop
The Auto Crop operation automatically removes blank (white) margins from pages or images. A high Tolerance value allows you to define white less strictly. Experiment with this option to get the most appropriate result.
In addition, you can use the Apply to a page range option to apply the operation to specific pages or page ranges only.
Crop margins
The Crop margins operation performs image/page cropping based on margins that can be customized. You need to specify the indents (Left, Right, Top, Bottom) so that the program can crop your files.
Additionally, you can set Page range — to apply this operation to selected pages or page ranges. Enter page numbers and/or ranges separated by commas next to Apply to a page range. For example: 1,3,5-10
Crop rectangle
The Crop rectangle operation crops the image/page by the border of a rectangle whose dimensions can be customized. You can set the width (Width), height (Height) of the rectangle and the indents from the left side (Left) and top (Top) of the page or image.
You can also set the Page range to apply this operation to selected pages or page ranges. Enter page numbers and/or ranges separated by commas next to Apply to a page range. For example: 1,3,5-10
Color management
Grayscale
The new Grayscale operation lets you transform documents and images into monochrome formats during conversion. This feature is especially useful for reducing file size, improving readability, or preparing documents for printing.
You can choose between two modes:
- 256 shades of gray – preserves fine details and smooth gradients while removing color.
- Black and white – creates high-contrast output with optional dithering, which helps preserve visual clarity in images by simulating shades of gray using patterns of black and white dots.
Grayscale conversion for PDF files
If you are not satisfied with the results from the default PDF editing engine, go to Settings → Advanced → Application → Task processor → PDF file editing engine and select AsposePDF.
This newer engine can produce cleaner images with better detail when converting PDFs to grayscale. It also preserves existing searchable text, so you can still search, select, and copy it in the output PDF. The default engine PatagamesPdfium rasterizes the pages, making the text part of an image instead.
Rasterize
The Rasterize operation converts document pages into raster images during conversion. When saving to PDF, it turns text and graphics into image content, making them harder to edit individually. For example, you can use it when sharing a PDF form containing text and a graphic signature.
You can set the Rasterization resolution in DPI, adjust Jpeg quality, and enable Antialiasing to smooth text and graphic edges. Lower resolution reduces detail but may also affect readability. Apply the operation to all pages or a specific page range.
Note: Rasterization does not prevent document editing or signature extraction. Text can still be recovered using OCR, and a signature can be copied from the page image.
Post convert operations
Post convert operations let you add watermarks to the resulting files after conversion is complete. To set them up, go to Settings → Post convert operations, click Add new, and choose an operation:
- Text watermark — add text, such as page numbers or document-related information.
- Image watermark — add an image, such as a logo.
- Barcode watermark — add a QR code or another supported barcode.
These operations work like their counterparts on the Edit operations tab, but run after conversion. For example, when merging multiple files into one PDF, you can use a text watermark to apply continuous page numbering throughout the resulting document.
