Batch Image Compression Without Uploads

Choose batch compression for a shared task

Batch image compression is useful when several photos need similar delivery settings. Corvexs Digital’s batch workspace processes selected images locally and sequentially. You can select up to 20 files, with a 20 MB input limit per file. It is a manual browser workflow, not an API, watched folder or automatic website integration.

Keep originals in a separate folder and make exports into a delivery folder. Decide whether the batch is for thumbnails, product photos or general sharing. Do not combine unrelated jobs simply because all the files are pictures. A readable screenshot and a photographic thumbnail often need different choices.

Test the difficult image first

Pick an original with the smallest lettering, finest texture or most important transparent edge in its group. Set the output width and quality, then inspect a sample at the intended display size. If that image fails, change the settings before processing its companions. This reduces avoidable repeated work without promising that every image will behave identically.

For product pictures, check a close-up as well as the overall composition. For screenshots, prioritize legibility over tiny byte counts. Avoid enlarging a small source to imitate a larger master: the tools do not upscale, and compression cannot recreate missing detail.

Understand what the batch controls can do

The batch controls set quality and width. They do not apply an exact KB target to every file. When a form requires each image under 100 KB or 200 KB, use the individual target-size workflow and confirm each output instead. Twenty images exported with one quality setting can have twenty different sizes.

PNG does not respond to the canvas quality control in the same way as lossy JPG or WebP. Reducing pixel dimensions can still change its size. Format handling also matters: check the actual output for each input type. An animated input becomes a still image, vector input becomes pixels, and the batch PDF workflow uses the first page. Use a separate workflow when those changes would lose required content.

Keep browser memory manageable

A small encoded file can decode into millions of pixels. Sequential processing helps avoid starting all encoders together, but originals, previews and completed results still consume resources. A supported file size is not a guarantee that every phone can handle a full batch.

If the page reloads or processing stalls, try a smaller group and lower-dimension originals. Close other demanding applications and keep the tool visible. Lowering output quality alone does not avoid decoding the original. Do not interpret a stalled browser as proof that the selected files were uploaded.

Review the exports before distributing them

Check that every expected file has a result. Open a photograph, a detailed image and a transparent image where applicable; investigate individual errors rather than assuming a downloaded collection is complete. Compare actual output bytes with originals. Already efficient files can remain similar in size or grow.

A ZIP download packages the results conveniently; it does not promise substantial additional compression of JPG or WebP data. Extract the files, check their names, types and dimensions, and try them in the destination. Keep the masters until the delivered collection has been accepted. Selected media stays local during this processing, while normal page requests and separately permitted tracking remain distinct website activity.

Questions & answers

Your next step

Select batch mode in the image studio and test a small group of similar originals. Inspect the extracted exports before sharing.