Image Resizer
Resize by pixels, percentage, or size presets (passport, ID photo, resume photo). Keeps aspect ratio, batch processing.
Click or drag images here
Upload multiple files · JPG · PNG · WebP · HEIC supported
🔒 All processing runs in your browser — files are never uploaded to a server.
🪪 Passport & ID photo sizes at a glance
ID photo size requirements vary by purpose. Pick one from the "Size presets" tab and it's automatically converted to pixels at 300DPI; if your photo's ratio doesn't match, a center crop fills the frame.
| Purpose | Size (cm) | Pixels (300DPI) |
|---|---|---|
| Passport photo | 3.5 × 4.5 | 413 × 531 |
| General ID photo | 3.5 × 4.5 | 413 × 531 |
| Resume photo | 3.0 × 4.0 | 354 × 472 |
| US visa photo | 2 × 2 inch | 600 × 600 |
📐 What's the relationship between DPI and pixels?
DPI (dots per inch) is print density. Printed photos typically use 300DPI. Printing a 3.5×4.5cm passport photo at 300DPI needs about 413×531 pixels (based on 1 inch = 2.54cm). 72–96DPI is fine for screen display only, but for print it's safest to match the 300DPI pixel size.
💡 Tips for resizing
- Shrinking barely affects quality, but enlarging a small photo makes it blurry. Start from the largest original you have.
- Fitting a mismatched ratio into a preset crops part of the photo — keep faces centered when shooting.
- For web uploads, pair resizing with compression for better results.
📱 SNS & web size presets
Beyond document sizes, ready-to-use SNS and web dimensions are included as presets.
| Preset | Pixels | Ratio |
|---|---|---|
| Instagram square | 1080 × 1080 | 1:1 |
| Instagram portrait | 1080 × 1350 | 4:5 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| KakaoTalk profile | 640 × 640 | 1:1 |
| Profile picture | 500 × 500 | 1:1 |
Guide: matching passport & ID photo size specs →
💬 Frequently Asked Questions
- Can I shrink an image while keeping its aspect ratio?
- Yes. Turn on "Keep aspect ratio" and it scales up or down within your width/height while preserving the original proportions.
- Can I resize by percentage?
- Yes. Use the "Percent" tab and adjust between 5–200% to scale relative to the original size.
- Does resizing hurt image quality?
- High-quality resampling minimizes quality loss. Shrinking preserves quality better than enlarging.
- Can I resize to passport or ID photo dimensions?
- Yes. Pick a preset — passport (3.5×4.5cm), resume, small ID, US visa, and more — from "Size presets" and it's converted to pixels at 300DPI. Mismatched ratios are center-cropped to fill the frame.
- What happens to quality when enlarging?
- Upscaling interpolates new pixels, so the image can look softer than the original. Prefer downscaling when quality matters.
- Do the document presets match official requirements?
- Presets follow common specs (e.g. 3.5×4.5 cm). If your submission specifies its own rules, check those first.
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