Which has better quality — JPG or PNG?

Neither is objectively 'better quality' — they serve different purposes. JPG uses lossy compression optimised for photographs: it discards fine colour detail that the human eye barely perceives, achieving small file sizes with visually excellent results for real-world images. PNG uses lossless compression that preserves every pixel exactly, making it better for graphics, text, logos, and images where sharp edges must remain crisp. Converting a JPG to PNG does not improve quality — it stores already-compressed data in a lossless container, resulting in a larger file at identical visual quality. For photographic content, a high-quality JPG and a PNG of the same image look identical on screen. The practical decision is about transparency (PNG supports it, JPG does not) and file size (JPG is smaller for photos).

What is WebP, and do all browsers support it? What about AVIF?

WebP is a modern image format developed by Google, now universally supported. It produces files 25–35% smaller than JPG at equivalent visual quality, while also supporting transparency (like PNG) and animation (like GIF). As of 2026, over 96% of global browsers support WebP — including all versions of Chrome, Firefox, Safari (since 2020), and Edge. WebP is the recommended format for all web images. AVIF is the next generation beyond WebP, developed by the Alliance for Open Media. AVIF achieves compression roughly 50% better than JPG while maintaining higher visual quality than WebP at very small file sizes. Browser support for AVIF reached approximately 90% as of 2025. For cutting-edge web performance, AVIF is emerging as the optimal format — the smallest possible file sizes on modern browsers.

How do I batch convert HEIC to JPG — especially for large batches of 200+ photos?

Upload all your HEIC files at once by dragging your iPhone photo folder onto the upload area, or by clicking Select Images and pressing Ctrl+A (Windows) / Cmd+A (Mac) to select all. Choose JPG as the output format, then click Convert. The tool processes all files simultaneously with no file count limit — 200, 500, or 2000+ HEIC files are all handled in a single operation. All processing is local (no upload to any server), and the converted JPG files download as a ZIP archive with original filenames preserved. For batches of 500+ files, close other browser tabs first to maximise available memory.

Can I convert 100+ images in a single batch?

Yes — there is no file count limit. Unlike tools that cap batch conversion at 20 or 100 images, this converter processes unlimited files because all conversion runs locally in your browser using your device's processor rather than a server. The practical limit is your device's available RAM: a device with 8GB RAM handles 500+ images comfortably; 16GB+ handles 2000+ files. For very large batches (1000+ files), split into two sessions of 500 for optimal speed on devices with less than 16GB RAM. The output ZIP preserves all original filenames with the new file extension.

How is this different from Filator or Convertio?

Filator caps free batch conversion at 100 images and requires an account for larger batches. Convertio limits free users to 10 conversions per day and charges per conversion minute for larger jobs. CloudConvert operates on a credit system — bulk jobs cost real money. This converter has no file count limit, no daily cap, and no account requirement because all processing runs locally in your browser using your device's CPU. There is no server to pay for, so there is no reason to impose limits. The trade-off: server-based tools like Convertio can handle exotic formats that require server-side software; this tool covers the most common formats (JPG, PNG, WebP, HEIC, AVIF, BMP, GIF) without any of those restrictions.

After converting, my file got larger instead of smaller. Is that normal?

Yes — some conversions produce larger files, and this is expected behavior, not an error. The most common case: converting JPG to PNG. PNG is a lossless format that must store the image data without discarding anything; when it takes a JPG as input, it encodes the image (including all JPEG compression artifacts) in a lossless container, which is inherently larger than the original JPG. Conversions that should reduce file size: PNG to JPG (drops lossless requirement and transparency), anything to WebP (25–35% smaller than JPG equivalent), any large BMP or TIFF to JPG. If you need to reduce file size after format conversion, use the Image Compressor after converting.

Does converting between formats reduce image quality?

