Question 1

How does batch compression work?

Accepted Answer

Batch compression processes multiple images sequentially using the same compression settings. Upload up to 50 images at once, set your desired quality level, and click compress. Each image is processed individually in your browser, and you'll see real-time progress as files are compressed one by one. When complete, all successfully compressed images are packaged into a single ZIP file for easy download.

Question 2

How many images can I compress at once?

Accepted Answer

You can compress up to 50 images in a single batch. This limit ensures stable processing on most devices without overwhelming your browser's memory. If you need to compress more than 50 images, simply process them in multiple batches. All processing happens client-side in your browser, so there are no server restrictions or upload limits.

Question 3

Do all images use the same quality setting?

Accepted Answer

Yes, all images in a batch are compressed using the same quality setting you select. This ensures consistent compression across your entire batch. If you need different quality levels for different images, you can either process them in separate batches with different settings, or use the single image compression tool for individual fine-tuning.

Question 4

How long does batch processing take?

Accepted Answer

Processing time depends on the number of images, their sizes, and your device's capabilities. Small images (under 1MB) process in 1-2 seconds each, while larger images (5-10MB) may take 5-10 seconds each. The tool displays an estimated total time when you select files. A typical batch of 20 medium-sized photos takes about 1-2 minutes to process completely.

Question 5

What happens if one file fails to compress?

Accepted Answer

If a file fails during batch processing, it's automatically skipped and marked with an error indicator. The batch continues processing the remaining files without interruption. Failed files are not included in the final ZIP download. You can see which files succeeded and which failed in the file list, and the summary shows your success rate.

Question 6

How does the ZIP download work?

Accepted Answer

After batch processing completes, all successfully compressed images are packaged into a single ZIP archive. The ZIP file is created entirely in your browser using JavaScript - no server upload required. Click 'Download ZIP' to get all your compressed images at once. The ZIP maintains original filenames with '_compressed' appended, making it easy to identify processed images.

Question 7

Can I mix different file formats in a batch?

Accepted Answer

Yes! You can mix JPG, PNG, WEBP, and GIF files in the same batch. Each file is compressed according to its format's capabilities. Note that if you include non-PNG files, the Lossless (100%) quality option will be disabled, and the maximum quality is capped at 92% for optimal JPG/WEBP compression. For best results, batch similar file types together.

Question 8

Are files processed simultaneously or one at a time?

Accepted Answer

Files are processed sequentially (one at a time) rather than simultaneously. This approach prevents browser crashes from memory overload and ensures stable processing even on less powerful devices. You can watch the progress in real-time as each file is highlighted and marked as complete. Sequential processing is particularly important for large batches to maintain browser stability.

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