The case for browser-side batch conversion
Most online converters cap batch sizes — 5, 10, or 20 files — and rate-limit free users so they upgrade. Browser-side tools sidestep this entirely: the conversion happens on your device using the same hardware that runs your browser, so there's no "server" to limit. Converter.Plus has no per-file cap, no daily quota, and no upload step.
How many files can you convert at once?
In practice, the limiting factor is your device's RAM. A typical modern laptop with 16 GB RAM comfortably handles batches of 200–500 iPhone photos. Older devices or larger source files (raw photos, scans) will manage 50–100 at a time. If you hit a memory ceiling, simply drop your files in two batches.
Step-by-step: batch convert HEIC to JPG
1. Open Converter.Plus's /heic-to-jpg page in any modern browser. 2. Select your HEIC files in your file manager — Cmd-A or Ctrl-A to grab everything in a folder. 3. Drag the selection onto the drop zone. The tool queues every file. 4. Adjust the quality slider once (it applies to the whole batch) and click Convert. 5. When all files finish, click "Download All" — the tool packages every converted JPG into a single ZIP archive ready to extract anywhere.
Tips for big batches
Quality 92 is the sweet spot for photos — visually identical to the source HEIC, much smaller than 100. Close other browser tabs before starting a 500-file batch — they consume RAM that the converter could use. If your laptop has both an integrated and discrete GPU, browser canvas operations usually use the integrated GPU, so battery life isn't dramatically affected.
Beyond HEIC — batch any format
The same workflow works for any format pair Converter.Plus supports: AVIF→JPG, WebP→PNG, PNG→WebP, JPG→AVIF, JXL→JPG, and so on. The image-optimizer tool additionally lets you batch-recompress to WebP or AVIF at a chosen quality, which is the fastest way to slim down an entire folder for the web.
Frequently asked questions
Does browser-side conversion get slower with more files?
It's roughly linear — converting 100 files takes about 100× longer than converting one. For typical iPhone HEIC files at quality 92, expect ~0.3 seconds per file on a modern laptop, so a 200-file batch finishes in about a minute.
What happens if I close the tab mid-batch?
Closing the tab cancels in-flight conversions. Already-completed files remain available for download until you close. There's no server-side resume because there's no server — the work happens entirely on your device.