It depends on the conversion direction. Lossy-to-lossless (JPG → PNG): no quality loss, but the file is larger and existing compression artifacts are preserved exactly. Lossless-to-lossy (PNG → JPG or PNG → WebP): slight quality reduction due to compression, but at standard quality settings (80–90%), the visual difference is imperceptible for photographic content. Lossy-to-lossy (JPG → WebP): WebP re-encodes the image, potentially introducing minor additional artifacts, but produces a noticeably smaller file. For critical quality applications, always keep your original lossless source files and convert copies only.

Can I convert images while keeping the transparent background?

Transparency is preserved when converting between formats that support it. Converting PNG (transparent) to WebP: transparency fully preserved. Converting WebP (transparent) to PNG: transparency fully preserved. Converting PNG (transparent) to JPG: transparency is LOST — transparent areas are filled with white because JPG does not support transparency. If you need to convert a transparent PNG to JPG and want a specific background colour (black, grey, custom brand colour), use the dedicated Image to JPG Converter which offers a background fill colour option before output.

Is EXIF data (camera settings, GPS, date) kept after conversion?

For JPG-to-JPG re-encoding and most conversions between lossy formats, EXIF data is preserved by default — camera model, exposure settings, GPS coordinates, and date/time metadata carry through the conversion. For conversions to PNG: PNG uses a different metadata standard (tEXt/zTXt chunks instead of EXIF), so EXIF data may be partially converted or lost. For conversions to WebP: EXIF data is supported in WebP containers and is preserved in most conversions. If EXIF data preservation is critical for your workflow (professional photography, legal documentation, geotagged archives), use the EXIF Viewer to check metadata before and after conversion.

Bulk Image Converter Online — Batch Convert JPG, PNG, WebP & HEIC Free, No Upload

Image Format Conversion Matrix

Convert FROM → TO ↓	JPG	PNG	WebP	HEIC	BMP / GIF
JPG	— (Same format)	✅ Lossless conversion, file size increases, no transparent background added	✅ File size ~30% smaller, quality nearly identical	❌ Not common; keep as JPG	✅ BMP: file size increases. GIF: loses animation
PNG	⚠️ Lossy conversion, transparent background → white, file size decreases	— (Same format)	✅ Transparency preserved, file size ~25% smaller	❌ HEIC not commonly used; keep as PNG	✅ BMP→PNG: size decreases. GIF→PNG: loses animation
WebP	✅ Lossy conversion, file size ~25–35% smaller, quality close to original	✅ Transparency preserved, file size ~25–35% smaller	— (Same format)	✅ For iPhone photos: significantly reduces file size	✅ GIF→WebP: supports animation
HEIC	⚠️ Not recommended; poor compatibility. Convert to JPG instead.	⚠️ Not recommended; poor compatibility	⚠️ Not recommended; poor compatibility	— (Same format)	⚠️ Not recommended
BMP / GIF	—	⚠️ GIF→PNG: loses animation	✅ BMP/GIF→WebP: significantly reduces file size	—	— (Same format)

Image Format Characteristics Quick Reference

Format	Best For	Transparency	Animation	Typical Size vs JPG
JPG / JPEG	Photos, real images — maximum compatibility	❌	❌	Baseline (1×)
PNG	Graphics, logos, screenshots, transparent backgrounds	✅	❌	1.5–3× larger than JPG
WebP	Web images, modern browsers	✅	✅	0.65–0.75× vs JPG
HEIC	iPhone/Apple device storage	✅	❌	~0.5× vs JPG
AVIF	Next-gen web format, ~50% smaller than JPG	✅	✅	~0.5× vs JPG
BMP	Legacy Windows format, uncompressed, very large	❌	❌	10–20× larger than JPG
GIF	Short animations — limited to 256 colors, not suitable for photos	❌	✅	Use for animations only

Image Format Guide: What Actually Happens When You Convert Between JPG, PNG, WebP, and HEIC

Not all image format conversions are equal. Some conversions are lossless (the image quality is mathematically identical before and after), while others are lossy (some pixel data is discarded to achieve a smaller file). Understanding which is which prevents unpleasant surprises — like discovering your PNG's transparent background became a white rectangle after converting to JPG.

