Question 1

How many images can I compress at once?

Accepted Answer

The number of images you can process in a single batch depends on your device's available memory and processing power. Most modern computers handle batches of 50-100 images without issues. For very large batches of hundreds of images, the tool processes them in chunks to prevent browser memory limitations from affecting the operation.

Question 2

Does batch compression reduce quality more than single-image compression?

Accepted Answer

No. Each image in the batch is compressed independently using the same high-quality algorithms as our single-image compressor. Batch processing simply automates the workflow for multiple files — it does not apply lower quality settings or skip optimization steps. You get the same excellent results for every image in the batch.

Question 3

Can I set different quality levels for different images in the batch?

Accepted Answer

Currently, a single quality setting applies to all images in the batch. However, the auto-optimize mode analyzes each image individually and applies the optimal compression level for that specific image. This approach often produces better results than a fixed quality setting, as different images compress differently depending on their content.

Question 4

What happens to transparency in PNG files during batch compression?

Accepted Answer

PNG files with transparency retain their alpha channel during compression. The tool applies lossless or lossy PNG optimization that preserves the transparency data. If you want to remove transparency and convert to JPEG for smaller file sizes, you should use the image converter tool first and then batch compress the results.

Question 5

Are my images uploaded to a server during batch compression?

Accepted Answer

No. All batch compression happens entirely in your browser using client-side JavaScript. Your images are never uploaded to any server, cloud storage, or third-party service. This ensures the privacy scope described on the site and security for all your files, including sensitive or proprietary images.

Question 6

How much space can I save with batch compression?

Accepted Answer

File size savings vary depending on the original format and content, but typical results range from 40-90% reduction. JPEG and WebP images usually achieve 60-80% savings, while PNG files see 40-70% reduction. The tool displays exact savings for each file so you can quantify the improvement across your entire batch.

Question 7

Can I compress images and convert them to a different format at the same time?

Accepted Answer

The batch compressor focuses on reducing file size while maintaining the original format. If you need to convert formats (such as PNG to WebP) in addition to compression, use the image converter tool first, then batch compress the converted files. This two-step approach gives you maximum control over both format and quality.

Compression par lot d’images

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Image Compressor

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