How many images can I batch convert at once?

There is no hard limit — it depends on your device's memory. Most laptops handle 100-300 images easily. For very large batches (500+), process in groups of 200 to avoid browser memory issues.

Does batch conversion reduce image quality?

Converting between lossy formats (JPG→JPG) or from lossless to lossy (PNG→JPG) introduces minimal quality loss at default settings. Converting from lossy to lossless (JPG→PNG) does not improve quality — it just makes the file larger. For highest quality, convert from your original source files.

How do I convert HEIC photos from my iPhone to JPG?

Open the Image Converter, select JPG as the output format, and drop all your HEIC files at once. Each converts in 1-2 seconds. No iPhone settings change needed — convert after transfer instead.

Can I convert images without installing software?

Yes. Browser-based converters work on any device with a modern browser — Windows, Mac, Chromebook, phone, or tablet. No download, no install, no account required.

What is the difference between HEIC and JPG?

HEIC (Apple's format) produces similar quality to JPG at 40-50% smaller file size. The downside: many systems don't support HEIC — MLS, WordPress, older email clients, Windows Photo Viewer. Converting to JPG ensures universal compatibility.

Should I convert website images to WebP?

Yes. WebP is 25-35% smaller than JPG at the same quality and is supported by 96%+ of browsers. Converting your site's images from JPG/PNG to WebP reduces page load time and bandwidth costs. Only keep JPG fallbacks if you need to support very old browsers.

Can I batch convert on my phone?

Yes, but processing speed is slower than a laptop. For batches under 50 images, phones handle it fine. For 100+ images, a laptop or desktop is significantly faster due to more processing power and memory.

Do converted images keep their EXIF metadata?

By default, most converters strip EXIF data during format conversion. If you need to preserve metadata (photographers tracking camera settings), check the converter's settings. If you want to ensure metadata is removed for privacy, use the EXIF Stripper after conversion.

How to Batch Convert Hundreds of Images Between Formats — Free, No Upload

Last updated: March 20268 min readImage Tools

The Problem: 200 HEIC Photos From Your iPhone

You shot 200 photos on your iPhone for a real estate listing. They are all in HEIC format. Your MLS system only accepts JPG. Most online converters cap you at 10-20 images per batch, require an account, and upload your client's property photos to their servers.

Here is how to convert all 200 in minutes — entirely in your browser, no upload to any server, no daily limit.

Step-by-Step: Batch Convert Any Format

Open the Image Converter
Select your target format (JPG, PNG, WebP, or others)
Drop all your images at once — the tool accepts multiple files
Each image converts instantly in your browser
Download them individually or all at once

Because everything runs in your browser, there is no server queue. 200 images on a modern laptop takes 1-2 minutes. Your files never leave your device.

Which Format Should You Convert To?

Converting From	Best Target	Size Change	When to Do This
HEIC (iPhone photos)	JPG	Similar or slightly larger	Sharing with anyone, uploading to systems that don't accept HEIC
PNG (screenshots, graphics)	JPG	3-5× smaller	Photos saved as PNG by mistake, need smaller files for email
JPG (photos)	WebP	25-35% smaller	Website images — WebP is supported by all modern browsers
WebP (downloaded from web)	JPG or PNG	Slightly larger	Need universal compatibility for email, documents, printing
BMP/TIFF (legacy scans)	JPG or PNG	5-10× smaller	Archiving old scans in modern formats

Real Workflows That Need Batch Conversion

Real estate photography — HEIC from iPhone → JPG for MLS upload. 50-100 photos per listing.
E-commerce product photos — Camera RAW/TIFF → JPG for product pages, then → WebP for site speed optimization.
Website migration — converting all site images from JPG/PNG to WebP saves 25-35% bandwidth. For a site with 500 images, that is significant.
Social media content library — standardizing mixed formats (HEIC, PNG, WebP) to JPG for consistent editing workflow.
Legal document processing — converting scanned TIFFs to PNG for cleaner OCR processing with the Image to Text tool.

Optimizing After Conversion

Format conversion alone does not always produce the smallest files. For maximum efficiency, add these steps after converting:

Resize oversized images — a 4000px-wide photo going on a website only needs 1600px. Use the Image Resizer to cut dimensions in half = 75% file size reduction.
Compress the converted files — JPG at 85% quality looks identical to the human eye but is 60-80% smaller than 100% quality. Use the Image Compressor.
Strip metadata — EXIF data (GPS, camera settings) adds 50-200KB per photo. The EXIF Stripper removes it. Essential for privacy when sharing real estate or personal photos.

The full pipeline — convert → resize → compress → strip metadata — can reduce a set of 200 iPhone photos from 1.5GB to under 100MB.

Why "No Upload" Matters for Batch Processing

When you process 200 images through a server-based tool, you are:

Uploading potentially gigabytes of data over your internet connection
Waiting in a processing queue behind other users
Trusting a third party with your images (client photos, product shots, personal pictures)
Subject to daily limits that cap you at 10-50 images

Browser-based processing eliminates all of these problems. Your images stay on your device. Processing speed depends on your computer, not a server queue. No limit on the number of files. The only requirement is a modern browser — Chrome, Firefox, Safari, or Edge.

Try Image Converter — free, private, unlimited.

Open Image Converter