Free Online Image Resizer — 100% Private, No Upload Required
Our free online image resizer lets you resize any photo or image instantly, directly in your web browser. Unlike most online image resizers that upload your files to their servers (raising privacy and security concerns), our tool processes everything client-side using JavaScript — your images never leave your device. This makes it the safest way to resize sensitive photos, personal images, business documents, and confidential graphics.
Whether you need to resize an image for Instagram, create the perfect Facebook cover photo, prepare a YouTube thumbnail, reduce an image file size for email, or format a passport photo to exact specifications, our tool handles it all. Simply drag and drop your image, set your desired dimensions, and download the resized result. Supports JPEG, PNG, WebP, GIF, and more.
Social Media Image Size Guide (2025)
Every social media platform has specific recommended image dimensions. Using the wrong size results in cropping, stretching, or blurry images. Here is the definitive guide to every platform's image requirements:
| Platform | Image Type | Recommended Size (px) | Aspect Ratio |
|---|---|---|---|
| Square Post | 1080 × 1080 | 1:1 | |
| Portrait Post | 1080 × 1350 | 4:5 | |
| Landscape Post | 1080 × 566 | 1.91:1 | |
| Story / Reel | 1080 × 1920 | 9:16 | |
| Profile Picture | 320 × 320 | 1:1 | |
| Post Image | 1200 × 630 | 1.91:1 | |
| Cover Photo | 820 × 312 | 2.63:1 | |
| Profile Picture | 180 × 180 | 1:1 | |
| Event Cover | 1200 × 628 | 1.91:1 | |
| Twitter / X | In-Stream Image | 1600 × 900 | 16:9 |
| Twitter / X | Header Photo | 1500 × 500 | 3:1 |
| Twitter / X | Profile Picture | 400 × 400 | 1:1 |
| Post Image | 1200 × 627 | 1.91:1 | |
| Cover Photo | 1128 × 191 | 5.91:1 | |
| Profile Picture | 400 × 400 | 1:1 | |
| YouTube | Thumbnail | 1280 × 720 | 16:9 |
| YouTube | Channel Art | 2560 × 1440 | 16:9 |
| YouTube | Profile Picture | 800 × 800 | 1:1 |
| Standard Pin | 1000 × 1500 | 2:3 | |
| Profile Picture | 165 × 165 | 1:1 | |
| TikTok | Video Thumbnail | 1080 × 1920 | 9:16 |
| TikTok | Profile Picture | 200 × 200 | 1:1 |
| Threads | Post Image | 1080 × 1080 | 1:1 |
Standard Print & Document Image Sizes
| Print Size | Pixel Dimensions (300 DPI) | Common Use |
|---|---|---|
| Wallet (2" × 3") | 600 × 900 px | Wallet photos, small prints |
| 4" × 6" | 1200 × 1800 px | Standard photo print |
| 5" × 7" | 1500 × 2100 px | Greeting cards, frames |
| 8" × 10" | 2400 × 3000 px | Portrait prints, frames |
| 8.5" × 11" (Letter) | 2550 × 3300 px | Documents, flyers, resumes |
| 11" × 14" | 3300 × 4200 px | Large photo prints |
| 11" × 17" (Tabloid) | 3300 × 5100 px | Posters, large documents |
| 16" × 20" | 4800 × 6000 px | Gallery prints, wall art |
| 24" × 36" | 7200 × 10800 px | Large posters, banners |
| Passport Photo (2" × 2") | 600 × 600 px | US passport, visa applications |
| ID Photo (35mm × 45mm) | 413 × 531 px | European ID, visa photos |
| A4 (8.27" × 11.69") | 2480 × 3508 px | International standard documents |
| A3 (11.69" × 16.54") | 3508 × 4961 px | Large documents, charts |
Image Format Comparison: When to Use Each
| Format | Best For | Transparency | Animation | Typical File Size | Quality |
|---|---|---|---|---|---|
| JPEG / JPG | Photos, complex images | No | No | Small-Medium | Lossy (adjustable) |
| PNG | Graphics, logos, screenshots | Yes | No | Medium-Large | Lossless |
| WebP | Web images (Google format) | Yes | Yes | Small | Both lossy & lossless |
| GIF | Simple animations, memes | Yes (1-bit) | Yes | Varies | 256 colors max |
| SVG | Icons, logos, vector graphics | Yes | Yes | Very Small | Infinite (vector) |
| AVIF | Modern web images | Yes | Yes | Very Small | Superior compression |
| HEIC/HEIF | iPhone photos | No | No | Small | High quality |
| BMP | Legacy Windows images | No | No | Very Large | Lossless (uncompressed) |
| TIFF | Print, professional photography | Yes | No | Very Large | Lossless |
Frequently Asked Questions
Are my images uploaded to any server?▼
No! Our image resizer processes everything directly in your browser using client-side JavaScript. Your images never leave your device. We do not upload, store, track, or have any access to your photos. You can verify this by checking your browser's network tab — no image data is transmitted. This makes our tool ideal for sensitive photos and confidential images.
How do I resize an image without losing quality?▼
When making images smaller (downscaling), quality loss is minimal with good algorithms. When making images larger (upscaling), some quality loss is inevitable. To minimize quality loss: (1) Start with the highest resolution original, (2) Use PNG format for graphics and WebP for photos, (3) Resize proportionally (maintain aspect ratio), (4) Avoid resizing more than 2x larger than the original.
What is the difference between resizing and compressing?▼
Resizing changes the pixel dimensions (e.g., from 4000×3000 to 1920×1080). Compressing reduces the file size without changing dimensions by applying lossy compression (reducing quality slightly to save space). Often you want both — resize to the needed dimensions AND compress for optimal file size.
What image size should I use for Instagram?▼
For Instagram feed posts, use 1080×1080 (square), 1080×1350 (portrait, recommended for maximum visibility), or 1080×566 (landscape). For Instagram Stories and Reels, use 1080×1920. For profile pictures, 320×320 minimum. Portrait (4:5) format gets the most screen space in the feed, making it ideal for engagement.
How do I make a passport photo at home?▼
For a US passport photo: resize to 2"×2" (600×600 pixels at 300 DPI). The photo must have a white background, the face should occupy 50-69% of the frame, and the image must be recent (within 6 months). European passport/visa photos are typically 35mm×45mm (413×531 pixels at 300 DPI). Use our resizer to get the exact dimensions needed.
What is DPI and why does it matter for printing?▼
DPI (Dots Per Inch) measures print resolution. 72 DPI is standard for screens/web. 300 DPI is the minimum for high-quality prints. Higher DPI means sharper printed images. To calculate the pixel dimensions needed for a specific print size: multiply the print dimension in inches by the DPI. For example, an 8"×10" print at 300 DPI needs 2400×3000 pixels.