Image Tools / Local studio

Batch Image Format Converter

Convert a group of authorised images to one selected output format locally and download the resulting copies as a ZIP archive.

Runs locallyNo image upload to Nirmion

Step 1 / Source

Choose one image

JPEG · PNG · WebP · 20 MB

Drop your images here

Or browse for two to 20 authorised JPEG, PNG, or WebP images in output order.

Browse imageUp to 20 files · 20 MB each · browser processed

Step 2 / Output

Batch format controls

One output format and quality profile is applied to every selected image locally.

Export quality 82%Higher quality keeps more detail and usually creates a larger file. PNG export ignores this setting.Output format

Create a converted image ZIPThe original files stay unchanged and each converted copy is placed in the archive.

Keep this page open until the download begins.

01No server upload

The selected image is decoded and re-encoded inside this browser tab.

02Working copy released

After download, the preview URL, decoded bitmap, canvas, and selected source reference are cleared.

03Your download remains

Nirmion cannot remove the finished file from your device or browser download history.

Workflow guide

A deliberate batch conversion workflow

Convert a consistent set of authorised images without sending them to a server.

What you need

Choose two to twenty JPEG, PNG, or WebP files up to 20 MB each.

Social-ready choices

Check transparency, text, gradients, filenames, and destination compatibility before delivery.

What you receive

Receive one ZIP containing independently converted image copies.

Decision guide

Convert a set consistently without changing the originals

Batch Image Format Converter applies one chosen format profile to a selected set and packages independent results.

Browser processing keeps source files on the device during this session, but it does not remove copies in backups, shared drives, publishing platforms, or downstream systems. Review the full handling path before treating the converted archive as a privacy control.

Useful batch conversion scenarios

Prepare a campaign set for one publishing destination.
Create review copies before a design handoff.
Deliver consistently formatted derivatives in one archive.

Good to know

Important image boundaries

Why might a PNG not become smaller?: PNG is lossless and browsers do not expose a quality control for it. Choose WebP or JPEG when reducing file size matters more than exact lossless pixels.
Are animated images supported?: No. The workspace accepts still JPEG, PNG, and WebP files. Re-encoding an animated source would otherwise keep only one frame.
What does clearing the file mean?: Because processing is local, there is no Nirmion server copy to delete. The tab releases its working references after success; your downloaded output remains on your device.