The core rule: Converting from a lossless format (PNG) to a lossy format (JPG, WebP) always involves some quality trade-off, even if imperceptible. Converting from a lossy format (JPG) to a lossless format (PNG) does not recover lost quality — you simply store already-compressed data in a lossless container. The result is a larger file, not a higher-quality image.

Key conversions explained:

JPG → PNG: No quality improvement. The file will be 1.5–3× larger. Useful when you need transparency support or a tool requires PNG input. Need PNG with transparency options? Use Image to PNG Converter
PNG → JPG: Lossy conversion — subtle quality reduction, but file size drops 50–70%. Transparent areas become white.
Any format → WebP: Typically 25–35% smaller than JPG at equivalent visual quality. Supports transparency and animation. Over 96% of browsers support WebP as of 2026. Converting for web performance? Use Image to WebP Converter for WebP-specific optimisation
HEIC → JPG: Most common iPhone-to-Windows compatibility conversion. Quality is excellent; file size increases slightly (HEIC is more efficient than JPG).
JPG or PNG → HEIC: Not recommended unless you need HEIC specifically for Apple ecosystem.
Converting everything to JPG? Use Image to JPG Converter for JPG-specific quality settings

Batch Convert 200, 500, or 2000+ Images at Once — No File Count Limit

Most online image converters have a hidden ceiling. Filator caps batch conversion at 100 images. Convertio limits free users to smaller batches. CloudConvert charges per conversion minute. If you need to batch convert 200+ HEIC photos from an iPhone, a folder of 500 product images, or an entire library of 2000 WebP files, most tools will stop you, slow down, or ask for payment partway through.

BulkPicTools has no file count limit. Because all processing runs locally in your browser using your device's CPU and GPU — not on a server — there is no server cost per file and therefore no reason to impose a cap. The practical limit is your device's available memory: a modern laptop with 8GB RAM can comfortably process 500–1000 images in a single batch; a device with 16GB+ can handle 2000+ files.

Batch Conversion Steps
Step	Action
1. Drag Your Entire Folder	Drag your entire image folder onto the upload area, or click Select Images and select all files with Ctrl+A (Windows) or Cmd+A (Mac). Mixed formats are supported — you can upload HEIC, JPG, PNG, and WebP files simultaneously and convert them all to the same output format in one operation.
2. Choose One Output Format	Select your target format from the dropdown. For maximum compatibility: choose JPG. For web performance: choose WebP. For preserving transparency across the batch: choose PNG. One output format for the entire batch is faster than per-file settings.
3. Convert and Download as ZIP	Click Convert. The tool processes all files simultaneously using your browser's local computing power — no server queue. When done, click Download All as ZIP. The ZIP preserves original filenames with the new extension.

Tips for very large batches (500+ files):

Close other browser tabs before processing to free up RAM
For 1000+ files, split into two batches of 500 on devices with less than 16GB RAM
HEIC decoding is more CPU-intensive than JPG — allow more time for large HEIC batches
The ZIP download preserves original filenames: photo_001.heic becomes photo_001.jpg automatically
Just need HEIC to JPG? Use the dedicated HEIC to JPG Converter — optimized specifically for iPhone photos

JPG vs PNG vs WebP vs HEIC: Which Image Format Should You Convert To?

