Compress several files and download a ZIP

Choose a batch that makes sense together

Start with the files for one clear task, such as a group of document scans or images for separate form fields. Check the originals and remove accidental duplicate selections before processing. The tool does not decide which version is current or whether a document belongs in your submission.

Select between two and 12 files. Each input must be no larger than 25 MiB, and the combined selected size must be no larger than 50 MiB. Supported compression inputs are PDF, JPG, PNG, WebP and decodable HEIC. An animated GIF, Office document, video or existing ZIP is not part of this batch-compression workflow.

Different formats receive different treatment

For PDFs, the operation attempts lossless repacking of the document structure. It does not lower the resolution of embedded scans or turn pages into images. A PDF that is already efficiently stored may therefore remain the same size. The normal PDF readability, encryption and page-limit checks still apply.

For images, the tool tries re-encoding and can reduce dimensions while looking for a smaller result. The effect depends on the source format and picture content. JPG and WebP may lose visual detail through compression; a resized PNG can also lose detail because it contains fewer pixels even though PNG encoding itself is lossless.

These different methods mean the batch cannot be described accurately with one promised saving. A photograph may become noticeably smaller while a carefully exported PDF barely changes. Review the actual results, particularly where the images contain writing or other details that must remain legible.

Set the transparency choice carefully

The page offers a choice for transparency when converting to JPG: preserve transparency and refuse a conflicting conversion, or flatten onto white or black. Select a solid background only when that is appropriate for the files in the batch.

A transparent graphic prepared for a dark background can look quite different against white. A HEIC conversion may also need an explicit background choice when transparency cannot be ruled out. If the batch contains files needing different treatment, process them in separate groups rather than choosing one background merely to make the whole run proceed.

Understand what unchanged means

A supported file that cannot be made smaller by the available method may be included unchanged. The result reports how many files became smaller individually. Do not read a successful ZIP download as evidence that every member was compressed, or assume that every original byte size has fallen.

If neither individual processing nor the archive reduces the total bytes, the tool can report no useful reduction instead of presenting a misleading saving. That is a reasonable outcome for a set of files already stored efficiently. Re-running the same batch will not necessarily find a new opportunity; consider better source exports or different receiving arrangements.

Download, extract and review the archive

After processing, save the ZIP using the download link. The archive is checked for integrity before being offered, but you should still open it on your device and confirm that the expected files are there. Extract the contents into a clearly named folder before attaching individual files elsewhere.

Check the filenames as well as the count. Names are normalised for downloading, and duplicate names are adjusted to keep archive entries distinct. A changed name does not tell you whether the content is the newer version. Open the actual file and identify it by its contents when two inputs were similarly named.

On Windows, the normal Extract All option can unpack a ZIP into a folder. Other devices have their own file-management controls. Keep the archive until you have confirmed the extracted copies, then use your normal file organisation to avoid mixing them with the originals.

A ZIP is not a replacement for an accepted upload format

If a portal asks for PDF, selecting a ZIP containing PDFs may still be rejected. The same applies to an image field that requires JPG or PNG. Extract the archive and attach the appropriate member to each field unless the site's instructions explicitly allow a ZIP.

Also distinguish the archive size from the size of its contents. An email or portal may apply a limit to each uploaded attachment, the total submission or both. The figure shown for the ZIP does not establish that a particular extracted document fits its own field. Measure the actual member that you intend to submit.

Use target tools for individual hard limits

This batch page aims to reduce files but does not offer a target size for each member. It cannot promise that every result will be under 100KB, 2MB or another receiving cap. Use the appropriate single-file target tool when a strict limit is the central requirement.

For a mixed application, one field might require a small photo while another permits a larger document. Those limits need separate checks. Do not force every attachment down to the smallest limit if it does not apply. Unnecessary image reduction can make evidence harder to read without solving any additional problem.

Keep the source material available

Open the extracted images at a useful viewing size and read the smallest important text. For PDFs, check page counts and document features that matter. A batch saves repetitive clicks, but it does not replace the judgement needed for each document. A technically valid file can still be the wrong attachment or contain unreadable evidence.

Processing takes place in your browser without sending the selected files to Make My Files Work for conversion. The originals remain on your device. The output archive is limited to the tool's safe output budget, and a complex batch can fail on a device with little available memory. Smaller sensible groups are easier to inspect and diagnose than repeatedly retrying the largest possible selection.

Questions that come up