One batch of images.
Ready to share.

How to prepare a batch of images

1. Add your originals. Choose JPG, PNG, or still WebP files. The sample batch contains original synthetic artwork, so you can explore without adding personal images.
2. Set a shared recipe. Pick a ratio, crop or borders, output width, format, target size, and optional watermark. The recipe applies to every image using shared settings.
3. Process and inspect. Select each result to compare it with the original. If a crop cuts off a product or a caption, select the one-off recipe for that image and move its focus or change its fit.
4. Process again after edits. Then download the ZIP of successful outputs and its export report. Keep your original files for future edits.

Crop to fill, or keep the whole image with borders?

Crop to fill removes edges until the picture fills the chosen ratio. It is useful for a consistent set of thumbnails. The focus controls decide which part of the original survives the crop.

Add borders keeps the whole picture inside the frame. Use it when labels, artwork edges, or a wide product arrangement must stay visible. Empty space uses your selected background color. That opaque background also sits behind any transparent areas.

The ratios—such as 1:1, 4:5, and 16:9—are general geometric choices. They are not official requirements for any publishing platform. Check the destination's current instructions when preparing a particular placement.

Output width controls pixels, not sharpness

The width field sets the output's horizontal pixel count. Height follows the selected ratio: a 1,200 px wide image at 4:5 is 1,500 px tall. A width of 0 keeps the size of the framed image; adding borders can increase the canvas without enlarging the picture inside it.

Enlargement is off by default. A small original may therefore export below your requested width. Turning enlargement on creates more pixels, but cannot recover detail that was never captured. Each processed result shows its actual dimensions.

JPG, PNG, or WebP for your batch?

• JPG is a practical choice for opaque photographs. It cannot preserve transparency. If an original contains transparent pixels, confirm the chosen background color before exporting it as JPG.
• PNG keeps lossless pixel data and can preserve transparency when using crop. It is useful for clean graphics and sharp text, but detailed photographs may produce large files.
• WebP supports transparency and lossy quality adjustment. Use it when your destination accepts WebP; confirm that before preparing a large batch.

Postbatch uses the browser's image encoder. Exact color and compression results can differ across browsers. It checks the returned format and reports an unsupported export instead of silently labeling a different format. See the MDN canvas export documentation for the browser behavior behind this step.

Compress toward a target KB without changing dimensions

For JPG and WebP, the target search lowers quality from your selected maximum while preserving output dimensions. A target is a ceiling to aim for, not a promise of an exact file size. Postbatch uses 1 KB = 1,024 bytes. Set the target to 0 to switch the search off.

A busy photograph may still exceed a small target at minimum quality. The result will say the target was not reached and show the real byte count. Increase the target or deliberately choose a smaller width, then process again.

PNG is lossless, so its quality control does not reduce size. If a PNG misses the target, reduce its dimensions or choose JPG or WebP when those formats suit the image. Cropping, resizing, and conversion can also make an export larger than its original.

Add text or a logo you are allowed to use

Choose a corner or the center, then adjust size and opacity. For text, size sets the font height as a percentage of the shorter image side; long text is reduced to fit. For a logo, size sets its width as a percentage of output width, with its proportions preserved. Watermarks sit inside a small margin.

A transparent PNG logo usually avoids an unwanted rectangular background. Only use images, text, and logos you own or have permission to use. A watermark does not establish ownership or prevent copying. Inspect it against both light and dark parts of every image.

Check the finished files before posting

Review the processed preview, actual width and height, file size, target status, and warnings. Successful images can be downloaded together in a ZIP with an export report. Original files are never overwritten.

Images are decoded with their EXIF orientation before drawing; this keeps a supported rotated camera image the right way up. The browser option is described in MDN's image bitmap documentation. Exports are newly encoded from pixels, so original EXIF location metadata is not copied.

Metadata removal does not anonymize a picture. Faces, addresses, locations visible in the scene, watermarks, and filenames may still identify someone. Read the privacy boundaries and review the report before sharing your ZIP.