Choosing the wrong output format is the most common image conversion mistake. Here is the decision framework used by web developers, photographers, and designers:

Use JPG when:

You need maximum compatibility — every device, browser, software, and platform from 1995 to 2026 supports JPG without exception.
You are sharing photos with people who may be on older devices or using basic photo viewers.
You are uploading to a platform that specifies JPG (government portals, most HR systems).
File size matters and perfect pixel-level quality is not required. Converting everything to JPG? Use Image to JPG Converter for JPG-specific quality settings

Use PNG when:

Your image has a transparent background — logos, icons, stickers, product cutouts must use PNG (or WebP).
Your image contains text, sharp edges, or flat colour areas where JPG's block artifacts would be visible.
You need lossless quality for further editing. Need PNG with transparency options? Use Image to PNG Converter

Use WebP when:

You are optimising images for a website — WebP loads 25–35% faster than JPG at equivalent visual quality, directly improving page speed and SEO.
You need both transparency and animation in a single modern format.
Your target audience uses modern browsers — over 96% of global browser usage supports WebP as of 2026.

Use HEIC when:

You are storing photos on Apple devices only — your iPhone photo library uses roughly half the storage of equivalent JPG photos.
You are NOT sharing photos with Windows or Android users — convert HEIC to JPG first for sharing.

The short version: Photos for sharing → JPG. Web images → WebP. Logos and transparency → PNG. Apple device storage → HEIC. If in doubt, JPG works everywhere.

Bulk Convert JPG to PNG, PNG to JPG, and Between Any Format — Complete Format Pair Guide

Different tasks call for different format conversions. This guide covers every common bulk conversion pair, what to expect from each, and when to use the dedicated single-format converter instead.

Bulk Convert JPG to PNG

Converting JPG to PNG in bulk preserves every pixel exactly — but it will not improve quality. A JPG's existing compression artifacts are stored losslessly in the PNG container, so the output is pixel-identical to the input, just larger. The file size typically increases 1.5–3×. Do this when: a downstream tool requires PNG input, you need transparency support, or you are preparing source files for further editing. For a dedicated workflow, use Image to PNG Converter.

Bulk Convert PNG to JPG

This is the most common size-reduction conversion. PNG → JPG drops the lossless requirement, producing files 50–70% smaller. Any transparent areas become white — if your PNGs have transparency, decide whether white fill is acceptable before running the batch. At quality 85–90%, the visual difference is imperceptible for photographic content. For bulk PNG to JPG with a custom background fill colour, use Image to JPG Converter.

Bulk Convert to WebP (from JPG, PNG, or HEIC)

Converting your image library to WebP in bulk is the single highest-impact step for web performance. WebP is 25–35% smaller than JPG at equivalent visual quality, supports transparency, and is supported by over 96% of browsers as of 2026. Upload any mix of JPG, PNG, or HEIC files and convert them all to WebP in one operation. For WebP-specific quality tuning, use Image to WebP Converter.

Bulk Convert HEIC to JPG (iPhone Photos)

HEIC is Apple's default photo format since iOS 11 — efficient for storage, but incompatible with most Windows software, Android devices, and older image viewers. Bulk converting HEIC to JPG in one batch is the fastest way to restore compatibility. Drag your entire iPhone photo export folder, select JPG as output, and convert. File size increases slightly because JPG is less efficient than HEIC, but the result opens everywhere. For HEIC-only batches, the dedicated HEIC to JPG Converter is faster.

Bulk Convert JPG or PNG to AVIF

AVIF is the next-generation format after WebP: roughly 50% smaller than JPG at equivalent visual quality. Browser support reached approximately 90% in 2025 and is growing. For cutting-edge web performance with maximum file size reduction, AVIF is the optimal output format — provided your target audience uses modern browsers. Use this converter to batch convert your existing JPG or PNG library to AVIF in a single pass.

When to use this converter vs. a dedicated format converter

Scenario	Use
Mixed formats in one batch (HEIC + JPG + PNG → JPG)	This page — Bulk Image Converter
HEIC-only batch, large iPhone export	HEIC to JPG Converter — faster for HEIC-only
Need custom background fill for PNG → JPG	Image to JPG Converter
WebP-specific quality tuning per file	Image to WebP Converter
PNG with transparency → PNG cleanup	Image to PNG Converter

Bulk Image Converter

Key Features of Bulk Image Converter

Universal Format Support

Mass Processing — No File Limit

No Upload Required

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