Easy Bulk GIF Optimizer

Create amazing GIFs from videos and images • Optimize existing GIFs

A simple Windows application for bulk GIF creation and optimization.

Also available for download here too: https://reactorcore.itch.io/easy-bulk-gif-optimizer

What Does This Do?

🎬 Mode 1: Video → GIF

Convert all videos in a folder to high-quality GIFs in one click.

Works with: MP4, AVI, MOV, MKV, WebM files
Creates one GIF per video
Bonus Feature: Extracts individual frames from videos
- Enable "Keep temp files" checkbox to preserve extracted frames
- Frames are saved as PNG files in a temp folder
- Great for creating thumbnails, sprite sheets, or manual editing
- Each video gets its own numbered frame sequence

🖼️ Mode 2: Images → GIF

Turn image sequences into animated GIFs automatically.

Works with: PNG, JPG, JPEG, BMP files
Smart grouping: Groups images by base name, removing numbers
Supported numbering patterns:
- Underscore: animation_001.png, animation_002.png → animation.gif
- Dash: frame-01.png, frame-02.png → frame.gif
- Parentheses: scene (1).png, scene (2).png → scene.gif
- Space: clip 001.png, clip 002.png → clip.gif
Images without numbers become individual GIFs

⚡ Mode 3: Optimize GIF

Make existing GIFs smaller without losing quality.

Typically 20-50% smaller files
Better compression than original

Requirements

For the application:

Windows 10 or later

For Mode 1 only (Video → GIF):

FFmpeg must be installed
Get it here: https://reactorcore.itch.io/ffmpeg-to-path-installer
(This installer automatically sets up FFmpeg for you)

How to Use

Simple 7-Step Workflow:

Pick a mode - Video → GIF, Images → GIF, or Optimize GIF
Choose input folder - Where your source files are
Choose output folder - Where to save the GIFs
Adjust settings - Quality, size, speed (or use defaults)
Generate test file - Process just the first file to preview
Click "Open" next to Output Folder to view your test
Process all files - When happy with the test, process everything

Tip: Click the "Help" button in the app to open this guide anytime!

Settings Guide

Quality Settings (Three Types)

Quality (1-100) - Overall encoder quality

Controls the main encoding quality level
Higher = better visual quality but bigger files
Web use: 60-70
High quality: 80-90
Recommended starting point: 70

Lossy Quality (1-100) - Compression aggressiveness

Controls how much the image is compressed
Lower = smaller files but more artifacts
Higher = larger files but cleaner image
Default: 80 (good balance)
Smaller files: 60-70
Best quality: 85-95
This has the biggest impact on file size

Motion Quality (1-100) - Motion handling quality

Controls how well motion/animation is preserved
Higher = smoother motion but larger files
Lower = choppier motion but smaller files
Default: 80
Important for fast-moving animations

Quick Summary:

Want smaller files? Lower Lossy Quality
Want better image quality? Raise Quality
Want smoother motion? Raise Motion Quality

Other Settings

Width & Height - Output size in pixels (0 = keep original)

Web use: 640-800 width
Full quality: 0 (original size)

FPS - Frames per second (how smooth the animation is)

Normal: 15-20
Smooth motion: 25-30

Tip: Use the "Reset to Defaults" button to start over. Default settings (Quality: 70, Lossy: 80, Motion: 80, Width: 320, FPS: 20) work well for most cases.

Smart Features

Automatic Skip

Already processed a file? The app automatically skips it next time. Safe to:

Re-run after errors
Resume interrupted batches
Add new files to the same folder

Test Before Processing

Always generate a test file first! This lets you:

Preview results before processing hundreds of files
Adjust settings to get exactly what you want
Save time by avoiding re-processing

Detailed Logs

Check log.txt in your output folder to see:

What was processed
What was skipped
Any errors that occurred

Tips

For best quality:

Use high-quality source files
Set Quality to 80-90
Keep Width at 0 (original size)

For smallest file size:

Set Quality to 50-60
Set Width to 480-640
Lower FPS to 10-15

For web use:

Quality: 70, Width: 640, FPS: 15
Try to keep under 5MB per GIF

Working with image sequences (Mode 2):

Name files with numbers in these formats: frame_001.png, frame-01.png, frame (1).png, or frame 001.png
All images with the same base name (before the number) will be grouped into one GIF
Leading zeroes are not required - file_1.png, file_2.png works just as well as file_001.png, file_002.png
Mixing formats like file_021.png and file_22.png will work but is not recommended for consistency
Generate a test file first to verify grouping worked correctly
Check the file count display after selecting input folder to see how many images were found

Extracting frames from videos (Mode 1):

Enable "Keep temp files" checkbox to preserve extracted video frames
Find frames in a temp_videoname folder inside your output directory
Frames are saved as high-quality PNG files at your video's native resolution
Perfect for creating video thumbnails, contact sheets, or picking specific frames
You can then use Mode 2 to turn selected frames back into a custom GIF
Tip: Process a video, keep the frames, delete unwanted ones, then use Mode 2 on the remaining frames for precise control

Troubleshooting

"FFmpeg not found" error

Only needed for Mode 1 (Video → GIF)
Get it here: https://reactorcore.itch.io/ffmpeg-to-path-installer

"No files found" error

Make sure input folder has the right file types
Mode 1: Video files (.mp4, .avi, .mov, etc.)
Mode 2: Image files (.png, .jpg, .bmp)
Mode 3: GIF files (.gif)

"No groups detected" error (Mode 2)

Image files need numbering in the filename
Supported patterns: file_001.png, file-01.png, file (1).png, file 001.png
The number must be at the END of the filename (before the extension)
Make sure at least 2 images share the same base name

Processing is slow

This is normal - high-quality GIF creation takes time
Expect 10-30 seconds per video/group
Lower the quality settings if you need faster results

Output file is too big

Lower the Quality and Lossy Quality settings
Reduce Width to 480-640
Lower FPS to 10-15
Run the result through Mode 3 to compress further

File Output

Mode 1: Creates video_name.gif (matches input filename)

Example: myvideo.mp4 → myvideo.gif

Mode 2: Creates group_name.gif (base name without numbers)

Example: animation_001.png, animation_002.png → animation.gif

Mode 3: Creates filename_optim_[quality]q_[fps]fps.gif (includes settings in filename)

Example: mygif.gif with Quality=70, FPS=20 → mygif_optim_70q_20fps.gif
This makes it easy to compare different optimization settings

Test files: Saved as test_*.gif in output folder (same naming pattern as above)

Logs: Check log.txt in output folder for details

Credits

Created by Reactorcore (2026)

https://linktr.ee/reactorcore

Powered by:

gifski - The world's best GIF encoder by Kornel Lesiński
FFmpeg - Video processing by FFmpeg team

Support

Having issues?

Check log.txt in your output folder for error details
For Mode 1: Make sure FFmpeg is installed
Try processing with default settings first
Generate a test file to preview before bulk processing

Enjoy making beautiful GIFs! 🎬✨

ReactorcoreGames/Easy-Bulk-GIF-Optimizer