Resize Images Online — Free & Instant
Resize images to exact dimensions — fast, free, and private.
Images are resized locally in your browser whenever possible. If local processing isn't supported or fails, we automatically complete the job on our servers — no action required. Supports JPG, PNG, WebP, and AVIF. Platform presets, batch processing — no signup, no watermarks.
Why Use FastImageTools
Local-First Processing
Images are resized in your browser by default using WebAssembly. Automatic server fallback if needed.
Instant Results
See a dimension comparison before downloading. No signup or email required.
Completely Free
No watermarks, no file limits, no hidden fees. Professional-grade resizing at zero cost.
Platform Presets
One-click presets for Instagram, YouTube, Twitter, LinkedIn, print sizes, and more — always the right dimensions.
How to Resize Images
- 1
Upload Your Images
Drag and drop or browse your files. Batch upload supported — resize dozens of images at once.
- 2
Choose Dimensions or a Platform Preset
Pick a social media preset (Instagram, YouTube, Twitter), set custom dimensions, or scale by percentage. Aspect ratio lock and resampling options available.
- 3
Download Resized Images Instantly
Preview the before-and-after comparison, then download files individually or as a ZIP archive.
Browser-Based vs Cloud Resizing
FastImageTools (Local-First)
- Images stay on your device by default
- Instant processing — no upload wait
- Handles large files locally when possible
- Free with no usage caps
- Automatic server fallback if needed
Cloud-Based Tools
- —Files uploaded to third-party servers
- —Speed limited by upload and download
- —Typical 5–25 MB file size limit on free tiers
- —Often requires paid plans for batch or large files
- —Requires a stable internet connection
Example Result
Original
4000 × 3000 (3.8 MB)
camera-photo.jpg
Resized
1080 × 810 (680 KB)
Sharp — Lanczos resampling
Supported Image Formats
JPEG / JPG
Photos from cameras and phones. Resize without re-encoding quality loss.
PNG
Screenshots and UI graphics with transparency. Lossless resizing.
WebP
Modern web format — resize and keep the smaller file size advantage.
AVIF
Next-generation format. Resize for modern browsers with maximum compression.
GIF
Simple animations and graphics with limited color palettes.
BMP
Uncompressed bitmap — resize and convert to a modern format for savings.
Frequently Asked Questions
Will resizing my images reduce their quality?+−
Is it safe to resize images here?+−
What is the maximum file size I can resize?+−
Can I resize multiple images at once?+−
What platform presets are available?+−
What are the best image dimensions for social media?+−
How is browser-based resizing different from cloud tools?+−
Are my images uploaded to your servers?+−
Related Image Tools
Done resizing? These tools work great as a next step:
Compress Image
Reduce file size while keeping visual quality.
Convert to WebP
Switch to the modern WebP format for smaller files.
Crop Image
Fine-tune composition and remove unwanted areas.
Optimize for Web
All-in-one optimization: compress, resize, and convert.
Remove Background
AI-powered background removal for product photos.
Metadata Editor
View, edit, or strip EXIF and GPS data from images.