HEIC to JPG converter bulk, a whole folder at once

Most bulk converters cap what you can do at once — ten files, twenty a day, or a queue that wants an account first. That limit exists because someone is paying a server to process every file. Nothing here runs on a server: your own browser decodes each photo, so there is no per-file cost to ration and no queue to join.

What that means in practice: select a handful of HEICs and they are done before you have finished reading this sentence; select several hundred — a full camera roll dumped off a phone — and your browser will work through them steadily, with each one appearing in the list as it finishes. Doing that in batches of roughly fifty keeps the browser responsive and lets you start saving before the whole set is through.

JPG is the one format every device, program and upload form already understands — a printer at a shop, a decade-old photo viewer, a form that only lists JPG or PNG, a phone that is not an iPhone. HEIC is smaller and keeps more of what the camera captured, but a photo nobody else's software can open is not useful once it leaves your own device, and that is the entire reason to convert a batch rather than leave it alone.

The trade runs the opposite way from what people expect: HEIC's HEVC-based compression is more efficient than JPG's older algorithm at the same visual quality, so converting the whole set to JPG usually lands the files somewhere between the same size as the HEICs and roughly twice as large. You are not losing anything you will see — you are spending some storage to buy compatibility with everything that is not Apple's own software.

There is no ZIP file at the end of this, and that is deliberate rather than a missing feature. Each photo gets its own download link as it finishes, and once two or more are ready a Save all button appears; pressing it fires the downloads off one after another rather than bundling them into an archive. Your browser will ask, the first time, whether this page may save multiple files — allow it, and the rest follow straight into your Downloads folder, each one keeping its original name with .jpg on the end instead of .heic.

Building an actual ZIP would mean holding every converted photo in memory a second time just to package it, for a step most people immediately undo anyway by dragging the files back out. Skipping it is what keeps a batch of a few hundred photos from asking your browser to hold twice as much at once.

Nothing leaves your device. The conversion runs inside this page using your browser's own image engine, so your photos are never uploaded to us or to anyone else — there is no server here to upload them to. That also means it keeps working on a bad connection, and it costs nothing per file.

• Keep the originals until you have checked the results. The HEICs are untouched — this only writes new files — but check a few before you clear the phone.
• Sort out what you actually want first. Converting 400 photos when you need 40 is a lot of your own machine's time for nothing.
• Plug the laptop in. Decoding hundreds of images is real work for the processor.
• Doing this to email them? JPGs off a modern phone are still several megabytes each; compressing them afterwards will do more for the attachment size than the format change did.

Turning the whole set into one document instead? ScanReviver takes up to ten photos and makes a single multi-page PDF.