How to Convert Images in Bulk (Hundreds at Once, Free)

One at a Time Does Not Scale

Converting a single image is trivial. Converting the 240 photos from a shoot, or every PNG in a website folder, is a different job — and most free tools quietly assume you only have one file. You end up uploading, waiting, downloading, and repeating until the afternoon is gone.

Batch processing turns that into one action: add everything, press convert once, download a single ZIP.

How to Convert a Batch of Images

Step 1: Open Convert Image.

Step 2: Drag in every image at once. You can select a whole folder's worth in the file picker, or drop them together. Add more at any point before you start.

Step 3: Pick your output format — JPG, PNG, WebP, GIF or AVIF.

Step 4: Press convert. Each file gets its own row showing whether it is queued, converting, done or failed, with the original and final size side by side.

Step 5: Download. Grab any single file from its row, or take everything at once with Download all as ZIP.

Why the Queue Matters

A batch is not all-or-nothing. If one file is corrupt or in an odd format, it fails on its own row and everything else still finishes — and you can retry just that file rather than starting the whole batch again. Filenames are preserved, so a folder of images comes out the other side with the same names and a new extension, ready to drop straight back into place.

Which Tools Handle Batches

The same pattern works across the site:

Convert Image — change format for a whole folder
Compress Image — shrink many photos at one quality setting
Resize Image — apply the same dimensions to every file
Image to WebP — convert a site's images in one pass
Compress PDF and Split PDF — the same idea for documents
Word to PDF and Excel to PDF — convert a stack of documents

Real Batch Jobs Worth Doing

Converting a website's images to WebP. WebP files are typically 25–35% smaller than equivalent JPGs at the same visible quality. Doing this to an entire image folder in one pass is one of the cheapest page-speed wins available.

Preparing a product catalogue. Resize every product photo to identical dimensions so your grid does not jump around, then compress the lot.

Getting a photo dump under an upload limit. Compress every image at one quality setting, check the sizes in the queue, and adjust if any are still over.

Standardising a mixed folder. Old archives are usually a mess of BMP, TIFF, PNG and JPG. Convert them all to one modern format in a single run.

Practical Advice for Large Batches

Convert first, compress second. Format conversion then compression gives you more control than trying to do both at once.
Watch the size column. Each finished row shows original size against final size, so you can see immediately whether your quality setting is doing what you expected — before you download 240 files.
Very large batches take time. Files are processed a few at a time on purpose, so the tool stays responsive and does not overwhelm the server. Leave the tab open.
Files are never stored. Image conversion, compression and resizing are processed and returned immediately — nothing is kept on our servers.

Free, No Account, No Cap

There is no file-count limit, no queue for free users, no watermark and no sign-up.

Convert a batch of images now →