# Resizo — Features

## Core features

- **Resize by pixels or percentage** with optional aspect-ratio lock.
- **Format conversion** between JPG, PNG, and WebP (GIF accepted as input).
- **Quality slider (1–100)** for JPG and WebP output.
- **Target file size mode** — set a max KB and Resizo iterates quality to fit.
- **Crop tool** with fixed aspect ratios (1:1, 4:3, 16:9, 9:16) or freeform.
- **Watermark** with text or uploaded logo; control position, opacity, color, and rotation.
- **Batch processing** — drop hundreds of images, apply one operation, download a single ZIP. Runs in Web Workers, fully client-side.
- **Batch rename** with prefix + sequence numbering.
- **Social media presets** — one-click dimensions for every major platform.
- **DPI control** for print workflows (72 / 150 / 300).
- **EXIF handling** — orientation is respected; other metadata is stripped by default for privacy.
- **Dark mode**, RTL support, and nine localized interfaces (en, es, fr, de, pt, id, ar, ko, sw).
- **No upload, no sign-up, no watermarks, no quota.**

## Social media preset dimensions

### Instagram

| Preset | Dimensions (px) | Aspect |
| --- | --- | --- |
| Square post | 1080 × 1080 | 1:1 |
| Portrait post | 1080 × 1350 | 4:5 |
| Story / Reel | 1080 × 1920 | 9:16 |

### YouTube

| Preset | Dimensions (px) | Aspect |
| --- | --- | --- |
| Thumbnail | 1280 × 720 | 16:9 |
| Channel art / banner | 2560 × 1440 | 16:9 |
| Profile picture | 800 × 800 | 1:1 |

### Facebook (44 presets)

The dedicated Facebook tool includes 44 presets across profile, cover, feed, stories, reels, events, groups, ads, shop, marketplace, and messenger formats.

| Preset | Dimensions (px) | Aspect | Best for |
| --- | --- | --- | --- |
| Profile picture | 1080 × 1080 | 1:1 | Account avatar / circular display |
| Cover photo | 1640 × 624 | ~2.6:1 | Desktop profile and page banners |
| Feed landscape | 1200 × 630 | ~1.91:1 | Landscape posts and link previews |
| Story / Reels | 1080 × 1920 | 9:16 | Full-screen vertical placements |
| Feed ad landscape | 1200 × 628 | ~1.91:1 | Facebook feed ads |

Full reference: [Facebook Image Resizer Documentation](./resize-image-for-facebook.md) and [live tool](https://www.resizo.in/resize-image-for-facebook/).

### X / Twitter

| Preset | Dimensions (px) | Aspect |
| --- | --- | --- |
| Post image | 1200 × 675 | 16:9 |
| Header photo | 1500 × 500 | 3:1 |
| Profile picture | 400 × 400 | 1:1 |

All presets are applied on the client. Resizo never sees the image; the preset only sets the target canvas dimensions before re-encoding the file the user selected.