Resize Image
Resize images to exact dimensions online for free. Custom sizes or social media presets for Instagram, Twitter, LinkedIn, and more. Files never leave your browser.
Drop your image here to resize
JPG, PNG, WebP, BMP, GIF • Max 10 MB
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How to Resize Image Online
Upload your image by dragging it into the drop zone or clicking to browse.
Enter custom dimensions or select a social media preset.
Toggle the aspect ratio lock to control proportions.
Click 'Resize' to process your image.
Download your resized image — it's ready to use.
Resize Image — Frequently Asked Questions
Related Tools
About Resize Image
Why Resize Images?
Every platform has specific image size requirements. An Instagram post needs to be 1080×1080, a LinkedIn banner is 1584×396, and a YouTube thumbnail is 1280×720. Using the wrong dimensions means your images get cropped, stretched, or padded by the platform — often with poor results.
According to Hootsuite (2025), optimal image dimensions vary by platform: Instagram feed posts require 1080×1350px, Facebook uses 1080×1350px, X (Twitter) recommends 1600×900px, and LinkedIn performs best at 1200×1200px. Posts with correctly sized visuals receive up to 2.3x more engagement (WebFX, 2025).
Common scenarios where you need to resize images:
- Social media posts: Each platform has unique size requirements. Using the right dimensions ensures your images display perfectly without automatic cropping.
- Website optimization: A 4000×3000 photo displayed at 800×600 wastes bandwidth. Resizing to the display size dramatically reduces page load time.
- Email and messaging: Large images are slow to send and may be rejected. Resizing to reasonable dimensions makes sharing instant.
- Print preparation: Print requires specific dimensions and DPI. Resizing ensures your photos fit the intended print size.
- App development: Mobile apps need images at specific sizes for different screen densities (1x, 2x, 3x).
How PDFJolt Resizes Images Differently
Most online image resizers (Adobe Express, Canva, PicResize) upload your photos to their servers. Your headshots, ID photos, and personal images travel across the internet to be processed on someone else's infrastructure.
PDFJolt resizes images entirely in your browser using the HTML Canvas API with high-quality resampling. When you drop an image into PDFJolt, it stays on your device throughout the entire process. No upload, no cloud processing, no privacy risk.
Social Media Image Size Guide (2026)
| Platform | Image Type | Dimensions | Aspect Ratio |
|---|---|---|---|
| Square Post | 1080×1080 | 1:1 | |
| Story / Reel | 1080×1920 | 9:16 | |
| Twitter / X | Post Image | 1200×675 | 16:9 |
| Banner | 1584×396 | 4:1 | |
| Cover Photo | 820×312 | ~2.6:1 | |
| YouTube | Thumbnail | 1280×720 | 16:9 |
PDFJolt vs. Other Image Resizers
| Feature | PDFJolt | Adobe Express | PicResize | Simple Image Resizer |
|---|---|---|---|---|
| Price | Free (5/day) | Free (limited) | Free | Free |
| Privacy | Client-side | Cloud upload | Cloud upload | Cloud upload |
| Social presets | 6 presets | Many | Basic | None |
| Aspect ratio lock | Yes | Yes | Yes | Yes |
| Account required | No | Yes | No | No |
| Works offline | Yes | No | No | No |
Tips for Best Results
- Always keep aspect ratio locked unless you specifically need to crop or stretch. Unlocked resizing distorts your image.
- Downscale, don't upscale. Enlarging a small image beyond its original dimensions produces blurry results. If you need a larger image, start with a higher-resolution source.
- Compress after resizing. Resizing first, then compressing with our Image Compressor, produces the smallest possible files with the best quality.
- Use presets for consistency. Social media presets ensure your images display perfectly on every platform without manual calculation.