# Resizo — Overview

Resizo is a free, browser-based image resizer at [resizo.in](https://www.resizo.in/). It resizes, converts, crops, compresses, watermarks, and renames images entirely inside the user's browser using the HTML5 Canvas API. No images are uploaded to any server. No account, no sign-up, no watermarks, no file-size cap imposed by a backend.

## Who it is for

- **Social media managers and creators** who need exact platform dimensions for Instagram, YouTube, Facebook, X/Twitter, LinkedIn, WhatsApp, Pinterest, and TikTok.
- **E-commerce sellers** preparing product images for Shopify, WooCommerce, Amazon, and Etsy listings.
- **Bloggers, writers, and SEO teams** compressing images for Core Web Vitals (LCP, INP) without losing visible quality.
- **Designers and developers** doing bulk format conversion (JPG ↔ PNG ↔ WebP) and batch crop to fixed aspect ratios.
- **Anyone with sensitive images** — IDs, medical scans, screenshots of private chats, internal documents — that should never leave their device.

## Why Resizo is different from server-upload tools

Most "online image resizers" (TinyPNG, iLoveIMG, ResizePixel, Img2Go, and similar) upload the user's file to a remote server, process it there, then send a download link back. That means:

- The image leaves the user's device and is briefly stored on third-party infrastructure.
- Privacy depends entirely on the operator's retention and logging policy.
- Upload + download time often exceeds the actual resize time, especially on mobile networks.
- Free tiers cap file size, batch count, or number of operations per day.

Resizo's architecture is the inverse. The page loads once (HTML, CSS, JS — under ~150 KB). After that, every operation runs locally in the browser tab. The user can disconnect from the internet mid-edit and Resizo keeps working. There is no upload bandwidth, no queue, no server quota.

## What it produces

- Output formats: **JPG, PNG, WebP** (input also accepts GIF).
- Output controls: pixel dimensions, percentage scaling, lock aspect ratio, quality slider (1–100), target file size, DPI.
- Batch mode produces a single ZIP for download — also built fully in-browser.

Resizo is maintained as a static site on Vercel. No tracking pixels, no third-party analytics that transmit image data.